Question: SSS Skin & Alphashadows & hair

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Question: SSS Skin & Alphashadows & hair

Postby JeffGalloway » Sun May 05, 2013 7:55 pm

JeffGalloway Sun May 05, 2013 7:55 pm
I have seen on this board that you need Alphashadows disabled to get a good SSS effect for skin. (I've tested it for myself and it is true, alphashadows enable kills the SSS effect)

But disabling Alphashadows created a big problem for transmapped hair, eyeleshed, etc.

How do you get around this issue?
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Re: Question: SSS Skin & Alphashadows & hair

Postby ch0pper » Sun May 05, 2013 8:24 pm

ch0pper Sun May 05, 2013 8:24 pm
Alphashadows disabled ]

I have never disabled these whilst rendering, but I will have a play and see what I can comeup with, never really had a problem as all my renders seem to have this enabled. Maybe you could post some of your findings be interested to see what your pictures look like
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Re: Question: SSS Skin & Alphashadows & hair

Postby face_off » Sun May 05, 2013 9:06 pm

face_off Sun May 05, 2013 9:06 pm
There was an SSS fix put through in Octane 1.13 too - so this might be different on that version. If not - then it is a general Octane issue and should be reported to Otoy.

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Re: Question: SSS Skin & Alphashadows & hair

Postby JeffGalloway » Sun May 05, 2013 9:27 pm

JeffGalloway Sun May 05, 2013 9:27 pm
Example Issue. This is done (with the poser plugin) in v1.13
Attachments
alphashadowissue.jpg
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Re: Question: SSS Skin & Alphashadows & hair

Postby KleanZlate » Sun May 05, 2013 10:12 pm

KleanZlate Sun May 05, 2013 10:12 pm
JeffGalloway wrote:Example Issue. This is done (with the poser plugin) in v1.13


Have you tried setting Absorption and Scattering to 0 and Phase=Scattering Direction to 1?
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Re: Question: SSS Skin & Alphashadows & hair

Postby JeffGalloway » Mon May 06, 2013 3:40 am

JeffGalloway Mon May 06, 2013 3:40 am
KleanZlate wrote:Have you tried setting Absorption and Scattering to 0 and Phase=Scattering Direction to 1?


Yes, I have tried that - and it does not give the same effect that I am getting with alphashadows disabled. There is something about the alphashadows enabled that deadens the SSS effect especially in the large volumes of the body.
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Re: Question: SSS Skin & Alphashadows & hair

Postby face_off » Tue May 07, 2013 5:16 am

face_off Tue May 07, 2013 5:16 am
Thanks for the comparison image - very useful. I have escalated this issue to Otoy.

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Re: Question: SSS Skin & Alphashadows & hair

Postby face_off » Fri May 10, 2013 9:42 pm

face_off Fri May 10, 2013 9:42 pm
Otoy have looked at this, and been able to reproduce the problem in Octane Standalone, so it will be fixed in a future release.

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Re: Question: SSS Skin & Alphashadows & hair

Postby JeffGalloway » Sat May 11, 2013 12:11 am

JeffGalloway Sat May 11, 2013 12:11 am
That's good news!
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Re: Question: SSS Skin & Alphashadows & hair

Postby JeffGalloway » Wed May 22, 2013 3:41 pm

JeffGalloway Wed May 22, 2013 3:41 pm
Can you tell from this:

viewtopic.php?f=33&t=32582

...if the fix for the above issue made it into this (1.15) release?
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