rigmesh: automatic rigging for part-based shape modeling...
TRANSCRIPT
![Page 1: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/1.jpg)
RigMesh: Automatic Rigging for Part-Based Shape Modeling
and Deformation
Péter BorosánMing Jin
Doug DeCarloYotam GingoldAndrew Nealen
1Thank you for the introduc1on.
I am Ming Jin, and this is Peter Borosan.
Today we are going to show you RigMesh, a system that unifies the modeling and rigging stages in state-‐of-‐the-‐art 3D modeling and anima1on pipeline.
We can create complex shapes with just a few basic opera1ons of sketching, cuHng and merging
And beJer yet, the shapes can be deformed at any step of the modeling process.
[click]
![Page 2: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/2.jpg)
Problem
2Let’s start by looking at the problem in the state-‐of-‐the-‐art and why we think this work is important.
[click]
First of all, crea1ng ready-‐to-‐animate 3D models is fundamentally hard.
This whole process is broken down into modeling and rigging.
[click]
In professional modeling tools, modeling the surfaces is usually performed manually.
The ar1st starts with coarse subdivision surfaces or parametric patches and works out all the details.
[click]
Rigging is another process in which the ar1st has to design the skeleton and specify its mappings to the model.
It is a laborious process which takes a lot of tries and fails un1l finally a sa1sfactory design is achieved.
[click]
Here is an overview of the pipeline in a nutshell.
[click]
The ar1st creates a 3D model
[click]
She rigs the model by designing the skeleton and pain1ng the skin weights
[click]
The resul1ng shape is fully rigged and ready for skin deforma1ons by skeletons. Everything seems fine.
But what if the animator wants to change the model aTer it’s been rigged?
[click]
For example, she wants to change the puffy hand into a claw?
[click]
Any changes like this will invalidate the exis1ng rig
[click]
Requiring that the model be fed back into the pipeline again
[click]
The fundamental problem here is the sta1c pipeline where modeling and rigging have to be performed sequen1ally
[click]
![Page 3: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/3.jpg)
Problem
• Creating ready-to-animate 3D models is hard
2Let’s start by looking at the problem in the state-‐of-‐the-‐art and why we think this work is important.
[click]
First of all, crea1ng ready-‐to-‐animate 3D models is fundamentally hard.
This whole process is broken down into modeling and rigging.
[click]
In professional modeling tools, modeling the surfaces is usually performed manually.
The ar1st starts with coarse subdivision surfaces or parametric patches and works out all the details.
[click]
Rigging is another process in which the ar1st has to design the skeleton and specify its mappings to the model.
It is a laborious process which takes a lot of tries and fails un1l finally a sa1sfactory design is achieved.
[click]
Here is an overview of the pipeline in a nutshell.
[click]
The ar1st creates a 3D model
[click]
She rigs the model by designing the skeleton and pain1ng the skin weights
[click]
The resul1ng shape is fully rigged and ready for skin deforma1ons by skeletons. Everything seems fine.
But what if the animator wants to change the model aTer it’s been rigged?
[click]
For example, she wants to change the puffy hand into a claw?
[click]
Any changes like this will invalidate the exis1ng rig
[click]
Requiring that the model be fed back into the pipeline again
[click]
The fundamental problem here is the sta1c pipeline where modeling and rigging have to be performed sequen1ally
[click]
![Page 4: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/4.jpg)
Modeling
Problem
• Creating ready-to-animate 3D models is hard
[youtube user: MasahiroUshiyama]
2Let’s start by looking at the problem in the state-‐of-‐the-‐art and why we think this work is important.
[click]
First of all, crea1ng ready-‐to-‐animate 3D models is fundamentally hard.
This whole process is broken down into modeling and rigging.
[click]
In professional modeling tools, modeling the surfaces is usually performed manually.
The ar1st starts with coarse subdivision surfaces or parametric patches and works out all the details.
[click]
Rigging is another process in which the ar1st has to design the skeleton and specify its mappings to the model.
It is a laborious process which takes a lot of tries and fails un1l finally a sa1sfactory design is achieved.
[click]
Here is an overview of the pipeline in a nutshell.
[click]
The ar1st creates a 3D model
[click]
She rigs the model by designing the skeleton and pain1ng the skin weights
[click]
The resul1ng shape is fully rigged and ready for skin deforma1ons by skeletons. Everything seems fine.
But what if the animator wants to change the model aTer it’s been rigged?
[click]
For example, she wants to change the puffy hand into a claw?
[click]
Any changes like this will invalidate the exis1ng rig
[click]
Requiring that the model be fed back into the pipeline again
[click]
The fundamental problem here is the sta1c pipeline where modeling and rigging have to be performed sequen1ally
[click]
![Page 5: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/5.jpg)
Modeling Rigging
Problem
• Creating ready-to-animate 3D models is hard
[Weber et al. 07][youtube user: MasahiroUshiyama]
2Let’s start by looking at the problem in the state-‐of-‐the-‐art and why we think this work is important.
[click]
First of all, crea1ng ready-‐to-‐animate 3D models is fundamentally hard.
This whole process is broken down into modeling and rigging.
[click]
In professional modeling tools, modeling the surfaces is usually performed manually.
The ar1st starts with coarse subdivision surfaces or parametric patches and works out all the details.
[click]
Rigging is another process in which the ar1st has to design the skeleton and specify its mappings to the model.
It is a laborious process which takes a lot of tries and fails un1l finally a sa1sfactory design is achieved.
[click]
Here is an overview of the pipeline in a nutshell.
[click]
The ar1st creates a 3D model
[click]
She rigs the model by designing the skeleton and pain1ng the skin weights
[click]
The resul1ng shape is fully rigged and ready for skin deforma1ons by skeletons. Everything seems fine.
But what if the animator wants to change the model aTer it’s been rigged?
[click]
For example, she wants to change the puffy hand into a claw?
[click]
Any changes like this will invalidate the exis1ng rig
[click]
Requiring that the model be fed back into the pipeline again
[click]
The fundamental problem here is the sta1c pipeline where modeling and rigging have to be performed sequen1ally
[click]
![Page 6: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/6.jpg)
Problem
• Creating ready-to-animate 3D models is hard
2Let’s start by looking at the problem in the state-‐of-‐the-‐art and why we think this work is important.
[click]
First of all, crea1ng ready-‐to-‐animate 3D models is fundamentally hard.
This whole process is broken down into modeling and rigging.
[click]
In professional modeling tools, modeling the surfaces is usually performed manually.
The ar1st starts with coarse subdivision surfaces or parametric patches and works out all the details.
[click]
Rigging is another process in which the ar1st has to design the skeleton and specify its mappings to the model.
It is a laborious process which takes a lot of tries and fails un1l finally a sa1sfactory design is achieved.
[click]
Here is an overview of the pipeline in a nutshell.
[click]
The ar1st creates a 3D model
[click]
She rigs the model by designing the skeleton and pain1ng the skin weights
[click]
The resul1ng shape is fully rigged and ready for skin deforma1ons by skeletons. Everything seems fine.
But what if the animator wants to change the model aTer it’s been rigged?
[click]
For example, she wants to change the puffy hand into a claw?
[click]
Any changes like this will invalidate the exis1ng rig
[click]
Requiring that the model be fed back into the pipeline again
[click]
The fundamental problem here is the sta1c pipeline where modeling and rigging have to be performed sequen1ally
[click]
![Page 7: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/7.jpg)
Problem
• Creating ready-to-animate 3D models is hard
2Let’s start by looking at the problem in the state-‐of-‐the-‐art and why we think this work is important.
[click]
First of all, crea1ng ready-‐to-‐animate 3D models is fundamentally hard.
This whole process is broken down into modeling and rigging.
[click]
In professional modeling tools, modeling the surfaces is usually performed manually.
The ar1st starts with coarse subdivision surfaces or parametric patches and works out all the details.
[click]
Rigging is another process in which the ar1st has to design the skeleton and specify its mappings to the model.
It is a laborious process which takes a lot of tries and fails un1l finally a sa1sfactory design is achieved.
[click]
Here is an overview of the pipeline in a nutshell.
[click]
The ar1st creates a 3D model
[click]
She rigs the model by designing the skeleton and pain1ng the skin weights
[click]
The resul1ng shape is fully rigged and ready for skin deforma1ons by skeletons. Everything seems fine.
But what if the animator wants to change the model aTer it’s been rigged?
[click]
For example, she wants to change the puffy hand into a claw?
[click]
Any changes like this will invalidate the exis1ng rig
[click]
Requiring that the model be fed back into the pipeline again
[click]
The fundamental problem here is the sta1c pipeline where modeling and rigging have to be performed sequen1ally
[click]
![Page 8: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/8.jpg)
Problem
• Creating ready-to-animate 3D models is hard
rig
2Let’s start by looking at the problem in the state-‐of-‐the-‐art and why we think this work is important.
[click]
First of all, crea1ng ready-‐to-‐animate 3D models is fundamentally hard.
This whole process is broken down into modeling and rigging.
[click]
In professional modeling tools, modeling the surfaces is usually performed manually.
The ar1st starts with coarse subdivision surfaces or parametric patches and works out all the details.
[click]
Rigging is another process in which the ar1st has to design the skeleton and specify its mappings to the model.
It is a laborious process which takes a lot of tries and fails un1l finally a sa1sfactory design is achieved.
[click]
Here is an overview of the pipeline in a nutshell.
[click]
The ar1st creates a 3D model
[click]
She rigs the model by designing the skeleton and pain1ng the skin weights
[click]
The resul1ng shape is fully rigged and ready for skin deforma1ons by skeletons. Everything seems fine.
But what if the animator wants to change the model aTer it’s been rigged?
[click]
For example, she wants to change the puffy hand into a claw?
[click]
Any changes like this will invalidate the exis1ng rig
[click]
Requiring that the model be fed back into the pipeline again
[click]
The fundamental problem here is the sta1c pipeline where modeling and rigging have to be performed sequen1ally
[click]
![Page 9: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/9.jpg)
Problem
• Creating ready-to-animate 3D models is hard
rig deform
2Let’s start by looking at the problem in the state-‐of-‐the-‐art and why we think this work is important.
[click]
First of all, crea1ng ready-‐to-‐animate 3D models is fundamentally hard.
This whole process is broken down into modeling and rigging.
[click]
In professional modeling tools, modeling the surfaces is usually performed manually.
The ar1st starts with coarse subdivision surfaces or parametric patches and works out all the details.
[click]
Rigging is another process in which the ar1st has to design the skeleton and specify its mappings to the model.
It is a laborious process which takes a lot of tries and fails un1l finally a sa1sfactory design is achieved.
[click]
Here is an overview of the pipeline in a nutshell.
[click]
The ar1st creates a 3D model
[click]
She rigs the model by designing the skeleton and pain1ng the skin weights
[click]
The resul1ng shape is fully rigged and ready for skin deforma1ons by skeletons. Everything seems fine.
But what if the animator wants to change the model aTer it’s been rigged?
[click]
For example, she wants to change the puffy hand into a claw?
