Blender Tutorial - Baking textures (faking shadows)

In this one, you'll find something that will free you from about 11 useless render hours. You only need to calculate the shadow once, instead of every frame. (That is, if your mesh is not moving...)

Blender: Caterpillar of tank

Caterpillar of tank. Animated in Blender 2.44

Adobe After Effects - Keylight

This is a tutorial on Keylight. That is a plugin to After Effects.