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Blender 2.49 Scripting by Michel J. Anders

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Selecting warped (non-planar) quads

Warped quads, also known as bow-tie quads, are sometimes formed when accidentally mixing up the vertex order during face creation. In a less extreme case they might be formed when moving a single vertex of a planar quad. This small illustration shows how these may look in the 3D-view:

Selecting warped (non-planar) quads

In the 3D view, the warped face on the right didn't seem out of the ordinary but when rendered it does not show uniform shading:

Selecting warped (non-planar) quads

Both objects are planes and consist of a single face with four vertices. The one on the left is a bow-tie ...

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