[click]
Any changes like this will invalidate the exis1ng rig
[click]
Requiring that the model be fed back into the pipeline again
[click]
The fundamental problem here is the sta1c pipeline where modeling and rigging have to be performed sequen1ally
[click]
![Page 10: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/10.jpg)
Problem
• Creating ready-to-animate 3D models is hard
rig deform
2Let’s start by looking at the problem in the state-‐of-‐the-‐art and why we think this work is important.
[click]
First of all, crea1ng ready-‐to-‐animate 3D models is fundamentally hard.
This whole process is broken down into modeling and rigging.
[click]
In professional modeling tools, modeling the surfaces is usually performed manually.
The ar1st starts with coarse subdivision surfaces or parametric patches and works out all the details.
[click]
Rigging is another process in which the ar1st has to design the skeleton and specify its mappings to the model.
It is a laborious process which takes a lot of tries and fails un1l finally a sa1sfactory design is achieved.
[click]
Here is an overview of the pipeline in a nutshell.
[click]
The ar1st creates a 3D model
[click]
She rigs the model by designing the skeleton and pain1ng the skin weights
[click]
The resul1ng shape is fully rigged and ready for skin deforma1ons by skeletons. Everything seems fine.
But what if the animator wants to change the model aTer it’s been rigged?
[click]
For example, she wants to change the puffy hand into a claw?
[click]
Any changes like this will invalidate the exis1ng rig
[click]
Requiring that the model be fed back into the pipeline again
[click]
The fundamental problem here is the sta1c pipeline where modeling and rigging have to be performed sequen1ally
[click]
![Page 11: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/11.jpg)
Problem
• Creating ready-to-animate 3D models is hard
rig deform
2Let’s start by looking at the problem in the state-‐of-‐the-‐art and why we think this work is important.
[click]
First of all, crea1ng ready-‐to-‐animate 3D models is fundamentally hard.
This whole process is broken down into modeling and rigging.
[click]
In professional modeling tools, modeling the surfaces is usually performed manually.
The ar1st starts with coarse subdivision surfaces or parametric patches and works out all the details.
[click]
Rigging is another process in which the ar1st has to design the skeleton and specify its mappings to the model.
It is a laborious process which takes a lot of tries and fails un1l finally a sa1sfactory design is achieved.
[click]
Here is an overview of the pipeline in a nutshell.
[click]
The ar1st creates a 3D model
[click]
She rigs the model by designing the skeleton and pain1ng the skin weights
[click]
The resul1ng shape is fully rigged and ready for skin deforma1ons by skeletons. Everything seems fine.
But what if the animator wants to change the model aTer it’s been rigged?
[click]
For example, she wants to change the puffy hand into a claw?
[click]
Any changes like this will invalidate the exis1ng rig
[click]
Requiring that the model be fed back into the pipeline again
[click]
The fundamental problem here is the sta1c pipeline where modeling and rigging have to be performed sequen1ally
[click]
![Page 12: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/12.jpg)
Problem
• Creating ready-to-animate 3D models is hard
rig deform
2Let’s start by looking at the problem in the state-‐of-‐the-‐art and why we think this work is important.
[click]
First of all, crea1ng ready-‐to-‐animate 3D models is fundamentally hard.
This whole process is broken down into modeling and rigging.
[click]
In professional modeling tools, modeling the surfaces is usually performed manually.
The ar1st starts with coarse subdivision surfaces or parametric patches and works out all the details.
[click]
Rigging is another process in which the ar1st has to design the skeleton and specify its mappings to the model.
It is a laborious process which takes a lot of tries and fails un1l finally a sa1sfactory design is achieved.
[click]
Here is an overview of the pipeline in a nutshell.
[click]
The ar1st creates a 3D model
[click]
She rigs the model by designing the skeleton and pain1ng the skin weights
[click]
The resul1ng shape is fully rigged and ready for skin deforma1ons by skeletons. Everything seems fine.
But what if the animator wants to change the model aTer it’s been rigged?
[click]
For example, she wants to change the puffy hand into a claw?
[click]
Any changes like this will invalidate the exis1ng rig
[click]
Requiring that the model be fed back into the pipeline again
[click]
The fundamental problem here is the sta1c pipeline where modeling and rigging have to be performed sequen1ally
[click]
![Page 13: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/13.jpg)
Problem
• Creating ready-to-animate 3D models is hard
rig deform
• Fundamental problem: static sequential pipeline
2Let’s start by looking at the problem in the state-‐of-‐the-‐art and why we think this work is important.
[click]
First of all, crea1ng ready-‐to-‐animate 3D models is fundamentally hard.
This whole process is broken down into modeling and rigging.
[click]
In professional modeling tools, modeling the surfaces is usually performed manually.
The ar1st starts with coarse subdivision surfaces or parametric patches and works out all the details.
[click]
Rigging is another process in which the ar1st has to design the skeleton and specify its mappings to the model.
It is a laborious process which takes a lot of tries and fails un1l finally a sa1sfactory design is achieved.
[click]
Here is an overview of the pipeline in a nutshell.
[click]
The ar1st creates a 3D model
[click]
She rigs the model by designing the skeleton and pain1ng the skin weights
[click]
The resul1ng shape is fully rigged and ready for skin deforma1ons by skeletons. Everything seems fine.
But what if the animator wants to change the model aTer it’s been rigged?
[click]
For example, she wants to change the puffy hand into a claw?
[click]
Any changes like this will invalidate the exis1ng rig
[click]
Requiring that the model be fed back into the pipeline again
[click]
The fundamental problem here is the sta1c pipeline where modeling and rigging have to be performed sequen1ally
[click]
![Page 14: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/14.jpg)
3Recent advancement in the literature has provided various ways to simplify both modeling and rigging.
No1ceably, sketch-‐based 3D modeling has been a popular research field. It provides an easy-‐to-‐use interface and enables rapid itera1ve prototyping.
[click]
For example, the seminal paper on Teddy describes the crea1on of freeform 3D models from scratch.
[click]
As extensions to such freeform modelers, other researchers have proposed to use varia1onal implicit func1ons for the underlying shape representa1ons, such as the BlobTree used in ShapeShop.
[click]
Later, FiberMesh demonstrated how to integrate 3D control curves into sketch-‐based modeling tools. The curves on the surfaces serve as handles for controlling the geometry.
[click]
Because a single sketch usually does not suffice for crea1ng a complex shape, there has also been interes1ng work on part based modeling, such as layered surface composi1on using Surface Trees.
[click]
![Page 15: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/15.jpg)
Sketch-based Modeling
3Recent advancement in the literature has provided various ways to simplify both modeling and rigging.
No1ceably, sketch-‐based 3D modeling has been a popular research field. It provides an easy-‐to-‐use interface and enables rapid itera1ve prototyping.
[click]
For example, the seminal paper on Teddy describes the crea1on of freeform 3D models from scratch.
[click]
As extensions to such freeform modelers, other researchers have proposed to use varia1onal implicit func1ons for the underlying shape representa1ons, such as the BlobTree used in ShapeShop.
[click]
Later, FiberMesh demonstrated how to integrate 3D control curves into sketch-‐based modeling tools. The curves on the surfaces serve as handles for controlling the geometry.
[click]
Because a single sketch usually does not suffice for crea1ng a complex shape, there has also been interes1ng work on part based modeling, such as layered surface composi1on using Surface Trees.
[click]
![Page 16: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/16.jpg)
Sketch-based Modeling
• Teddy [Igarashi et al. 99]
3Recent advancement in the literature has provided various ways to simplify both modeling and rigging.
No1ceably, sketch-‐based 3D modeling has been a popular research field. It provides an easy-‐to-‐use interface and enables rapid itera1ve prototyping.
[click]
For example, the seminal paper on Teddy describes the crea1on of freeform 3D models from scratch.
[click]
As extensions to such freeform modelers, other researchers have proposed to use varia1onal implicit func1ons for the underlying shape representa1ons, such as the BlobTree used in ShapeShop.
[click]
Later, FiberMesh demonstrated how to integrate 3D control curves into sketch-‐based modeling tools. The curves on the surfaces serve as handles for controlling the geometry.
[click]
Because a single sketch usually does not suffice for crea1ng a complex shape, there has also been interes1ng work on part based modeling, such as layered surface composi1on using Surface Trees.
[click]
![Page 17: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/17.jpg)
Sketch-based Modeling
• Teddy [Igarashi et al. 99]• ShapeShop [Schmidt et al. 05]
3Recent advancement in the literature has provided various ways to simplify both modeling and rigging.
No1ceably, sketch-‐based 3D modeling has been a popular research field. It provides an easy-‐to-‐use interface and enables rapid itera1ve prototyping.
[click]
For example, the seminal paper on Teddy describes the crea1on of freeform 3D models from scratch.
[click]
As extensions to such freeform modelers, other researchers have proposed to use varia1onal implicit func1ons for the underlying shape representa1ons, such as the BlobTree used in ShapeShop.
[click]
Later, FiberMesh demonstrated how to integrate 3D control curves into sketch-‐based modeling tools. The curves on the surfaces serve as handles for controlling the geometry.
[click]
Because a single sketch usually does not suffice for crea1ng a complex shape, there has also been interes1ng work on part based modeling, such as layered surface composi1on using Surface Trees.
[click]
![Page 18: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/18.jpg)
Sketch-based Modeling
• Teddy [Igarashi et al. 99]• ShapeShop [Schmidt et al. 05]• FiberMesh [Nealen et al. 07]
3Recent advancement in the literature has provided various ways to simplify both modeling and rigging.
No1ceably, sketch-‐based 3D modeling has been a popular research field. It provides an easy-‐to-‐use interface and enables rapid itera1ve prototyping.
[click]
For example, the seminal paper on Teddy describes the crea1on of freeform 3D models from scratch.
[click]
As extensions to such freeform modelers, other researchers have proposed to use varia1onal implicit func1ons for the underlying shape representa1ons, such as the BlobTree used in ShapeShop.
[click]
Later, FiberMesh demonstrated how to integrate 3D control curves into sketch-‐based modeling tools. The curves on the surfaces serve as handles for controlling the geometry.
[click]
Because a single sketch usually does not suffice for crea1ng a complex shape, there has also been interes1ng work on part based modeling, such as layered surface composi1on using Surface Trees.
[click]
![Page 19: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/19.jpg)
Sketch-based Modeling
• Teddy [Igarashi et al. 99]• ShapeShop [Schmidt et al. 05]• FiberMesh [Nealen et al. 07]• SurfaceTrees [Schmidt and Singh 08]
3Recent advancement in the literature has provided various ways to simplify both modeling and rigging.
No1ceably, sketch-‐based 3D modeling has been a popular research field. It provides an easy-‐to-‐use interface and enables rapid itera1ve prototyping.
[click]
For example, the seminal paper on Teddy describes the crea1on of freeform 3D models from scratch.
[click]
As extensions to such freeform modelers, other researchers have proposed to use varia1onal implicit func1ons for the underlying shape representa1ons, such as the BlobTree used in ShapeShop.
