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Old 12th January 2021, 07:20 AM   #4
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Join Date: Jun 2003
Posts: 4,450
Default Re: Straighten the vertices

I'm not sure what you mean by "inverting" but if you are getting black parts of the surfaces, it could be that the normals are being calculated wrong. This is usually caused by a concave polygon starting with the wrong orientation. You may have vertices overlapping (in the same place) within a polygon. Try running Object->Optimize vertices.

Try triangulating the problem surfaces. Or you could use Surface->change-vertex-order to try and remove the black parts.

Also, check all the normals are facing outwards (press 'n'). A quick way to test this is to set the surfaces to 1-sided and if anything is not visible from the outside, those surfaces need flipping.
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