The Cg Tutorial: The Definitive Guide to Programmable Real-Time Graphics

Chapter 9. Advanced Topics

This chapter covers advanced Cg usage and has the following five sections:

• “Fog” describes how to simulate a common atmospheric effect that looks like fog.

• “Nonphotorealistic Rendering” describes a field of rendering that focuses on stylized images, and it gives an example in the form of cartoon shading.

• “Projective Texturing” explains the theory and practice of projecting textures onto geometry.

• “Shadow Mapping” shows a common way to add shadows to your scenes, based on projective texturing.

• “Compositing” describes how to leverage the GPU’s powerful texture mapping capabilities to combine images.

Fog

Fog, an atmospheric effect created by condensed water vapor, obscures visibility. Haze, mist, and smoke are similar phenomena ...