Sprite Rendering

Games, Interaction and Robotics 2011

The Game Loop

Process Input

Update World

Render

Synthesis vs Analysis

Model Image

ComputerGraphics

ComputerVision

Rendering Steps

• A virtual scene is described, usually in terms of 3D surfaces in mathematical form.

• A virtual camera is positioned and oriented to produce the desired view of the scene.

• Various light sources are defined.

• The visual properties of the surfaces in the scene are described.

• The render equation is solved.

Chapter 10. Game Engine Architecture, 2009, A K Peters, Ltd.

Triangle Meshes

An example of a polygon mesh. Chrschn, 2007.

Texture Mapping

A depiction of how UV-Mapping works, showing the classic example of mapping a globe. Drawing by TSchmits, 2008.

3D Projection

Principle of the geometrical perspective projection. Drawing by Joachim Baecker, 2005.

Coordinate Systems

Handedness cartesian coordinate system in 3D. Gustavb, 2006.

Left-Handed Right-Handed

What’s in a Sprite?

What’s in a Sprite?

Transformation Matrix

Transformation Matrix

Transformation Matrix

Transformation Matrix

Composite Transformation

Orthographic Projection

• Projection lines orthogonal to projection plane.

• Distance to viewpoint does not decrease apparent size of object.

Rendering Sprites

Bibliography

1. Game Engine Architecture, Jason Gregory, 2009, A K Peters, Ltd.

2. OpenGL® Programming Guide: The Official Guide to Learning OpenGL®, Version 2.1, 6th Edition, 2007, Addison-Wesley Professional