CIS 563: Physically based animation

Ladislav Kavan

Final Projects

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Final Project - What is it?· A project of your choice

- groups of 1-3 people (of course we expect larger project from bigger team)

- can use existing code (but you have to clearly state it)- you will also need to implement your own physically-based-

related code- discuss project ideas on Piazza – it’s a good idea to have the topic

approved by instructors or TAs- topics are not exclusive, multiple teams can work on the same

topic

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CIS563 Grade· 55% homework· 40% final project· 5% class / piazza participation

Bottom line:· More important than grade is your demo reel· Career: industry / academia (PhD) / startup

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Important Dates03/30: Teams Formed and Project Topic Decided. Submit to Canvas (everyone).

04/27: Final Projects due (writeup + code + video).

Late days do not apply to final projects.

04/27 & 04/29: Final Project presentations (in class).

04/29: Last day of classes

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Task 1: Project Topic & Team· Project title & abstract (1 paragraph)· Include names of all team members· All team members are equal, all submit the

same short document on Canvas

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Previous Final Projects· Ying: http://youtu.be/OC58YkYvmHQ

· Xinjie: https://youtu.be/DR5F7xzcCuo

· Sijie: https://www.youtube.com/watch?v=52_gbQDSmho

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Projects can kickstart your thesis· Research-type projects· CIS 563 Final project can be used as

springboard for Master’s thesis project· Re-using your final project code, data, models

etc. is allowed· Unique opportunity to try research

· Without having to commit to a PhD program· Nathan Marshak: http://youtu.be/cBVCbSq_7rI

Research-type projects

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Parallel Fast-mass Springs

https://www.youtube.com/watch?v=N520KFOxaDg

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Corotated elasticity using quaternions

· Might be more accurate than matrix-based corot elasticity due to the double cover property

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Simulation of living tissuesSurgical simulation- Very interesting materials- How to simulate e.g. connective tissues?

https://www.youtube.com/watch?v=8tepFfxTaZw

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iLarynx++: Intubation Simulatorhttps://www.youtube.com/watch?v=d62JdxyscNI

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Skinning Mesh AnimationsApproximate animation using skinning· Used a lot in the industry· Compression of pre-baked phys-based

animations

https://www.youtube.com/watch?v=e0rugcfR8K4

Production-type projects

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Topics: general recipePick a paper (typically SIGGRAPH or SCA)· Variational integrators· Cloth with self-collisions· Rigid body simulation (will be covered in class)· Finite element elasticity (will be covered in class)· Control of articulated characters· PIC and FLIP fluid simulation· Level-set methods and water simulation· Hair simulation· Fire and explosions

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Unified particle physics· Based on PBD ideas, but more general

https://www.youtube.com/watch?v=ffgRC3kvA_k

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Symplectic integrators· Better energy preservation· Read related papers from Caltech (e.g.

[Kharevych et al. 06])· Good for math/physics nerds

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Cloth with self-collisions· PBD or mass-spring· Detect and respond to self-collisions

Seminal paper:Robust Treatment of Collisions, Contact and Friction for Cloth Animation (Bridson, Fedkiw, Anderson, 2002)

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Control of articulated characters· Use existing rigid body simulator

SIMBICON: Simple Biped Locomotion Control, Kangkang Yin, Kevin Loken, Michiel van de Panne SIGGRAPH 2007

More recent work by Stelian Coros

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PIC and FLIP fluid simulationHybrid particle/grid methods· Used in industrial simulators

Animating Sand as a Fluid, Yongning Zhu, Robert Bridson, SIGGRAPH 2005

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Level set methods and waterPractical Animation of Liquids, Nick Foster, Ronald Fedkiw, SIGGRAPH 2001

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Hair simulationA Mass Spring Model for Hair Simulation, Selle, Lentine, Fedkiw, 2008

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Fire and Explosions· “Physically Based Modeling and Animation

of Fire” by Nguyen, Fedkiw, Jensen

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Make your own topicLook at recent SIGGRAPH papers

http://kesen.realtimerendering.com/

Caveat: not always easy to implement· Sometimes a lot of background is needed· Ask for advice (how hard is it?)