[click]
Later, FiberMesh demonstrated how to integrate 3D control curves into sketch-‐based modeling tools. The curves on the surfaces serve as handles for controlling the geometry.
[click]
Because a single sketch usually does not suffice for crea1ng a complex shape, there has also been interes1ng work on part based modeling, such as layered surface composi1on using Surface Trees.
[click]
![Page 20: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/20.jpg)
Automatic Rigging
4While sketch-‐based tools simplify the process of modeling, there also exists work in the literature that inspires automa1c rigging on finished models.
[click]
Skeleton extrac1on is a well-‐studied problem in different communi1es such as vision, psychology and graphics.
[click]
For example, here’s a recent survey on a lot of work from genera1ng 2D medial-‐axes, 3D medial surfaces to 3D curve-‐skeletons.
[click]
On the other hand, if the skeleton topology is known, 3D models can be rigged using skeleton embedding and automa1c skinning. For example, the Pinocchio system proposed an automa1c skinning method using heat diffusion.
[click]
![Page 21: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/21.jpg)
Automatic Rigging
• Skeleton extraction [Sharf et al. 07] [Pan et al. 09] [Ju et al. 11]
4While sketch-‐based tools simplify the process of modeling, there also exists work in the literature that inspires automa1c rigging on finished models.
[click]
Skeleton extrac1on is a well-‐studied problem in different communi1es such as vision, psychology and graphics.
[click]
For example, here’s a recent survey on a lot of work from genera1ng 2D medial-‐axes, 3D medial surfaces to 3D curve-‐skeletons.
[click]
On the other hand, if the skeleton topology is known, 3D models can be rigged using skeleton embedding and automa1c skinning. For example, the Pinocchio system proposed an automa1c skinning method using heat diffusion.
[click]
![Page 22: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/22.jpg)
Automatic Rigging
• Skeleton extraction [Sharf et al. 07] [Pan et al. 09] [Ju et al. 11]
[Cornea et al. 07]
4While sketch-‐based tools simplify the process of modeling, there also exists work in the literature that inspires automa1c rigging on finished models.
[click]
Skeleton extrac1on is a well-‐studied problem in different communi1es such as vision, psychology and graphics.
[click]
For example, here’s a recent survey on a lot of work from genera1ng 2D medial-‐axes, 3D medial surfaces to 3D curve-‐skeletons.
[click]
On the other hand, if the skeleton topology is known, 3D models can be rigged using skeleton embedding and automa1c skinning. For example, the Pinocchio system proposed an automa1c skinning method using heat diffusion.
[click]
![Page 23: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/23.jpg)
Automatic Rigging
• Skeleton extraction [Sharf et al. 07] [Pan et al. 09] [Ju et al. 11]
[Cornea et al. 07] • Automatic skinning Pinocchio [Baran and Popović 07]
4While sketch-‐based tools simplify the process of modeling, there also exists work in the literature that inspires automa1c rigging on finished models.
[click]
Skeleton extrac1on is a well-‐studied problem in different communi1es such as vision, psychology and graphics.
[click]
For example, here’s a recent survey on a lot of work from genera1ng 2D medial-‐axes, 3D medial surfaces to 3D curve-‐skeletons.
[click]
On the other hand, if the skeleton topology is known, 3D models can be rigged using skeleton embedding and automa1c skinning. For example, the Pinocchio system proposed an automa1c skinning method using heat diffusion.
[click]
![Page 24: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/24.jpg)
Solution?Solution
5Now, if we take a look again at the previous pipeline, can we use these exis1ng methods to solve the problem?
[click]
For example, we can use sketch-‐based modeling tools such as FiberMesh for the modeling part
[click]
and use automa1c rigging such as Pinocchio for the rigging part?
[click]
Unfortunately, this s1ll does not change the linearity of the pipeline.
Also the automa1c rigging methods are typically not fast enough for real-‐1me interac1ons.
If the animators want to rapidly iterate on their designs, they shouldn’t have to go through the en1re pipeline
[click]
Here is the solu1on we propose:
In order to break the sequen1al pipeline, the model should be rigged at all 1mes.
[click]
As a result of that:
The animator can perform non-‐linear edi1ng in terms of modeling, rigging and deforma1on
[click]
She can also model by parts;[short pause]
Here is what the whole modeling process should look like.
[click]
ATer shape crea1on the model is already rigged
[click]
The animator can freely pose and change the model
[click]
For example, if she’s not sa1sfied with the hand, she can remove it use a cuHng opera1on
[click]
And replace it with a new part by using the merging opera1on
[click]
All of these opera1ons should happen in real 1me
[click]
![Page 25: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/25.jpg)
Solution?
rig deform
Solution
5Now, if we take a look again at the previous pipeline, can we use these exis1ng methods to solve the problem?
[click]
For example, we can use sketch-‐based modeling tools such as FiberMesh for the modeling part
[click]
and use automa1c rigging such as Pinocchio for the rigging part?
[click]
Unfortunately, this s1ll does not change the linearity of the pipeline.
Also the automa1c rigging methods are typically not fast enough for real-‐1me interac1ons.
If the animators want to rapidly iterate on their designs, they shouldn’t have to go through the en1re pipeline
[click]
Here is the solu1on we propose:
In order to break the sequen1al pipeline, the model should be rigged at all 1mes.
[click]
As a result of that:
The animator can perform non-‐linear edi1ng in terms of modeling, rigging and deforma1on
[click]
She can also model by parts;[short pause]
Here is what the whole modeling process should look like.
[click]
ATer shape crea1on the model is already rigged
[click]
The animator can freely pose and change the model
[click]
For example, if she’s not sa1sfied with the hand, she can remove it use a cuHng opera1on
[click]
And replace it with a new part by using the merging opera1on
[click]
All of these opera1ons should happen in real 1me
[click]
![Page 26: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/26.jpg)
Solution?
rig deform
Solution
5Now, if we take a look again at the previous pipeline, can we use these exis1ng methods to solve the problem?
[click]
For example, we can use sketch-‐based modeling tools such as FiberMesh for the modeling part
[click]
and use automa1c rigging such as Pinocchio for the rigging part?
[click]
Unfortunately, this s1ll does not change the linearity of the pipeline.
Also the automa1c rigging methods are typically not fast enough for real-‐1me interac1ons.
If the animators want to rapidly iterate on their designs, they shouldn’t have to go through the en1re pipeline
[click]
Here is the solu1on we propose:
In order to break the sequen1al pipeline, the model should be rigged at all 1mes.
[click]
As a result of that:
The animator can perform non-‐linear edi1ng in terms of modeling, rigging and deforma1on
[click]
She can also model by parts;[short pause]
Here is what the whole modeling process should look like.
[click]
ATer shape crea1on the model is already rigged
[click]
The animator can freely pose and change the model
[click]
For example, if she’s not sa1sfied with the hand, she can remove it use a cuHng opera1on
[click]
And replace it with a new part by using the merging opera1on
[click]
All of these opera1ons should happen in real 1me
[click]
![Page 27: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/27.jpg)
Solution?
rig deform
Solution
5Now, if we take a look again at the previous pipeline, can we use these exis1ng methods to solve the problem?
[click]
For example, we can use sketch-‐based modeling tools such as FiberMesh for the modeling part
[click]
and use automa1c rigging such as Pinocchio for the rigging part?
[click]
Unfortunately, this s1ll does not change the linearity of the pipeline.
Also the automa1c rigging methods are typically not fast enough for real-‐1me interac1ons.
If the animators want to rapidly iterate on their designs, they shouldn’t have to go through the en1re pipeline
[click]
Here is the solu1on we propose:
In order to break the sequen1al pipeline, the model should be rigged at all 1mes.
[click]
As a result of that:
The animator can perform non-‐linear edi1ng in terms of modeling, rigging and deforma1on
[click]
She can also model by parts;[short pause]
Here is what the whole modeling process should look like.
[click]
ATer shape crea1on the model is already rigged
[click]
The animator can freely pose and change the model
[click]
For example, if she’s not sa1sfied with the hand, she can remove it use a cuHng opera1on
[click]
And replace it with a new part by using the merging opera1on
[click]
All of these opera1ons should happen in real 1me
[click]
![Page 28: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/28.jpg)
Solution?
rig deform
Solution
5Now, if we take a look again at the previous pipeline, can we use these exis1ng methods to solve the problem?
[click]
For example, we can use sketch-‐based modeling tools such as FiberMesh for the modeling part
[click]
and use automa1c rigging such as Pinocchio for the rigging part?
[click]
Unfortunately, this s1ll does not change the linearity of the pipeline.
Also the automa1c rigging methods are typically not fast enough for real-‐1me interac1ons.
If the animators want to rapidly iterate on their designs, they shouldn’t have to go through the en1re pipeline
[click]
Here is the solu1on we propose:
In order to break the sequen1al pipeline, the model should be rigged at all 1mes.
[click]
As a result of that:
The animator can perform non-‐linear edi1ng in terms of modeling, rigging and deforma1on
[click]
She can also model by parts;[short pause]
Here is what the whole modeling process should look like.
[click]
ATer shape crea1on the model is already rigged
[click]
The animator can freely pose and change the model
[click]
For example, if she’s not sa1sfied with the hand, she can remove it use a cuHng opera1on
[click]
And replace it with a new part by using the merging opera1on
[click]
All of these opera1ons should happen in real 1me
[click]
![Page 29: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/29.jpg)
rig deform
Solution
Models rigged at all times
5Now, if we take a look again at the previous pipeline, can we use these exis1ng methods to solve the problem?
[click]
For example, we can use sketch-‐based modeling tools such as FiberMesh for the modeling part
[click]
and use automa1c rigging such as Pinocchio for the rigging part?
[click]
Unfortunately, this s1ll does not change the linearity of the pipeline.
Also the automa1c rigging methods are typically not fast enough for real-‐1me interac1ons.
If the animators want to rapidly iterate on their designs, they shouldn’t have to go through the en1re pipeline
[click]
Here is the solu1on we propose:
In order to break the sequen1al pipeline, the model should be rigged at all 1mes.
[click]
As a result of that:
The animator can perform non-‐linear edi1ng in terms of modeling, rigging and deforma1on
[click]
She can also model by parts;[short pause]
Here is what the whole modeling process should look like.
[click]
ATer shape crea1on the model is already rigged
[click]
The animator can freely pose and change the model
[click]
For example, if she’s not sa1sfied with the hand, she can remove it use a cuHng opera1on
[click]
And replace it with a new part by using the merging opera1on
[click]
All of these opera1ons should happen in real 1me
[click]
![Page 30: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/30.jpg)
rig deform
Solution
Models rigged at all times• Non-linear editing
5Now, if we take a look again at the previous pipeline, can we use these exis1ng methods to solve the problem?
[click]
For example, we can use sketch-‐based modeling tools such as FiberMesh for the modeling part
[click]
and use automa1c rigging such as Pinocchio for the rigging part?
[click]
Unfortunately, this s1ll does not change the linearity of the pipeline.
Also the automa1c rigging methods are typically not fast enough for real-‐1me interac1ons.
