OpenGL uses several matrices to transform geometry and associated data. Those matrices are:
- Modelview – places object geometry in the global, unprojected space
- Projection – projects global coordinates into clip space; you may think of it as kind of a lens
- Texture – adjusts texture coordinates before; mostly used to implement texture projection (i.e. projecting a texture as if it was a slide in a projector)
- Color – adjusts the vertex colors. Seldomly touched at all
OpenGL: What is MatrixMode?
原文：http://www.cnblogs.com/splashbrother/p/4701319.html
