Ensure all edges twins are upside-down #14008
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If forward_up_dist == backward_up_dist the previous implementation would return false for both half-edges. SkeletalTrapezoidation::generateSegments (and potentially other users) rely on edge->isUpward() != edge->twin->isUpward(). I'm unaware of any examples where this behaviour caused problems. I only noticed this bug while reading the code.
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If forward_up_dist == backward_up_dist the previous implementation would return false for both half-edges.
SkeletalTrapezoidation::generateSegments (and potentially other users) rely on edge->isUpward() != edge->twin->isUpward().
I'm unaware of any examples where this behaviour caused problems. I only noticed this bug while reading the code.