08-21-2024
12:34 PM
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08-21-2024
12:34 PM
About face normals:
Consider a rectangular box. Say the surface normals have the same direction as the face normals. They're all pointing outwards from the box.
Now you use that box to do a Boolean and cut a pocket in another shape. Any face normal that was pointing outward should now be changed to point inward (inward for the original box is now outward for the result solid). The way it's implemented, I'm pretty sure that the solid modeling software only has to set a boolean value on the face to say that the normal is flipped. It doesn't have to modify the surface.

Mike Deck
Software Developer
Autodesk, Inc.