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Originally Posted by Andy Colebourne
Make a rectangle in the plan view. Select one vertex and pull it upwards in the front view. Now all points are not on the same plane. Although AC3D copes quite well with this shape, this non-planar rectangle should really be triangulated since all the points are not 'flat' on the same plane.
Andy
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Ok, I get that but why doesn't it turn red ad become a hole ?