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Christian Behrendt avatar image
Christian Behrendt asked ·

Thin Walled SSS Geometry is destroying mattes

Hi Guys,

I need masks for a project right now and I've come to the conclusion that Objects with Thin Walled SSS are receiving illumination from the mattes and/or are computing the subsurface effects, so the masks are unusable.

Once I turn thin walled off everything works as expected.

I've attached a screenshot showing how a matte looks with thin walled sss geometry in it.

Thanksthinwalledsss.jpg

c4dtoatexturemattes
thinwalledsss.jpg (249.2 KiB)
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Peter Horvath avatar image
Peter Horvath answered ·

Supposed to be fixed in C4DtoA 2.3.1 (Arnold core 5.1.1.0).

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Peter Horvath avatar image
Peter Horvath answered ·

OK, I've got it. It looks correct in the IPR, but not in the Picture Viewer. Which is odd. Seems like a bug, and reminds me of an issue with the object masks reported earlier. I'll take a look.

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Christian Behrendt avatar image
Christian Behrendt answered ·

I'm on 2.2.2.3 still, on C4D R18 and Win7 64bit.

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Peter Horvath avatar image
Peter Horvath answered ·

That's weird, this is what I've got in the IPR:

What's your C4DtoA version? Win or OSX?


multimatte.png (5.5 KiB)
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Christian Behrendt avatar image
Christian Behrendt answered ·
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Peter Horvath avatar image
Peter Horvath answered ·

Could you please post me a screenshot of the issue in the shared scene? Only the camera rays are written to a custom AOV, no indirect, so it should look fine and I don't see any problems in your Multimatte AOV. Looks the same with or without Thin Walled enabled. Maybe I just overlook something.

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Christian Behrendt avatar image
Christian Behrendt answered ·

Hi Peter,

I've attached a scenefile for you - I don't believe this is intentional behaviour. If it is, I think it would be nice to have something like a "Transmit AOV" checkbox for SSS. But as the standard SSS isn't showing this effect I think it might be a bug.

Thanks for looking into it!

Cheerssss-matte.zip


sss-matte.zip (179.2 KiB)
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Peter Horvath avatar image
Peter Horvath answered ·

Can you send me a scene or some screenshots of the shader parameters?

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