After creating the cube, use VertexColor to set the vertex colors for the cube:
Another way is texturing the cube so, that one side is red. For this, easiest is to create the cube in a 3d editor.
surf = GetSurface(cube, 1) VertexColor surf, 0, 255, 0, 0 VertexColor surf, 1, 255, 0, 0 VertexColor surf, 2, 255, 0, 0 VertexColor surf, 3, 255, 0, 0 EntityFX cube, 2
Another way is texturing the cube so, that one side is red. For this, easiest is to create the cube in a 3d editor.