If the animators want to rapidly iterate on their designs, they shouldn’t have to go through the en1re pipeline
[click]
Here is the solu1on we propose:
In order to break the sequen1al pipeline, the model should be rigged at all 1mes.
[click]
As a result of that:
The animator can perform non-‐linear edi1ng in terms of modeling, rigging and deforma1on
[click]
She can also model by parts;[short pause]
Here is what the whole modeling process should look like.
[click]
ATer shape crea1on the model is already rigged
[click]
The animator can freely pose and change the model
[click]
For example, if she’s not sa1sfied with the hand, she can remove it use a cuHng opera1on
[click]
And replace it with a new part by using the merging opera1on
[click]
All of these opera1ons should happen in real 1me
[click]
![Page 31: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/31.jpg)
rig deform
Solution
Models rigged at all times• Non-linear editing• Modeling by parts
5Now, if we take a look again at the previous pipeline, can we use these exis1ng methods to solve the problem?
[click]
For example, we can use sketch-‐based modeling tools such as FiberMesh for the modeling part
[click]
and use automa1c rigging such as Pinocchio for the rigging part?
[click]
Unfortunately, this s1ll does not change the linearity of the pipeline.
Also the automa1c rigging methods are typically not fast enough for real-‐1me interac1ons.
If the animators want to rapidly iterate on their designs, they shouldn’t have to go through the en1re pipeline
[click]
Here is the solu1on we propose:
In order to break the sequen1al pipeline, the model should be rigged at all 1mes.
[click]
As a result of that:
The animator can perform non-‐linear edi1ng in terms of modeling, rigging and deforma1on
[click]
She can also model by parts;[short pause]
Here is what the whole modeling process should look like.
[click]
ATer shape crea1on the model is already rigged
[click]
The animator can freely pose and change the model
[click]
For example, if she’s not sa1sfied with the hand, she can remove it use a cuHng opera1on
[click]
And replace it with a new part by using the merging opera1on
[click]
All of these opera1ons should happen in real 1me
[click]
![Page 32: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/32.jpg)
rig deform
Solution
Models rigged at all times• Non-linear editing• Modeling by parts
5Now, if we take a look again at the previous pipeline, can we use these exis1ng methods to solve the problem?
[click]
For example, we can use sketch-‐based modeling tools such as FiberMesh for the modeling part
[click]
and use automa1c rigging such as Pinocchio for the rigging part?
[click]
Unfortunately, this s1ll does not change the linearity of the pipeline.
Also the automa1c rigging methods are typically not fast enough for real-‐1me interac1ons.
If the animators want to rapidly iterate on their designs, they shouldn’t have to go through the en1re pipeline
[click]
Here is the solu1on we propose:
In order to break the sequen1al pipeline, the model should be rigged at all 1mes.
[click]
As a result of that:
The animator can perform non-‐linear edi1ng in terms of modeling, rigging and deforma1on
[click]
She can also model by parts;[short pause]
Here is what the whole modeling process should look like.
[click]
ATer shape crea1on the model is already rigged
[click]
The animator can freely pose and change the model
[click]
For example, if she’s not sa1sfied with the hand, she can remove it use a cuHng opera1on
[click]
And replace it with a new part by using the merging opera1on
[click]
All of these opera1ons should happen in real 1me
[click]
![Page 33: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/33.jpg)
rig deform
Solution
Models rigged at all times• Non-linear editing• Modeling by parts
5Now, if we take a look again at the previous pipeline, can we use these exis1ng methods to solve the problem?
[click]
For example, we can use sketch-‐based modeling tools such as FiberMesh for the modeling part
[click]
and use automa1c rigging such as Pinocchio for the rigging part?
[click]
Unfortunately, this s1ll does not change the linearity of the pipeline.
Also the automa1c rigging methods are typically not fast enough for real-‐1me interac1ons.
If the animators want to rapidly iterate on their designs, they shouldn’t have to go through the en1re pipeline
[click]
Here is the solu1on we propose:
In order to break the sequen1al pipeline, the model should be rigged at all 1mes.
[click]
As a result of that:
The animator can perform non-‐linear edi1ng in terms of modeling, rigging and deforma1on
[click]
She can also model by parts;[short pause]
Here is what the whole modeling process should look like.
[click]
ATer shape crea1on the model is already rigged
[click]
The animator can freely pose and change the model
[click]
For example, if she’s not sa1sfied with the hand, she can remove it use a cuHng opera1on
[click]
And replace it with a new part by using the merging opera1on
[click]
All of these opera1ons should happen in real 1me
[click]
![Page 34: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/34.jpg)
rig deform
Solution
Models rigged at all times• Non-linear editing• Modeling by parts
5Now, if we take a look again at the previous pipeline, can we use these exis1ng methods to solve the problem?
[click]
For example, we can use sketch-‐based modeling tools such as FiberMesh for the modeling part
[click]
and use automa1c rigging such as Pinocchio for the rigging part?
[click]
Unfortunately, this s1ll does not change the linearity of the pipeline.
Also the automa1c rigging methods are typically not fast enough for real-‐1me interac1ons.
If the animators want to rapidly iterate on their designs, they shouldn’t have to go through the en1re pipeline
[click]
Here is the solu1on we propose:
In order to break the sequen1al pipeline, the model should be rigged at all 1mes.
[click]
As a result of that:
The animator can perform non-‐linear edi1ng in terms of modeling, rigging and deforma1on
[click]
She can also model by parts;[short pause]
Here is what the whole modeling process should look like.
[click]
ATer shape crea1on the model is already rigged
[click]
The animator can freely pose and change the model
[click]
For example, if she’s not sa1sfied with the hand, she can remove it use a cuHng opera1on
[click]
And replace it with a new part by using the merging opera1on
[click]
All of these opera1ons should happen in real 1me
[click]
![Page 35: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/35.jpg)
rig deform
Solution
Models rigged at all times• Non-linear editing• Modeling by parts
5Now, if we take a look again at the previous pipeline, can we use these exis1ng methods to solve the problem?
[click]
For example, we can use sketch-‐based modeling tools such as FiberMesh for the modeling part
[click]
and use automa1c rigging such as Pinocchio for the rigging part?
[click]
Unfortunately, this s1ll does not change the linearity of the pipeline.
Also the automa1c rigging methods are typically not fast enough for real-‐1me interac1ons.
If the animators want to rapidly iterate on their designs, they shouldn’t have to go through the en1re pipeline
[click]
Here is the solu1on we propose:
In order to break the sequen1al pipeline, the model should be rigged at all 1mes.
[click]
As a result of that:
The animator can perform non-‐linear edi1ng in terms of modeling, rigging and deforma1on
[click]
She can also model by parts;[short pause]
Here is what the whole modeling process should look like.
[click]
ATer shape crea1on the model is already rigged
[click]
The animator can freely pose and change the model
[click]
For example, if she’s not sa1sfied with the hand, she can remove it use a cuHng opera1on
[click]
And replace it with a new part by using the merging opera1on
[click]
All of these opera1ons should happen in real 1me
[click]
![Page 36: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/36.jpg)
rig deform
Solution
Models rigged at all times• Non-linear editing• Modeling by parts
5Now, if we take a look again at the previous pipeline, can we use these exis1ng methods to solve the problem?
[click]
For example, we can use sketch-‐based modeling tools such as FiberMesh for the modeling part
[click]
and use automa1c rigging such as Pinocchio for the rigging part?
[click]
Unfortunately, this s1ll does not change the linearity of the pipeline.
Also the automa1c rigging methods are typically not fast enough for real-‐1me interac1ons.
If the animators want to rapidly iterate on their designs, they shouldn’t have to go through the en1re pipeline
[click]
Here is the solu1on we propose:
In order to break the sequen1al pipeline, the model should be rigged at all 1mes.
[click]
As a result of that:
The animator can perform non-‐linear edi1ng in terms of modeling, rigging and deforma1on
[click]
She can also model by parts;[short pause]
Here is what the whole modeling process should look like.
[click]
ATer shape crea1on the model is already rigged
[click]
The animator can freely pose and change the model
[click]
For example, if she’s not sa1sfied with the hand, she can remove it use a cuHng opera1on
[click]
And replace it with a new part by using the merging opera1on
[click]
All of these opera1ons should happen in real 1me
[click]
![Page 37: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/37.jpg)
RigMeshContributions
Models rigged at all times• Non-linear editing• Modeling by parts
6Here are our contribu1ons in light of the proposed solu1on:
[click]
In addi1on to enabling non-‐linear edi1ng, the animator can model by parts using three basic opera1ons of sketching, cuHng and merging;
[click]
We propose a method for automa1cally determining the bone skeleton from the user sketch; specifically determining the number and placement of the joints, which is the key issue in our system for controls and degrees of freedom;
[click]
Because the shape can be locally changed using opera1ons like cuHng and merging, we need to come up with a method for upda1ng the skin weights in real-‐1me, without globally re-‐skinning the whole shape.
[click]
![Page 38: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/38.jpg)
RigMeshContributionsModels rigged at all times
• Non-linear editing• Modeling by parts: Sketch, Cut & Merge
6Here are our contribu1ons in light of the proposed solu1on:
[click]
In addi1on to enabling non-‐linear edi1ng, the animator can model by parts using three basic opera1ons of sketching, cuHng and merging;
[click]
We propose a method for automa1cally determining the bone skeleton from the user sketch; specifically determining the number and placement of the joints, which is the key issue in our system for controls and degrees of freedom;
[click]
Because the shape can be locally changed using opera1ons like cuHng and merging, we need to come up with a method for upda1ng the skin weights in real-‐1me, without globally re-‐skinning the whole shape.
[click]
![Page 39: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/39.jpg)
• Automatically determining skeletal structure from sketch
RigMeshContributionsModels rigged at all times
• Non-linear editing• Modeling by parts: Sketch, Cut & Merge
6Here are our contribu1ons in light of the proposed solu1on:
[click]
In addi1on to enabling non-‐linear edi1ng, the animator can model by parts using three basic opera1ons of sketching, cuHng and merging;
[click]
We propose a method for automa1cally determining the bone skeleton from the user sketch; specifically determining the number and placement of the joints, which is the key issue in our system for controls and degrees of freedom;
[click]
Because the shape can be locally changed using opera1ons like cuHng and merging, we need to come up with a method for upda1ng the skin weights in real-‐1me, without globally re-‐skinning the whole shape.
[click]
![Page 40: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/40.jpg)
• Automatically determining skeletal structure from sketch
• Efficient local skin weights computation
RigMeshContributionsModels rigged at all times
• Non-linear editing• Modeling by parts: Sketch, Cut & Merge
6Here are our contribu1ons in light of the proposed solu1on:
[click]
In addi1on to enabling non-‐linear edi1ng, the animator can model by parts using three basic opera1ons of sketching, cuHng and merging;
[click]
We propose a method for automa1cally determining the bone skeleton from the user sketch; specifically determining the number and placement of the joints, which is the key issue in our system for controls and degrees of freedom;
[click]
Because the shape can be locally changed using opera1ons like cuHng and merging, we need to come up with a method for upda1ng the skin weights in real-‐1me, without globally re-‐skinning the whole shape.
