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3 Dimensional Chat / Editor Shading Problem in Blender

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BMacZero
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Joined: 30th Dec 2005
Location: E:/ NA / USA
Posted: 28th Nov 2008 16:58
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Hi,

I've been getting this strange shading on some of my faces when modelling in Blender:



I've always assumed this was a bad thing, some problem with the normals or something. Come to think of it, though, I've never read about this anywhere, though.

Does anyone know what this is? Is it a bad thing? And how do I get rid of it?

Thanks,

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Venge
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Joined: 13th Sep 2006
Location: Iowa
Posted: 28th Nov 2008 17:14
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It's because the angle is too sharp at the bottom. See how the vertex normals are pointing down on the corners? Try bevelling the edge to smooth the curve a bit.

I have CDO. It's like OCD, but the letters are in alphabetical order, like they should be.
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BMacZero
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Posted: 28th Nov 2008 18:31
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I don't get it . If it depends on angle, why doesn't it occur on cubes? I tried beveling it, and that seemed to get rid of it, but it raises the polycount unnecessarily, and I'm going for a fairly low-poly model I can use in a game.

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Venge
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Posted: 28th Nov 2008 19:28 Edited at: 28th Nov 2008 19:31
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Huh. Well, that's the solution I usually use, but I don't make many low-poly models. You mentioned a cube, so I tried a few things with that and it looks like the cube's vertex normals are projected at an angle from the adjacent faces, like so:



But if the side faces are deleted and the normals recalculated (Select all->Ctrl+N), the normals change to what you have:



I would try creating a face between the two edges you're having trouble with, recalculate the vertex normal and then delete the face. It's time-consuming, but if you really want to save on poly count I guess it's worth it.

I have CDO. It's like OCD, but the letters are in alphabetical order, like they should be.
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Alucard94
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Joined: 9th Jul 2007
Location: Stockholm, Sweden.
Posted: 28th Nov 2008 19:28
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Did you try selecting all faces and using CTRL-N? If that didn't work you might want to try and check your smoothing groups (I believe it's to select all faces and hit w or ctrl-w, not sure, and choose Set solid).


Alucard94, the member of the future of the past.
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BMacZero
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Posted: 29th Nov 2008 16:41
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Set solid worked (it wasn't w or ctrl-w though, had to find it on the toolbar). Thanks for the help, guys!

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