3D graph - Patch function

Hi.

I am using the patch function to build a 3d graph, but i want only one side of every patch to be colored and not both. Can someone help me?

[Matt Tearle]

A patch is a 2-D polygon in a 2-D or 3-D space -- what do you mean by "one side" to be colored, but not "both"? The "sides" of a polygon are the edges around the perimeter (of which there have to be at least three).

[dimi mouhta]

sorry, i mean only one face to be colored.

[Walter Roberson]

Matt, patches are not restricted to 2-D polygons. The vertices of any one face in a patch do not need to be co-planar.

Answer 1

[Walter Roberson]

dimi, how should the second side appear? Should it be like "one way glass", clear when you look at it from one direction but colored when you look at it from the other direction?

Is what you are trying to do something that could be achieved by lighting effects -- e.g., placing a light inside the polyhedra but no light outside?

[dimi mouhta]

i just want it to be different. I want to color the front faces (the front face is defined by the polygon normal), using FaceVertexCData and the back faces can be a flat color (grey), or a glass, as you mentioned. How can i do this?