2nd November 2007, 09:13 PM | #1 |
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Inverted Normals
Does anyone know if there is a procedure (or a button click) that can fix inverted normals on solid objects or does each surface have to be flipped by dragging and selecting? Extruding multi-faced objects sometimes cause faces to be inverted. Too many to fix by hand on occasion.
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3rd November 2007, 04:12 PM | #2 |
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Re: Inverted Normals
I don't know of any way to batch-flip normals.
However, there's a button when you extrude that says "flip surfaces". This will keep your normals facing the right direction when you extrude and prevent the problem you describe. |
3rd November 2007, 05:51 PM | #3 |
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Re: Inverted Normals
Only way I know in Ac3d to flip normals pointing the wrong way is to select them all in surface mode, and use `flip normal` under the surface menu. And I think it says `flip new surfaces` Lisa And I must say I as well miss an option that selects inverted surfaces.
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3rd November 2007, 08:22 PM | #4 |
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Re: Inverted Normals
Thanks for your help. That should solve the immediate issue. Without assistance from professionals, the learning curve would be a whole lot longer.
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5th November 2007, 08:09 PM | #5 |
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Re: Inverted Normals
Yeah, I've thought about that one, too... I contemplated writing a plug-in, but I'm not sure if it's mathematically feasible on anything other than closed, convex shapes. On a closed convex shape, you could look for intersections between the polygon normal and other surfaces to determine which direction was "inside". But on a flat wall that wasn't closed, how would you know empirically which way it is *supposed* to point?
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5th November 2007, 08:36 PM | #6 |
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Re: Inverted Normals
That was my thought also. I was just hoping for something that might work on complex solids with the center being a reference for direction.
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