Introduction - If you have any usage issues, please Google them yourself
The program implementation of the graphics in the classic bump texture mapping algorithm. Bump texture mapping is a texture blending method, which can create three-dimensional objects the appearance of complex surface texture. Ordinary texture mapping can simulate three-dimensional objects relatively smooth surface, it is difficult to show that the surface of ups and downs, uneven results. Bump texture mapping can express through a convex surface of a high degree of plan [known as the bump texture], to another environment, said mapping surface texture map texture coordinates corresponding interference, through interference with texture coordinates will be applied to environment mapping, resulting in uneven display.