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Gravicx Gravicx avatar image
Gravicx Gravicx asked ·

Random Walk SSS Bug Fix?

Will there ever be a fix for the Random Walk SSS? I've been waiting for months and it's still the same depth limit "bug" since then.

There are some others who have already reported the bug here.

Thanks.

https://answers.arnoldrenderer.com/questions/7832/view.html

shadersshadershading
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Stephen Blair avatar image
Stephen Blair answered ·

The minimum radius is clamped to avoid the problems that happen with loss of precision with really small values. Similar problems happen if you're really really far from the origin. This is a limitation of floating point precision, so unless we can come up with some alternative approach or tradeoff, the clamping stays.

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Kalpesh Juthani avatar image
Kalpesh Juthani answered ·

How can I fix it this bug ?

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M R avatar image
M R answered ·

Hello,

is there a chance of actually documenting this limitation? Obviously, quite a few people run into this, e.g when rendering thin features like flowers, leaves (which might have thickness for a closeup).

The only way to find out it exists right now is to google exactly the right terms and arrive here and a few other places.

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We were able to further improve this limit in Arnold 5.3 (released a couple months after the initial problem in this post was reported). Are you still seeing issues in 5.3 or newer?

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Daniel Hennies avatar image
Daniel Hennies answered ·

The default export scale in C4D is set to 1 meter, yet it needs to be set to 0.01 meter to honor the internal default dimensions withing c4d. The sss density scaling works fine enough then, so its no bug.

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Gravicx Gravicx avatar image
Gravicx Gravicx answered ·

Hey Stephen.

It's a shame to hear that. I can remember it worked in early releases. Maybe it was wrong in some way, but there was a result. The only way to get something useful is to scale up the whole scene. (Not really a solution for complex setups...).

Its one of the features that makes Arnold so unique compare to others engines. I hope there will be some improvements.

Thanks for your feedback.

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