[click]
![Page 41: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/41.jpg)
Demo
7Now I’m going to show you an interac1ve demo:
So this is the RigMesh system. You can create a 3D model by sketching its silhoueJe, like in Teddy or FiberMesh.
The big difference is that the shape is already rigged. You can deform it using IK with our peeling interface. This is a simple opera1on in our system because the shapes are rigged at all 1mes.
Now let’s say you already have some exis1ng models, for example a chess piece. You can try out your different ideas by sketching, cuHng and merging.
Let’s sketch some arms for this chess piece… and make a copy of it.
If you want to merge the arm with the body, you can either merge by snapping exis1ng joints, or by adding a new joint and snapping there; you can also merge by inser1ng a new bone.
You can also change the exis1ng skeleton topology by inser1ng new joints.
Let’s aJach the arm this way… and pose the shape.
Now during posing, you might no1ce that the shape would look beJer if we made some changes to it. For example, you might want a claw instead a puffy hand.
Let’s cut it out, and replace it with something else. I already have a claw so let’s load it in… and merge it.
Do the same thing for the other arm.
And pose the shape a liJle bit more.
So you see our tool is especially useful for rapid prototyping, trying out different ideas when you don’t even have a specific design goal in mind.
[aTer demo]
Thanks a lot for your aJen1on. I will now hand it over to Peter.
![Page 42: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/42.jpg)
Shape creation
8Thank you. So let’s see what’s going on behind the scenes.
As you’ve seen in the demo the user can sketch the silhoueJe of the desired 3D shape, and our system generates a surface composed of smoothly joined generalized cylinders, a skeleton, and skin weights aJaching the surface to the skeleton.
First The user’s sketched curve is closed and treated as a planar polygon
[click]
and then chordal axis transform is applied to this polygon, and by refining the results we obtain a decomposi1on into cylindrical regions [click] with well defined local symmetry and connec1ng regions lacking such symmetry. These regions are then treated in a different way.
For the cylindrical regions high quality skeletons are extracted using a modifica1on of the DP algorithm, [c] and generalized cylinder surfaces are created by using the 2D local symmetry axes as cylinder axes. [c]
Then using the informa1on from the connec1ng regions the skeleton parts are connected to create an easy to use low DOF skeleton [c]
Similarly generalized cylinder surfaces are connected at connec1ng regions resul1ng in a water1ght mesh. [c]
The surface is then aJached to the skeleton by compu1ng smooth skin weights following the Pinnochio method of Baran and Popovic.
This skinning algorithm has two parts: bounding the surface ver1ces to bones of the skeleton and ensuring smoothness by solving a Laplacian system. The bounding for ver1ces are trivially known for ver1ces in cylindrical regions, so it only has to be computed for ver1ces on connec1ng regions.
The user can then combine the resul1ng model with an exis1ng one. [c] The surfaces and skeletons are merged [c], and the skin weights must be updated. While the same algorithm could be used again, it slows considerably as the complexity of the shape increases. [c] But observe that only the skin weights of ver1ces near the merge boundary, a small frac1on of all ver1ces are no1ceably affected. This allows for a local skin weight re-‐computa1on that greatly accelerates the process. [c]
Because of the 1me constraint, now I will talk about the details of the skeleton construc1on for the cylindrical regions, if interested the other steps can be found in our paper.
![Page 43: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/43.jpg)
Shape creation
8Thank you. So let’s see what’s going on behind the scenes.
As you’ve seen in the demo the user can sketch the silhoueJe of the desired 3D shape, and our system generates a surface composed of smoothly joined generalized cylinders, a skeleton, and skin weights aJaching the surface to the skeleton.
First The user’s sketched curve is closed and treated as a planar polygon
[click]
and then chordal axis transform is applied to this polygon, and by refining the results we obtain a decomposi1on into cylindrical regions [click] with well defined local symmetry and connec1ng regions lacking such symmetry. These regions are then treated in a different way.
For the cylindrical regions high quality skeletons are extracted using a modifica1on of the DP algorithm, [c] and generalized cylinder surfaces are created by using the 2D local symmetry axes as cylinder axes. [c]
Then using the informa1on from the connec1ng regions the skeleton parts are connected to create an easy to use low DOF skeleton [c]
Similarly generalized cylinder surfaces are connected at connec1ng regions resul1ng in a water1ght mesh. [c]
The surface is then aJached to the skeleton by compu1ng smooth skin weights following the Pinnochio method of Baran and Popovic.
This skinning algorithm has two parts: bounding the surface ver1ces to bones of the skeleton and ensuring smoothness by solving a Laplacian system. The bounding for ver1ces are trivially known for ver1ces in cylindrical regions, so it only has to be computed for ver1ces on connec1ng regions.
The user can then combine the resul1ng model with an exis1ng one. [c] The surfaces and skeletons are merged [c], and the skin weights must be updated. While the same algorithm could be used again, it slows considerably as the complexity of the shape increases. [c] But observe that only the skin weights of ver1ces near the merge boundary, a small frac1on of all ver1ces are no1ceably affected. This allows for a local skin weight re-‐computa1on that greatly accelerates the process. [c]
Because of the 1me constraint, now I will talk about the details of the skeleton construc1on for the cylindrical regions, if interested the other steps can be found in our paper.
![Page 44: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/44.jpg)
Shape creation
8Thank you. So let’s see what’s going on behind the scenes.
As you’ve seen in the demo the user can sketch the silhoueJe of the desired 3D shape, and our system generates a surface composed of smoothly joined generalized cylinders, a skeleton, and skin weights aJaching the surface to the skeleton.
First The user’s sketched curve is closed and treated as a planar polygon
[click]
and then chordal axis transform is applied to this polygon, and by refining the results we obtain a decomposi1on into cylindrical regions [click] with well defined local symmetry and connec1ng regions lacking such symmetry. These regions are then treated in a different way.
For the cylindrical regions high quality skeletons are extracted using a modifica1on of the DP algorithm, [c] and generalized cylinder surfaces are created by using the 2D local symmetry axes as cylinder axes. [c]
Then using the informa1on from the connec1ng regions the skeleton parts are connected to create an easy to use low DOF skeleton [c]
Similarly generalized cylinder surfaces are connected at connec1ng regions resul1ng in a water1ght mesh. [c]
The surface is then aJached to the skeleton by compu1ng smooth skin weights following the Pinnochio method of Baran and Popovic.
This skinning algorithm has two parts: bounding the surface ver1ces to bones of the skeleton and ensuring smoothness by solving a Laplacian system. The bounding for ver1ces are trivially known for ver1ces in cylindrical regions, so it only has to be computed for ver1ces on connec1ng regions.
The user can then combine the resul1ng model with an exis1ng one. [c] The surfaces and skeletons are merged [c], and the skin weights must be updated. While the same algorithm could be used again, it slows considerably as the complexity of the shape increases. [c] But observe that only the skin weights of ver1ces near the merge boundary, a small frac1on of all ver1ces are no1ceably affected. This allows for a local skin weight re-‐computa1on that greatly accelerates the process. [c]
Because of the 1me constraint, now I will talk about the details of the skeleton construc1on for the cylindrical regions, if interested the other steps can be found in our paper.
![Page 45: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/45.jpg)
Shape creation
8Thank you. So let’s see what’s going on behind the scenes.
As you’ve seen in the demo the user can sketch the silhoueJe of the desired 3D shape, and our system generates a surface composed of smoothly joined generalized cylinders, a skeleton, and skin weights aJaching the surface to the skeleton.
First The user’s sketched curve is closed and treated as a planar polygon
[click]
and then chordal axis transform is applied to this polygon, and by refining the results we obtain a decomposi1on into cylindrical regions [click] with well defined local symmetry and connec1ng regions lacking such symmetry. These regions are then treated in a different way.
For the cylindrical regions high quality skeletons are extracted using a modifica1on of the DP algorithm, [c] and generalized cylinder surfaces are created by using the 2D local symmetry axes as cylinder axes. [c]
Then using the informa1on from the connec1ng regions the skeleton parts are connected to create an easy to use low DOF skeleton [c]
Similarly generalized cylinder surfaces are connected at connec1ng regions resul1ng in a water1ght mesh. [c]
The surface is then aJached to the skeleton by compu1ng smooth skin weights following the Pinnochio method of Baran and Popovic.
This skinning algorithm has two parts: bounding the surface ver1ces to bones of the skeleton and ensuring smoothness by solving a Laplacian system. The bounding for ver1ces are trivially known for ver1ces in cylindrical regions, so it only has to be computed for ver1ces on connec1ng regions.
The user can then combine the resul1ng model with an exis1ng one. [c] The surfaces and skeletons are merged [c], and the skin weights must be updated. While the same algorithm could be used again, it slows considerably as the complexity of the shape increases. [c] But observe that only the skin weights of ver1ces near the merge boundary, a small frac1on of all ver1ces are no1ceably affected. This allows for a local skin weight re-‐computa1on that greatly accelerates the process. [c]
Because of the 1me constraint, now I will talk about the details of the skeleton construc1on for the cylindrical regions, if interested the other steps can be found in our paper.
![Page 46: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/46.jpg)
Shape creation
8Thank you. So let’s see what’s going on behind the scenes.
As you’ve seen in the demo the user can sketch the silhoueJe of the desired 3D shape, and our system generates a surface composed of smoothly joined generalized cylinders, a skeleton, and skin weights aJaching the surface to the skeleton.
First The user’s sketched curve is closed and treated as a planar polygon
[click]
and then chordal axis transform is applied to this polygon, and by refining the results we obtain a decomposi1on into cylindrical regions [click] with well defined local symmetry and connec1ng regions lacking such symmetry. These regions are then treated in a different way.
For the cylindrical regions high quality skeletons are extracted using a modifica1on of the DP algorithm, [c] and generalized cylinder surfaces are created by using the 2D local symmetry axes as cylinder axes. [c]
Then using the informa1on from the connec1ng regions the skeleton parts are connected to create an easy to use low DOF skeleton [c]
Similarly generalized cylinder surfaces are connected at connec1ng regions resul1ng in a water1ght mesh. [c]
The surface is then aJached to the skeleton by compu1ng smooth skin weights following the Pinnochio method of Baran and Popovic.
This skinning algorithm has two parts: bounding the surface ver1ces to bones of the skeleton and ensuring smoothness by solving a Laplacian system. The bounding for ver1ces are trivially known for ver1ces in cylindrical regions, so it only has to be computed for ver1ces on connec1ng regions.
The user can then combine the resul1ng model with an exis1ng one. [c] The surfaces and skeletons are merged [c], and the skin weights must be updated. While the same algorithm could be used again, it slows considerably as the complexity of the shape increases. [c] But observe that only the skin weights of ver1ces near the merge boundary, a small frac1on of all ver1ces are no1ceably affected. This allows for a local skin weight re-‐computa1on that greatly accelerates the process. [c]
Because of the 1me constraint, now I will talk about the details of the skeleton construc1on for the cylindrical regions, if interested the other steps can be found in our paper.
