OpenSCAD User Manual/First Steps/Changing the color of an object

Any object, or a group of them, may be colored by preceding the object module call with the color() operator module.

There are two ways to specify the color to set:

RGB vector

three floats in the range [0.0:1.0] in a three element vector [<redval>,<greenval>,<blueval>]

"<colorname>"

a string containing a color name from the list of Web Colors.

Usage example 1 - changing the color of an object:
color([1,0,0]) cube([2,3,4]); translate([3,0,0]) color([0,1,0]) cube([2,3,4]); translate([6,0,0]) color([0,0,1]) cube([2,3,4]);	OpenSCAD changing the color of an object

A color() operator may be included, the same as any other operator, like translate(), in a stack of operators that precede call to an object module.

Using braces ("{}") to define a level of scope will apply color, or any other operator module, to all of the objects included in the scope

color([0,0,1]) {
    translate([6,0,0])
       cube([2,3,4]);
    translate([-6,0,0])
       cube([2,3,4]);
    }

In a stack of operators the first call to color() overrides all others that come later.