[Feng yuchong] The shader of the unity3d tutorial book: The sixth lecture on texgen

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                     Shader 6: texgen
Texgen: Mainly used for fixed function shader to automatically generate the UV of some target effects. Vertex functions are automatically ignored. This function directly corresponds to the OpenGL texgen
Modes. The following modes are available:Objectlinear,Eyelinear,Spheremap,Cubereflect,Cubenormal
;

1. Shader "texgen "{
2.  Properties {
3.  _ Maintex ("base", 2d) = "white" {texgen eyelinear}
4.  // 2D and cube textures can be used.
5.  //
   _ Tex ("cube", cube) = "white" {texgen eyelinear}
6.  }
7. Subshader {
8. Pass {
9. Settexture [_ maintex] {combine texture}
10. }
11. }
12. }