![Page 47: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/47.jpg)
Shape creation
8Thank you. So let’s see what’s going on behind the scenes.
As you’ve seen in the demo the user can sketch the silhoueJe of the desired 3D shape, and our system generates a surface composed of smoothly joined generalized cylinders, a skeleton, and skin weights aJaching the surface to the skeleton.
First The user’s sketched curve is closed and treated as a planar polygon
[click]
and then chordal axis transform is applied to this polygon, and by refining the results we obtain a decomposi1on into cylindrical regions [click] with well defined local symmetry and connec1ng regions lacking such symmetry. These regions are then treated in a different way.
For the cylindrical regions high quality skeletons are extracted using a modifica1on of the DP algorithm, [c] and generalized cylinder surfaces are created by using the 2D local symmetry axes as cylinder axes. [c]
Then using the informa1on from the connec1ng regions the skeleton parts are connected to create an easy to use low DOF skeleton [c]
Similarly generalized cylinder surfaces are connected at connec1ng regions resul1ng in a water1ght mesh. [c]
The surface is then aJached to the skeleton by compu1ng smooth skin weights following the Pinnochio method of Baran and Popovic.
This skinning algorithm has two parts: bounding the surface ver1ces to bones of the skeleton and ensuring smoothness by solving a Laplacian system. The bounding for ver1ces are trivially known for ver1ces in cylindrical regions, so it only has to be computed for ver1ces on connec1ng regions.
The user can then combine the resul1ng model with an exis1ng one. [c] The surfaces and skeletons are merged [c], and the skin weights must be updated. While the same algorithm could be used again, it slows considerably as the complexity of the shape increases. [c] But observe that only the skin weights of ver1ces near the merge boundary, a small frac1on of all ver1ces are no1ceably affected. This allows for a local skin weight re-‐computa1on that greatly accelerates the process. [c]
Because of the 1me constraint, now I will talk about the details of the skeleton construc1on for the cylindrical regions, if interested the other steps can be found in our paper.
![Page 48: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/48.jpg)
Shape creation
8Thank you. So let’s see what’s going on behind the scenes.
As you’ve seen in the demo the user can sketch the silhoueJe of the desired 3D shape, and our system generates a surface composed of smoothly joined generalized cylinders, a skeleton, and skin weights aJaching the surface to the skeleton.
First The user’s sketched curve is closed and treated as a planar polygon
[click]
and then chordal axis transform is applied to this polygon, and by refining the results we obtain a decomposi1on into cylindrical regions [click] with well defined local symmetry and connec1ng regions lacking such symmetry. These regions are then treated in a different way.
For the cylindrical regions high quality skeletons are extracted using a modifica1on of the DP algorithm, [c] and generalized cylinder surfaces are created by using the 2D local symmetry axes as cylinder axes. [c]
Then using the informa1on from the connec1ng regions the skeleton parts are connected to create an easy to use low DOF skeleton [c]
Similarly generalized cylinder surfaces are connected at connec1ng regions resul1ng in a water1ght mesh. [c]
The surface is then aJached to the skeleton by compu1ng smooth skin weights following the Pinnochio method of Baran and Popovic.
This skinning algorithm has two parts: bounding the surface ver1ces to bones of the skeleton and ensuring smoothness by solving a Laplacian system. The bounding for ver1ces are trivially known for ver1ces in cylindrical regions, so it only has to be computed for ver1ces on connec1ng regions.
The user can then combine the resul1ng model with an exis1ng one. [c] The surfaces and skeletons are merged [c], and the skin weights must be updated. While the same algorithm could be used again, it slows considerably as the complexity of the shape increases. [c] But observe that only the skin weights of ver1ces near the merge boundary, a small frac1on of all ver1ces are no1ceably affected. This allows for a local skin weight re-‐computa1on that greatly accelerates the process. [c]
Because of the 1me constraint, now I will talk about the details of the skeleton construc1on for the cylindrical regions, if interested the other steps can be found in our paper.
![Page 49: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/49.jpg)
Shape creation
8Thank you. So let’s see what’s going on behind the scenes.
As you’ve seen in the demo the user can sketch the silhoueJe of the desired 3D shape, and our system generates a surface composed of smoothly joined generalized cylinders, a skeleton, and skin weights aJaching the surface to the skeleton.
First The user’s sketched curve is closed and treated as a planar polygon
[click]
and then chordal axis transform is applied to this polygon, and by refining the results we obtain a decomposi1on into cylindrical regions [click] with well defined local symmetry and connec1ng regions lacking such symmetry. These regions are then treated in a different way.
For the cylindrical regions high quality skeletons are extracted using a modifica1on of the DP algorithm, [c] and generalized cylinder surfaces are created by using the 2D local symmetry axes as cylinder axes. [c]
Then using the informa1on from the connec1ng regions the skeleton parts are connected to create an easy to use low DOF skeleton [c]
Similarly generalized cylinder surfaces are connected at connec1ng regions resul1ng in a water1ght mesh. [c]
The surface is then aJached to the skeleton by compu1ng smooth skin weights following the Pinnochio method of Baran and Popovic.
This skinning algorithm has two parts: bounding the surface ver1ces to bones of the skeleton and ensuring smoothness by solving a Laplacian system. The bounding for ver1ces are trivially known for ver1ces in cylindrical regions, so it only has to be computed for ver1ces on connec1ng regions.
The user can then combine the resul1ng model with an exis1ng one. [c] The surfaces and skeletons are merged [c], and the skin weights must be updated. While the same algorithm could be used again, it slows considerably as the complexity of the shape increases. [c] But observe that only the skin weights of ver1ces near the merge boundary, a small frac1on of all ver1ces are no1ceably affected. This allows for a local skin weight re-‐computa1on that greatly accelerates the process. [c]
Because of the 1me constraint, now I will talk about the details of the skeleton construc1on for the cylindrical regions, if interested the other steps can be found in our paper.
![Page 50: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/50.jpg)
Shape creation
8Thank you. So let’s see what’s going on behind the scenes.
As you’ve seen in the demo the user can sketch the silhoueJe of the desired 3D shape, and our system generates a surface composed of smoothly joined generalized cylinders, a skeleton, and skin weights aJaching the surface to the skeleton.
First The user’s sketched curve is closed and treated as a planar polygon
[click]
and then chordal axis transform is applied to this polygon, and by refining the results we obtain a decomposi1on into cylindrical regions [click] with well defined local symmetry and connec1ng regions lacking such symmetry. These regions are then treated in a different way.
For the cylindrical regions high quality skeletons are extracted using a modifica1on of the DP algorithm, [c] and generalized cylinder surfaces are created by using the 2D local symmetry axes as cylinder axes. [c]
Then using the informa1on from the connec1ng regions the skeleton parts are connected to create an easy to use low DOF skeleton [c]
Similarly generalized cylinder surfaces are connected at connec1ng regions resul1ng in a water1ght mesh. [c]
The surface is then aJached to the skeleton by compu1ng smooth skin weights following the Pinnochio method of Baran and Popovic.
This skinning algorithm has two parts: bounding the surface ver1ces to bones of the skeleton and ensuring smoothness by solving a Laplacian system. The bounding for ver1ces are trivially known for ver1ces in cylindrical regions, so it only has to be computed for ver1ces on connec1ng regions.
The user can then combine the resul1ng model with an exis1ng one. [c] The surfaces and skeletons are merged [c], and the skin weights must be updated. While the same algorithm could be used again, it slows considerably as the complexity of the shape increases. [c] But observe that only the skin weights of ver1ces near the merge boundary, a small frac1on of all ver1ces are no1ceably affected. This allows for a local skin weight re-‐computa1on that greatly accelerates the process. [c]
Because of the 1me constraint, now I will talk about the details of the skeleton construc1on for the cylindrical regions, if interested the other steps can be found in our paper.
![Page 51: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/51.jpg)
Shape creation
8Thank you. So let’s see what’s going on behind the scenes.
As you’ve seen in the demo the user can sketch the silhoueJe of the desired 3D shape, and our system generates a surface composed of smoothly joined generalized cylinders, a skeleton, and skin weights aJaching the surface to the skeleton.
First The user’s sketched curve is closed and treated as a planar polygon
[click]
and then chordal axis transform is applied to this polygon, and by refining the results we obtain a decomposi1on into cylindrical regions [click] with well defined local symmetry and connec1ng regions lacking such symmetry. These regions are then treated in a different way.
For the cylindrical regions high quality skeletons are extracted using a modifica1on of the DP algorithm, [c] and generalized cylinder surfaces are created by using the 2D local symmetry axes as cylinder axes. [c]
Then using the informa1on from the connec1ng regions the skeleton parts are connected to create an easy to use low DOF skeleton [c]
Similarly generalized cylinder surfaces are connected at connec1ng regions resul1ng in a water1ght mesh. [c]
The surface is then aJached to the skeleton by compu1ng smooth skin weights following the Pinnochio method of Baran and Popovic.
This skinning algorithm has two parts: bounding the surface ver1ces to bones of the skeleton and ensuring smoothness by solving a Laplacian system. The bounding for ver1ces are trivially known for ver1ces in cylindrical regions, so it only has to be computed for ver1ces on connec1ng regions.
The user can then combine the resul1ng model with an exis1ng one. [c] The surfaces and skeletons are merged [c], and the skin weights must be updated. While the same algorithm could be used again, it slows considerably as the complexity of the shape increases. [c] But observe that only the skin weights of ver1ces near the merge boundary, a small frac1on of all ver1ces are no1ceably affected. This allows for a local skin weight re-‐computa1on that greatly accelerates the process. [c]
Because of the 1me constraint, now I will talk about the details of the skeleton construc1on for the cylindrical regions, if interested the other steps can be found in our paper.
![Page 52: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/52.jpg)
Shape creation
8Thank you. So let’s see what’s going on behind the scenes.
As you’ve seen in the demo the user can sketch the silhoueJe of the desired 3D shape, and our system generates a surface composed of smoothly joined generalized cylinders, a skeleton, and skin weights aJaching the surface to the skeleton.
First The user’s sketched curve is closed and treated as a planar polygon
[click]
and then chordal axis transform is applied to this polygon, and by refining the results we obtain a decomposi1on into cylindrical regions [click] with well defined local symmetry and connec1ng regions lacking such symmetry. These regions are then treated in a different way.
For the cylindrical regions high quality skeletons are extracted using a modifica1on of the DP algorithm, [c] and generalized cylinder surfaces are created by using the 2D local symmetry axes as cylinder axes. [c]
Then using the informa1on from the connec1ng regions the skeleton parts are connected to create an easy to use low DOF skeleton [c]
Similarly generalized cylinder surfaces are connected at connec1ng regions resul1ng in a water1ght mesh. [c]
The surface is then aJached to the skeleton by compu1ng smooth skin weights following the Pinnochio method of Baran and Popovic.
This skinning algorithm has two parts: bounding the surface ver1ces to bones of the skeleton and ensuring smoothness by solving a Laplacian system. The bounding for ver1ces are trivially known for ver1ces in cylindrical regions, so it only has to be computed for ver1ces on connec1ng regions.
