material_map texture
// texture attribute
// create a texture that maps different textures onto different color indexes
// image maps into X-Y plane from <0,0,0> to <1,1,0>
material_map {
png plasma3.png // the file to read (iff/tga/gif/png/jpeg/tiff/sys)
map_type 0 // 0=planar, 1=spherical, 2=cylindrical, 5=torus
interpolate 2 // 0=none, 1=linear, 2=bilinear, 4=normalized distance
// once // for no repetitive tiling
texture { pigment {wood} } // texture for color index # 0
texture { pigment {granite} } // texture for color index # 1
texture { pigment {agate} } // texture for color index # 2
// etc...
} // material_map