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just some vray questions about shadow artifacts
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just some vray questions about shadow artifacts // Tech Forum
Post by Leif // Dec 1, 2008, 3:35pm
Leif
Total Posts: 276
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Hi
the big ball has a spotlight almost right above it pointing down.
How to get rid of the blocky shadow artifacts?
gi and one spotlight with shadow enabled:
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gi and one spotlight, no shadows
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workspace d3d render to show object resolution:
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Post by brotherx // Dec 2, 2008, 12:45am
brotherx
Total Posts: 538
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have you tried it with soft shadows? |
Post by Leif // Dec 2, 2008, 7:17am
Leif
Total Posts: 276
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Yes :cool:
The artifacts reminds me of shadowmap resolution issues, but how can that be!
The scene is to learn vray lights, gi settings and material settings. |
Post by brotherx // Dec 2, 2008, 8:02am
brotherx
Total Posts: 538
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have you tried changing the anti-aliasing settings?
if you post the scene, I'll give it a shot on my PC at home in case it is a machine funny... |
Post by Leif // Dec 2, 2008, 10:11am
Leif
Total Posts: 276
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Hi brotherx
Adaptive aa is used here, though antialiasing is not the issue here :)
The blocks go away if the big ball is subd twice. Is there another way than to increase mesh resolution?
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Post by brotherx // Dec 2, 2008, 10:29am
brotherx
Total Posts: 538
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get the same problems. played with some settings but no luck. even tried v.high GI settings. it's a bug I would say... |
Post by Leif // Dec 2, 2008, 10:34am
Leif
Total Posts: 276
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Well thanks anyway!
I did not intend to have the spot pointing straight down, but once I saw those shadow block things appear I started hunting for answers as to what is happening and how to straighten it out! |
Post by frank // Dec 2, 2008, 4:12pm
frank
Total Posts: 709
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In the first render, the artifacts on the sphere remind me of what you might see on a lower polycount object without Autofacet enabled for the shader.
One remedy might be to enable Autofaceting, use SDS, or do a Smooth Quad Divide or two. |
Post by Leif // Dec 2, 2008, 6:59pm
Leif
Total Posts: 276
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Hi frank.
Yes it does.
Well one sds layer, still some faceting (I'm picky here :) ).
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Two sds layers, smoothed it out.
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A rougher sphere with smooth normals looks like this,
Shading is smooth where lit by spotlight but faceted down under
(not the facets themselves, but the distinct *difference* in normal smoothing which can be seen between the upper half and lower half of the ball).
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