The user can then combine the resul1ng model with an exis1ng one. [c] The surfaces and skeletons are merged [c], and the skin weights must be updated. While the same algorithm could be used again, it slows considerably as the complexity of the shape increases. [c] But observe that only the skin weights of ver1ces near the merge boundary, a small frac1on of all ver1ces are no1ceably affected. This allows for a local skin weight re-‐computa1on that greatly accelerates the process. [c]
Because of the 1me constraint, now I will talk about the details of the skeleton construc1on for the cylindrical regions, if interested the other steps can be found in our paper.
![Page 53: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/53.jpg)
Shape creation
8Thank you. So let’s see what’s going on behind the scenes.
As you’ve seen in the demo the user can sketch the silhoueJe of the desired 3D shape, and our system generates a surface composed of smoothly joined generalized cylinders, a skeleton, and skin weights aJaching the surface to the skeleton.
First The user’s sketched curve is closed and treated as a planar polygon
[click]
and then chordal axis transform is applied to this polygon, and by refining the results we obtain a decomposi1on into cylindrical regions [click] with well defined local symmetry and connec1ng regions lacking such symmetry. These regions are then treated in a different way.
For the cylindrical regions high quality skeletons are extracted using a modifica1on of the DP algorithm, [c] and generalized cylinder surfaces are created by using the 2D local symmetry axes as cylinder axes. [c]
Then using the informa1on from the connec1ng regions the skeleton parts are connected to create an easy to use low DOF skeleton [c]
Similarly generalized cylinder surfaces are connected at connec1ng regions resul1ng in a water1ght mesh. [c]
The surface is then aJached to the skeleton by compu1ng smooth skin weights following the Pinnochio method of Baran and Popovic.
This skinning algorithm has two parts: bounding the surface ver1ces to bones of the skeleton and ensuring smoothness by solving a Laplacian system. The bounding for ver1ces are trivially known for ver1ces in cylindrical regions, so it only has to be computed for ver1ces on connec1ng regions.
The user can then combine the resul1ng model with an exis1ng one. [c] The surfaces and skeletons are merged [c], and the skin weights must be updated. While the same algorithm could be used again, it slows considerably as the complexity of the shape increases. [c] But observe that only the skin weights of ver1ces near the merge boundary, a small frac1on of all ver1ces are no1ceably affected. This allows for a local skin weight re-‐computa1on that greatly accelerates the process. [c]
Because of the 1me constraint, now I will talk about the details of the skeleton construc1on for the cylindrical regions, if interested the other steps can be found in our paper.
![Page 54: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/54.jpg)
Shape creation
8Thank you. So let’s see what’s going on behind the scenes.
As you’ve seen in the demo the user can sketch the silhoueJe of the desired 3D shape, and our system generates a surface composed of smoothly joined generalized cylinders, a skeleton, and skin weights aJaching the surface to the skeleton.
First The user’s sketched curve is closed and treated as a planar polygon
[click]
and then chordal axis transform is applied to this polygon, and by refining the results we obtain a decomposi1on into cylindrical regions [click] with well defined local symmetry and connec1ng regions lacking such symmetry. These regions are then treated in a different way.
For the cylindrical regions high quality skeletons are extracted using a modifica1on of the DP algorithm, [c] and generalized cylinder surfaces are created by using the 2D local symmetry axes as cylinder axes. [c]
Then using the informa1on from the connec1ng regions the skeleton parts are connected to create an easy to use low DOF skeleton [c]
Similarly generalized cylinder surfaces are connected at connec1ng regions resul1ng in a water1ght mesh. [c]
The surface is then aJached to the skeleton by compu1ng smooth skin weights following the Pinnochio method of Baran and Popovic.
This skinning algorithm has two parts: bounding the surface ver1ces to bones of the skeleton and ensuring smoothness by solving a Laplacian system. The bounding for ver1ces are trivially known for ver1ces in cylindrical regions, so it only has to be computed for ver1ces on connec1ng regions.
The user can then combine the resul1ng model with an exis1ng one. [c] The surfaces and skeletons are merged [c], and the skin weights must be updated. While the same algorithm could be used again, it slows considerably as the complexity of the shape increases. [c] But observe that only the skin weights of ver1ces near the merge boundary, a small frac1on of all ver1ces are no1ceably affected. This allows for a local skin weight re-‐computa1on that greatly accelerates the process. [c]
Because of the 1me constraint, now I will talk about the details of the skeleton construc1on for the cylindrical regions, if interested the other steps can be found in our paper.
![Page 55: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/55.jpg)
Skeletonization
9The 3D surface is created by using the 2D local symmetry axes of the cylindrical regions as the axes of generalized cylinders. This is the surface for which we need a bone skeleton. It should obviously have a linear structure, so the ques1on remains how many joints should we have and where should they be placed
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Skeletonization
10An easy solu1on would be having a single bone for the en1re cylindrical region. But this way the whole cylindrical region stays rigid, we can only pose it rela1vely to the other parts of the shape
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Skeletonization
11The other extremum is having many joints and this way many degrees of freedom.
But then posing becomes tedious using forward kinema1cs, and if we use IK, deforma1ons may occur in regions that we would want to stay rigid.
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Skeletonization
12So we have to find a balance between these extrema, we have to find a tradeoff between usability and the number of degrees of freedom
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Skeletonization
13So what do we have to work with? For each cylindrical region the local symmetry is described by the chords and the chordal axis.
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Skeletonization
chordal axis
14The chordal axis is an approxima1on of the local symmetry axis
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Skeletonization
chord
15And the chords tell us the thickness of the region along the axis
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Skeletonization
16The end points of the chords are approximately symmetric point pairs on the sketch.
The chordal axis represents well the 3D surface, so we use it for crea1ng the bone-‐skeleton.
Since bones are straight, parts of the shape corresponding to a single bone should also be roughly straight.
The bone skeleton then can be constructed by down sampling the chordal axis to line segments. A popular algorithm for such poly-‐line simplifica1on is the DP algorithm
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Douglas-Peucker algorithm
17Recall, the DP algorithm is a greedy recursive algorithm.
It down samples the input poly line represented by a series of points, such that all of the original points lie within a predetermined error threshold of the resul1ng poly line
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Douglas-Peucker algorithm
18A line segment is fit between the first and last points
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Douglas-Peucker algorithm
19If not all the points are within the threshold of this segment
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Douglas-Peucker algorithm
20The point farthest from the line segment is chosen and two recursive calls are made, for the parts before and aTer the chosen point
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Douglas-Peucker algorithm
21
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Douglas-Peucker algorithm
22
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Douglas-Peucker algorithm
23
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Douglas-Peucker algorithm
24
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Douglas-Peucker algorithm
25
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Douglas-Peucker algorithm
26When all points are within the threshold
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Douglas-Peucker algorithm
27The algorithm stops, and we can use the resul1ng line segments as the bones of the skeleton
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What happens if…
28But life is not always that simple and we might have a shape like this
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…the chordal axis is almost straight
29Where the chordal axis is almost straight, but the thickness varies substan1ally along the chordal axis
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Result of Douglas-Peucker
30Applying DP would result in a single line segment, therefore the skeleton would have a single bone, even though we feel that a shape like this does in fact have two parts, and therefore the skeleton should have two bones connected at a joint at the minimum thickness
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Result of Douglas-Peucker
31We can lower the error threshold to get more line segments, but the addi1onal joints are not placed at the desired loca1on
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Result of Douglas-Peucker
32But instead at sort of random loca1ons according to noise and slight perturba1ons in the chordal axis. This shouldn’t really be a surprise, since we didn’t use informa1on on the thickness
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Use thickness (chords)
33So to alleviate this problem we extended the DP algorithm to also use thickness informa1on from the chords. So instead of approxima1ng the chordal axis with a poly line we are approxima1ng the en1re cylindrical region with symmetric trapezoids.
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Fit line segment
34So the recursive func1on is modified in the following way:
First a line segment is fit between the midpoints of the first and last chords
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Fit trapezoid
35And then a symmetric trapezoid is also added using the line segment as its symmetry axis, and the bases of the trapezoid are determined by projec1ng the first and last chords onto the normal direc1on of the segment.
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Fit trapezoid
36Then we have to evaluate if it this trapezoid is a good approxima1on of the cylindrical region.
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Cylindrical Douglas-Peucker error
37We define the error at each chord as the sum of the squared distances between the end points of the chord and the two sides of the trapezoid.
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Cylindrical Douglas-Peucker error
38We compute the error at each chord
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Cylindrical Douglas-Peucker error
39
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Cylindrical Douglas-Peucker error
40
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Cylindrical Douglas-Peucker error
41
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Cylindrical Douglas-Peucker error
42
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Cylindrical Douglas-Peucker error
43
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Cylindrical Douglas-Peucker error
44
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Cylindrical Douglas-Peucker error
45
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Cylindrical Douglas-Peucker error
46
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Cylindrical Douglas-Peucker error
47
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Cylindrical Douglas-Peucker error
48If the maximum is greater than the predefined threshold
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Add new point
49Then we take the midpoint of the chord, and recursively call for the parts before and aTer this chord
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Fit trapezoids
50We fit trapezoids again
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Error below threshold
51And if the errors are below the threshold, the algorithm terminates
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Bones
52and the axes of the trapezoids are used as the bones of the skeleton
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53So using the CDP algorithm we create the skeleton for each cylindrical region. [c] For details on other steps, please see our paper.
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53So using the CDP algorithm we create the skeleton for each cylindrical region. [c] For details on other steps, please see our paper.
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Results
54So this way users can easily create complex posed models.
They don’t have to worry about crea1ng the rig, the skeleton and skin weights are constructed automa1cally with the shape, and maintained during the modeling process, so they can really concentrate on the design of the individual parts; which can be re-‐used like in the case of the squid example in the middle. Users can pose the shape while modeling, and thanks to the local re-‐skinning the modeling flow is never interrupted.
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Results (reusing existing models)
55An other advantage of modeling by parts is that users can combine exis1ng models, they can quickly try out different ideas without any pausing due to rigging.
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Results (1st time users)
56Users don’t have to be professional modelers to be able to create rigged shapes. The models you see here were created by first 1me users aTer a 15 minute training session.
![Page 104: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/104.jpg)
Limitations
57Of course our system has limita1ons as well:
It can only handle acyclic skeletons, new shapes always have spherical genus, and are therefore created with tree like skeletons, and merging always occurs at a single joint.
Objects without strong, stable axial symmetry cannot be created with a single sketch. For example the head of the squid from the examples could not be created with a single sketch, but instead
we had to introduce a workaround: sketch a longer shape with a well defined symmetry axis and then cut off the extra material.
Avenues for future work include adap1ng our skin weight recomputa1on for more advanced skinning methods.
And an interes1ng yet non-‐trivial extension is including anima1on in the unified pipeline, such that changes to the model are instantaneously reflected in the anima1on.
We are in fact currently working on it.
