black stroke around sun?
- ViennaLinux
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black stroke around sun?
Can I somehow remove the black stroke around the sun?
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Core2duo e6600 @ 3.1GHz watercooled at default VCore ^^
- ViennaLinux
- Posts: 191
- Joined: Thu Jul 26, 2007 9:26 am
- Location: Vienna/Austria
- Contact:
- ViennaLinux
- Posts: 191
- Joined: Thu Jul 26, 2007 9:26 am
- Location: Vienna/Austria
- Contact:
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- Posts: 126
- Joined: Wed Nov 28, 2007 9:16 am
Aperture diffraction will cover up or wash out the ring, but it might not eliminate it. Using a splat filter without a negative lobe is your best bet. This is NOT an Indigo bug; it's a limitation of certain types of filters. It's important to use the right tool for the job .
Incidentally, mental ray does NOT clamp out negative lobes of these filters. It's possible to get dark areas adjacent to bright highlights in mental ray as well. Again, you have to know the tools and how to use them.
Incidentally, mental ray does NOT clamp out negative lobes of these filters. It's possible to get dark areas adjacent to bright highlights in mental ray as well. Again, you have to know the tools and how to use them.
Ah well I remember mitchell-netralvi filter was causing bad sampling of final gather, causing black blotches, but that's old story (mr 3.3)
From the help files (as of 2004):
From the help files (as of 2004):
"The Mitchell and Lanczos filters are both approximations of the theoretically ideal sinc filtering function, cut off after its second lobe. In most cases, the Mitchell filter gives better results."
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- Posts: 126
- Joined: Wed Nov 28, 2007 9:16 am
Yep you are right, I was wrong to use that argument.
Ah, got it:
EDIT: I would add: DL3DBlackspotsRemover:
Ah, got it:
mr 3.1, Q1 2002.mr doc wrote:filter clip mitchell|lanczos [width [height]]3.1
These are variants of the regular Mitchell and Lanczos filters that clip the filter result to the range of samples under the filter. Mitchell and Lanczos filters have negative coefficients, which can cause ringing around sharp contrasts. Clipping prevents ringing.
EDIT: I would add: DL3DBlackspotsRemover:
DL3DBlackspotsRemover to remove black squares / spots problem when rendering (especially with final gathering)
You are in this case if when you increase the filter size your black spots' size increases too.
Last edited by CTZn on Sat Aug 16, 2008 5:53 am, edited 1 time in total.
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