Backface Culling issue

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Backface Culling issue // Tech Forum

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Post by transient // Oct 18, 2008, 10:09pm

transient
Total Posts: 977
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I'm having issues with backfacing edges being visible in the main 3d window, even though they're not supposed to be. In the screenie below, the two windows have the exact same settings, yet the 3d window has the backfacing edges showing through.


This is driving me nuts, as I'm having trouble discerning between the front and back edges when editing, and nothing I do seems to change this. Is this a bug or driver issue, or do I have the settings wrong?

Post by Tiles // Oct 18, 2008, 10:50pm

Tiles
Total Posts: 1037
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I feel with you. I hate this behaviour too.

This behaviour has to do with ClippingNear. And the Position and Zoom of your object. To minimize this effect make sure that you keep your object in the center of the scene if possible. Don't move away too far, better live with the fisheye zoom. And don't make your object too big.

Additional solution is to change the ClippingNear of your camera. But this is just a temporary solution. Because every change of the view resets the ClippingNear to the default values. Which are hardcoded, and not changeable.

Open up Scene View. At nearly the end of the list open the D3D tree and click at the Eye Camera. Its settings will come up in the stack. Here change the ClippingNear to 5 for example. Note that with a value of 10 and higher the Workspace navigation widget disappears.

Post by transient // Oct 18, 2008, 11:39pm

transient
Total Posts: 977
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Thanks tiles.:)

Post by Tiles // Oct 18, 2008, 11:45pm

Tiles
Total Posts: 1037
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You're welcome :)

Post by trueBlue // Oct 19, 2008, 7:22am

trueBlue
Total Posts: 1761
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Does unchecking Show Hidden Lines in Settings/Scene help?
Also with my Camera Viewer toolbar shown in your screenie you can Right click the Eye Camera View to show the current EyeCamera in the Stack.

Post by transient // Oct 19, 2008, 4:01pm

transient
Total Posts: 977
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Does unchecking Show Hidden Lines in Settings/Scene help?


No, it's definitely a clipping issue. Setting the near clipping range to 1.0 solved the problem without any adverse effects that I could see.


Also with my Camera Viewer toolbar shown in your screenie you can Right click the Eye Camera View to show the current EyeCamera in the Stack.


Thanks for the tip, that makes things much simpler. :) Basically to solve this problem now all I have to do is right-click on the Eye Camera View icon in your toolbar and change the ClippingNear setting to 1.0. It will keep this setting until I restart ts. Thanks for the help, Tiles and Trueblue.:)


While this is now offically a non-issue for me, I think Caligari may need to have a look at this.

Post by Tiles // Oct 19, 2008, 11:10pm

Tiles
Total Posts: 1037
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It will keep this setting until I restart ts.


Unfortunately not. Just as long as you stay in the current view. Switch to orthogonal views like Front view and the ClippingNear will be set to 0.0. Switch back to Perspectivic and you are back at 0.1.

Post by transient // Oct 19, 2008, 11:40pm

transient
Total Posts: 977
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You're right, that's what the panel says. However, the clipping problem still seems to be gone, even when I change views or open a new one. Strange. :confused:


Also if you set the clipping number too high (like 5 on my scene) the lasso selection "selector" disappears.

Post by Tiles // Oct 19, 2008, 11:47pm

Tiles
Total Posts: 1037
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That tools and widgets disappears with a higher ClippingNear value has to do with that they are not in a separate layer. They are in the same layer than the scene. And so you can let them disappear with changing the clipping settings. Lasso Tool disappears at ClippingNear 5, Workspace Navigation Wdiget at ClippingNear 10.

Post by transient // Oct 19, 2008, 11:50pm

transient
Total Posts: 977
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Yes, that's the same with me. Nice to know.:)
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