This concludes are talk,
![Page 105: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/105.jpg)
Limitations
Only acyclic skeletons
57Of course our system has limita1ons as well:
It can only handle acyclic skeletons, new shapes always have spherical genus, and are therefore created with tree like skeletons, and merging always occurs at a single joint.
Objects without strong, stable axial symmetry cannot be created with a single sketch. For example the head of the squid from the examples could not be created with a single sketch, but instead
we had to introduce a workaround: sketch a longer shape with a well defined symmetry axis and then cut off the extra material.
Avenues for future work include adap1ng our skin weight recomputa1on for more advanced skinning methods.
And an interes1ng yet non-‐trivial extension is including anima1on in the unified pipeline, such that changes to the model are instantaneously reflected in the anima1on.
We are in fact currently working on it.
This concludes are talk,
![Page 106: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/106.jpg)
Limitations
Only acyclic skeletons
Objects without strong, stable axial symmetry
57Of course our system has limita1ons as well:
It can only handle acyclic skeletons, new shapes always have spherical genus, and are therefore created with tree like skeletons, and merging always occurs at a single joint.
Objects without strong, stable axial symmetry cannot be created with a single sketch. For example the head of the squid from the examples could not be created with a single sketch, but instead
we had to introduce a workaround: sketch a longer shape with a well defined symmetry axis and then cut off the extra material.
Avenues for future work include adap1ng our skin weight recomputa1on for more advanced skinning methods.
And an interes1ng yet non-‐trivial extension is including anima1on in the unified pipeline, such that changes to the model are instantaneously reflected in the anima1on.
We are in fact currently working on it.
This concludes are talk,
![Page 107: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/107.jpg)
Limitations
Only acyclic skeletons
Objects without strong, stable axial symmetry
57Of course our system has limita1ons as well:
It can only handle acyclic skeletons, new shapes always have spherical genus, and are therefore created with tree like skeletons, and merging always occurs at a single joint.
Objects without strong, stable axial symmetry cannot be created with a single sketch. For example the head of the squid from the examples could not be created with a single sketch, but instead
we had to introduce a workaround: sketch a longer shape with a well defined symmetry axis and then cut off the extra material.
Avenues for future work include adap1ng our skin weight recomputa1on for more advanced skinning methods.
And an interes1ng yet non-‐trivial extension is including anima1on in the unified pipeline, such that changes to the model are instantaneously reflected in the anima1on.
We are in fact currently working on it.
This concludes are talk,
![Page 108: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/108.jpg)
Limitations
Only acyclic skeletons
Objects without strong, stable axial symmetry
57Of course our system has limita1ons as well:
It can only handle acyclic skeletons, new shapes always have spherical genus, and are therefore created with tree like skeletons, and merging always occurs at a single joint.
Objects without strong, stable axial symmetry cannot be created with a single sketch. For example the head of the squid from the examples could not be created with a single sketch, but instead
we had to introduce a workaround: sketch a longer shape with a well defined symmetry axis and then cut off the extra material.
Avenues for future work include adap1ng our skin weight recomputa1on for more advanced skinning methods.
And an interes1ng yet non-‐trivial extension is including anima1on in the unified pipeline, such that changes to the model are instantaneously reflected in the anima1on.
We are in fact currently working on it.
This concludes are talk,
![Page 109: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/109.jpg)
Limitations
Only acyclic skeletons
Objects without strong, stable axial symmetry
57Of course our system has limita1ons as well:
It can only handle acyclic skeletons, new shapes always have spherical genus, and are therefore created with tree like skeletons, and merging always occurs at a single joint.
Objects without strong, stable axial symmetry cannot be created with a single sketch. For example the head of the squid from the examples could not be created with a single sketch, but instead
we had to introduce a workaround: sketch a longer shape with a well defined symmetry axis and then cut off the extra material.
Avenues for future work include adap1ng our skin weight recomputa1on for more advanced skinning methods.
And an interes1ng yet non-‐trivial extension is including anima1on in the unified pipeline, such that changes to the model are instantaneously reflected in the anima1on.
We are in fact currently working on it.
This concludes are talk,
![Page 110: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/110.jpg)
Limitations
Only acyclic skeletons
Objects without strong, stable axial symmetry
57Of course our system has limita1ons as well:
It can only handle acyclic skeletons, new shapes always have spherical genus, and are therefore created with tree like skeletons, and merging always occurs at a single joint.
Objects without strong, stable axial symmetry cannot be created with a single sketch. For example the head of the squid from the examples could not be created with a single sketch, but instead
we had to introduce a workaround: sketch a longer shape with a well defined symmetry axis and then cut off the extra material.
Avenues for future work include adap1ng our skin weight recomputa1on for more advanced skinning methods.
And an interes1ng yet non-‐trivial extension is including anima1on in the unified pipeline, such that changes to the model are instantaneously reflected in the anima1on.
We are in fact currently working on it.
This concludes are talk,
![Page 111: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/111.jpg)
Limitations
Only acyclic skeletons
Objects without strong, stable axial symmetry
57Of course our system has limita1ons as well:
It can only handle acyclic skeletons, new shapes always have spherical genus, and are therefore created with tree like skeletons, and merging always occurs at a single joint.
Objects without strong, stable axial symmetry cannot be created with a single sketch. For example the head of the squid from the examples could not be created with a single sketch, but instead
we had to introduce a workaround: sketch a longer shape with a well defined symmetry axis and then cut off the extra material.
Avenues for future work include adap1ng our skin weight recomputa1on for more advanced skinning methods.
And an interes1ng yet non-‐trivial extension is including anima1on in the unified pipeline, such that changes to the model are instantaneously reflected in the anima1on.
We are in fact currently working on it.
This concludes are talk,
![Page 112: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/112.jpg)
Only acyclic skeletons
Objects without strong, stable axial symmetry
Limitations & Future work
57Of course our system has limita1ons as well:
It can only handle acyclic skeletons, new shapes always have spherical genus, and are therefore created with tree like skeletons, and merging always occurs at a single joint.
Objects without strong, stable axial symmetry cannot be created with a single sketch. For example the head of the squid from the examples could not be created with a single sketch, but instead
we had to introduce a workaround: sketch a longer shape with a well defined symmetry axis and then cut off the extra material.
Avenues for future work include adap1ng our skin weight recomputa1on for more advanced skinning methods.
And an interes1ng yet non-‐trivial extension is including anima1on in the unified pipeline, such that changes to the model are instantaneously reflected in the anima1on.
We are in fact currently working on it.
This concludes are talk,
![Page 113: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/113.jpg)
Only acyclic skeletons
Objects without strong, stable axial symmetry
Limitations & Future work
57Of course our system has limita1ons as well:
It can only handle acyclic skeletons, new shapes always have spherical genus, and are therefore created with tree like skeletons, and merging always occurs at a single joint.
Objects without strong, stable axial symmetry cannot be created with a single sketch. For example the head of the squid from the examples could not be created with a single sketch, but instead
we had to introduce a workaround: sketch a longer shape with a well defined symmetry axis and then cut off the extra material.
Avenues for future work include adap1ng our skin weight recomputa1on for more advanced skinning methods.
And an interes1ng yet non-‐trivial extension is including anima1on in the unified pipeline, such that changes to the model are instantaneously reflected in the anima1on.
We are in fact currently working on it.
This concludes are talk,
![Page 114: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/114.jpg)
Only acyclic skeletons
Objects without strong, stable axial symmetry
Limitations & Future work
57Of course our system has limita1ons as well:
It can only handle acyclic skeletons, new shapes always have spherical genus, and are therefore created with tree like skeletons, and merging always occurs at a single joint.
Objects without strong, stable axial symmetry cannot be created with a single sketch. For example the head of the squid from the examples could not be created with a single sketch, but instead
we had to introduce a workaround: sketch a longer shape with a well defined symmetry axis and then cut off the extra material.
Avenues for future work include adap1ng our skin weight recomputa1on for more advanced skinning methods.
And an interes1ng yet non-‐trivial extension is including anima1on in the unified pipeline, such that changes to the model are instantaneously reflected in the anima1on.
We are in fact currently working on it.
This concludes are talk,
![Page 115: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/115.jpg)
Only acyclic skeletons
Objects without strong, stable axial symmetry
Limitations & Future work
57Of course our system has limita1ons as well:
It can only handle acyclic skeletons, new shapes always have spherical genus, and are therefore created with tree like skeletons, and merging always occurs at a single joint.
Objects without strong, stable axial symmetry cannot be created with a single sketch. For example the head of the squid from the examples could not be created with a single sketch, but instead
we had to introduce a workaround: sketch a longer shape with a well defined symmetry axis and then cut off the extra material.
Avenues for future work include adap1ng our skin weight recomputa1on for more advanced skinning methods.
And an interes1ng yet non-‐trivial extension is including anima1on in the unified pipeline, such that changes to the model are instantaneously reflected in the anima1on.
We are in fact currently working on it.
This concludes are talk,
![Page 116: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/116.jpg)
Only acyclic skeletons
Objects without strong, stable axial symmetry
Adapt for improved skinning methods
Limitations & Future work
57Of course our system has limita1ons as well:
It can only handle acyclic skeletons, new shapes always have spherical genus, and are therefore created with tree like skeletons, and merging always occurs at a single joint.
Objects without strong, stable axial symmetry cannot be created with a single sketch. For example the head of the squid from the examples could not be created with a single sketch, but instead
we had to introduce a workaround: sketch a longer shape with a well defined symmetry axis and then cut off the extra material.
Avenues for future work include adap1ng our skin weight recomputa1on for more advanced skinning methods.
And an interes1ng yet non-‐trivial extension is including anima1on in the unified pipeline, such that changes to the model are instantaneously reflected in the anima1on.
We are in fact currently working on it.
This concludes are talk,
![Page 117: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/117.jpg)
Only acyclic skeletons
Objects without strong, stable axial symmetry
Adapt for improved skinning methods
Include anima>on in the unified pipeline
Limitations & Future work
57Of course our system has limita1ons as well:
It can only handle acyclic skeletons, new shapes always have spherical genus, and are therefore created with tree like skeletons, and merging always occurs at a single joint.
Objects without strong, stable axial symmetry cannot be created with a single sketch. For example the head of the squid from the examples could not be created with a single sketch, but instead
we had to introduce a workaround: sketch a longer shape with a well defined symmetry axis and then cut off the extra material.
Avenues for future work include adap1ng our skin weight recomputa1on for more advanced skinning methods.
And an interes1ng yet non-‐trivial extension is including anima1on in the unified pipeline, such that changes to the model are instantaneously reflected in the anima1on.
We are in fact currently working on it.
This concludes are talk,
![Page 118: RigMesh: Automatic Rigging for Part-Based Shape Modeling ...game.engineering.nyu.edu/mingUploads/rigmesh_siggraph_asia_talk_… · RigMesh: Automatic Rigging for Part-Based Shape](https://reader034.vdocument.in/reader034/viewer/2022042223/5ec9a05c19c36801164fcf02/html5/thumbnails/118.jpg)
Thank you!
58Thank you for your aJen1on