The front face of a triangle is defined by the order of the vertices.
The "right hand rule" should work for you.  Curl your fingers of your
right hand in the order of the vertices and your thumb will point out
from the front face.  Or in other words, assign your vertices in counter
clockwise order as you face the object.

- John Wright
Starfire Research

Saeed Ansari wrote:
Hi all, I have draw a lot of shapes containing concave and convex
shapes. The problem is that many shapes' face are in front of the
viewer and others back of the viewer. How can I define front face of
the shapes ?

Regards, Saeed

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