Example of labels in Raster3D/ghostscript
64 70     tiles in x,y
 8  8     pixels (x,y) per tile
4         anti-aliasing
0 0.05 0   background colour
T         no shadows cast
25        Phong power
0.15      secondary light contribution
0.05      ambient light contribution
0.25      specular reflection component
4.0       eye position
1 1 1     main light source position
1 0 0 0   input coordinate, radius transformation
0 1 0 0
0 0 1 0
0 0 0 1.5
3         mixed objects
*
*
*
