Crash when painting triangle because of degenerate triangles about pepr3d HOT 6 CLOSED

The model contains a triangle with 0 surface area - a degenerate triangle which is basically a line segment. This is either due to wrong import code, or faulty input from the user.

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Also, the app does not crash in release, only behaves weirdly because of the zero-surface area triangle.

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@Arokip aiProcess_Triangulate states:

This post processing step splits up faces with more than 3 indices into triangles. Line and point primitives are not modified!

Are you sure you are not importing line primitives as triangles? I am almost sure, but not quite.

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Removing the 0 surface area triangle while importing solves the issue and the CGAL assertion does not fire.

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@Arokip Might be worth using http://assimp.sourceforge.net/lib_html/postprocess_8h.html

aiProcess_FindDegenerates

2. (if you don't support lines and points at all)
   Specify the aiProcess_FindDegenerates flag.
   Specify the aiProcess_SortByPType flag. This moves line and point primitives to separate meshes.
   Set the AI_CONFIG_PP_SBP_REMOVE option to aiPrimitiveType_POINTS | aiPrimitiveType_LINES to cause SortByPType to reject point and line meshes from the scene.

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Fixed in #38

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