= Bump Map =
 * [http://developer.nvidia.com/object/Practical_Bumpmapping_Tech.html nvida: A Practical and Robust Bump-mapping Technique]
 * [http://developer.nvidia.com/object/bump_skin.html How to Bump Map a Skinned Polygonal Model]
 * [http://developer.nvidia.com/object/texture_space_bump_mapping.html Texture Space Bump Mapping] - very good