[away3d] color each triangles of a Plane in a different color

[fdb]

Hello, I'd like to know the most efficient way to color each triangles
of a Plane in a different color or most generally each triangle of any
surface of a primitive.


I know how to color a certain side of a primitives:

cube.cubeMaterials.left = new ColorMaterial(0xffffff);

but not a specific triangle.

Is there a way to point to this triangle ?