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Aliasing problem…?
I’m pretty new to C4D, and I’m having a problem that I’m not quite sure how to fix. I have an animation that involves a camera swooping down close to the surface of a logo then pulling back to reveal the whole thing. The logo is a simple Extrude NURBS object with a shader applied to it, and there are two lights in the scene: an omni just behind/under the logo and a spot shining down on the face of the logo from a distance.
My problem can be seen here – there appears to be some sort of aliasing problem with the lighting. I’d like to get rid of even the rectangular banding effect I’m getting around the inside of the curve, but obviously more unsightly is that patch of triangulars around the top inside. I can fix the look by moving and weakening the omni light, but that takes away most of the depth of the logo, and it seems like a problem that shouldn’t be happening in the first place. The lighting isn’t representing the polys that are actually there – those are all very small quadrangles in my viewport.
Sorry for the long post; any ideas?
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4 Replies
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Theres a couple of things that can be done. First, go to the spline level of your nurbs object and set your adaptive spline to zero degrees. This may smooth things a bit. Next, go to the phong tag (the 2 balls icon next to the extrude object) and play with the phone angle settings. Often a bit of a higher number will even things out. good luck
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Thanks for the help. I found that changing the interpolation to linear smoothed things out, even though that seemed a little counterintuitive to me. I’ll keep the other tips in mind too.
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If you have 9.6 use the new “subdivided” spline interpolation.
As for the banding, I think that’s just down to a limitation of 8 bit color. It does give a wide color gamut but in cases like this where you have a very big, single-color gradient, you can still have problems.
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Yossarian, thanks for posting this one, I’ve had the same triangle problem myself. As for the banding, when making gradients for After Effects we use a small amount of noise to kill banding. You might want to try that in the material. You could do it in the color channel and it shouldn’t effect any other material parameters.
Amish Ed
“Shoot ’em all and let the Editor sort ’em out!”Dual 2Ghz G5, 4GB, running 10.3.6 w/QT 6.5.2, Black Majic DeckLink, AE Pro 6.5 w/BCC and Invig. 3D, PS CS2, AI CS2, FCP HD
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