material.color attribute

float material.color.{r|g|b}
string material.color.rgb

The material.color shape attribute controls the diffuse color. In CGA, colors are always in non-linear sRGB.

Related

materialattribute setoperation coloroperation resetMaterialoperation setMaterialoperation getMaterialfunction

Examples

Rainbow building

color cycle 
Lot-->
   extrude(20)
   set(material.color.g, 0)
   split(x) {
     2 : set(material.color.r, split.index/split.total)
        set(material.color.b, 1.0 - split.index/split.total)
        X
   }*

The split index is used to generate position dependent colors.