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Old 6th March 2010, 02:59 AM   #1
Hans_Petter
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Default Fixing normals

What is the best approach to fixing messed up normals? While I can flip normals that's of little help as a global command since it means that some will be fixed while the rest go bad. Is there a "synchronize normals"? Alternatively, how will I pinpoint each erratic surface and flip them one by one?
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Old 6th March 2010, 07:04 AM   #2
luuckyy
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Default Re: Fixing normals

Hi,
unfortunately, as you said, there's no "synchronize normals" option available in AC3D. The best thing to do is to take care of your normals while modeling.

I've found that reversed normals sometimes appear when :
1 - I extrude a face (the top of a cylinder for example) along a path
2 - I create an ordered surface

For case 1, after the extrude, I usually make all the extruded faces 1-sided and see if there's a problem

For case 2, the trick is to select your vertices counterclockwise while you (the camera) are facing the surface you are creating

HTH
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Old 6th March 2010, 04:33 PM   #3
Hans_Petter
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Default Re: Fixing normals

Good advice! Counter clockwise selection of vertices is important as well as being meticulous about getting each surface right. I found this script very useful:
http://www.inivis.com/forum/showthre...iding+surfaces

By hiding surfaces I can look inside a model without deleting anything. Convex surfaces tend to get the normals wrong. A black surface usually means that normals need to be flipped. By the way, I've spent hours trying to fix up a convex surface. Then I found a better way, I cut a slice of a sphere and used this for my curved surface element.
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