I am trying to draw some (rotatable) surfaces (say, a blanket) in 3D and I want either side of the surface to have a different color. One logical limit of this is to draw a single triangle with a different color on either side. I can’t do this.
I can use culling and get no back surface, and I can use glPolygonMode(GL_BACK, GL_LINES) and get wire-frame, but I cannot get a different color there.
I have tried glColorMaterial(GL_BACK, GL_AMBIENT_AND_DIFFUSE) glColor3f(1.0,0.0,0.0), and a variety of other methods. The back always comes out the same color as the front.
There is something here I don’t understand. Help,