Even Number of Triangles for Any 3D model

Sage
Posts: 1,403
Joined: 2005.07
Post: #1
Is it impossible for a 3D model to have an odd number of triangles?
Assuming its got every edge has two triangles.

Sir, e^iπ + 1 = 0, hence God exists; reply!
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Member
Posts: 131
Joined: 2004.10
Post: #2
If the surface is properly formed, no (I think); but if it has degenerate triangles, meaning two or more of a triangle's points are coincident, then all bets are off.

I'm still trying to think of a case where it may fail but I'm not finding it.
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