Random walk SSS tutorial?

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Re: Random walk SSS tutorial?

Postby face_off » Sat Apr 18, 2020 1:26 am

face_off Sat Apr 18, 2020 1:26 am
PT -> GJ Clamp 50.000
Double check the recommended value in the link in my signature.

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Re: Random walk SSS tutorial?

Postby IainW » Sun Jul 05, 2020 4:30 pm

IainW Sun Jul 05, 2020 4:30 pm
Hey folks!

This looks pretty useful:
https://www.youtube.com/watch?v=FGtYyAlByhY

(Aimed at Houdini users - but the set-up principles are universal).

IAIN.
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Re: Random walk SSS tutorial?

Postby Sorel » Wed Jul 08, 2020 4:02 pm

Sorel Wed Jul 08, 2020 4:02 pm
IainW wrote:Hey folks!

This looks pretty useful:
https://www.youtube.com/watch?v=FGtYyAlByhY

(Aimed at Houdini users - but the set-up principles are universal).

IAIN.

Thank you for this, I'm having some great results with testing.
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Re: Random walk SSS tutorial?

Postby Kanne » Thu Jul 09, 2020 1:24 pm

Kanne Thu Jul 09, 2020 1:24 pm
IainW wrote:Hey folks!

This looks pretty useful:
https://www.youtube.com/watch?v=FGtYyAlByhY

(Aimed at Houdini users - but the set-up principles are universal).

IAIN.


Tried it aswell, results are okisch, but have downsides in my opinion. I allways have problems setting up the reflections on specular materials. For example following image uses a shader based on the video above. If i use an HDRI with nice enviroment lighting it looks quite good, but if i use a pretty harsch direct light (still path tracing kernal) the fresnel like shader effect becomes really visible in the shadow regions.

Elly_Issue_2_Denoised-beauty.png

(There is just a single light source to the left of her and no other objets that could reflect light on the right side of her face)

The issue seems to inheriate from the indirect reflections channel.
Elly_Issue_2_Reflection-indirect.png


Any tips on how to approach/fix this issue?

Related to this issue i get artefacts on a little more complex lighting setups as well. There are artefacts on the eye lids, on the bottom of her right nostril and the issue with the fresnel-like effect too,
Elly_Issue_Reflection.png


Other than that issue i think it looks quite well
Elly_Issue_Denoised-beauty.png
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Re: Random walk SSS tutorial?

Postby jmdarko » Sun Jul 19, 2020 4:47 am

jmdarko Sun Jul 19, 2020 4:47 am
Can someone show me how the nodes should be set up on DAZ? I have have been experimenting but feel completely lost; Can't get any kind of results even close to what i have been seen of RandomWalk
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Re: Random walk SSS tutorial?

Postby Banti » Sun Jul 19, 2020 9:26 am

Banti Sun Jul 19, 2020 9:26 am
jmdarko wrote:Can someone show me how the nodes should be set up on DAZ? I have have been experimenting but feel completely lost; Can't get any kind of results even close to what i have been seen of RandomWalk



https://www.youtube.com/watch?v=FGtYyAlByhY
This is a good starting point. Its not DAZ but the nodes are the same. I can upload my skin shader notes later on
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Re: Random walk SSS tutorial?

Postby jmdarko » Thu Jul 23, 2020 3:24 pm

jmdarko Thu Jul 23, 2020 3:24 pm
Banti wrote:
jmdarko wrote:Can someone show me how the nodes should be set up on DAZ? I have have been experimenting but feel completely lost; Can't get any kind of results even close to what i have been seen of RandomWalk



https://www.youtube.com/watch?v=FGtYyAlByhY
This is a good starting point. Its not DAZ but the nodes are the same. I can upload my skin shader notes later on


Thank you! This really helped me to get some results, another thing, Is there a way to fix this problem? I get it when using both Specular and diffuse layers, when following his guide, i guess it's the character geometry showing up? It also appears all around the model's bodies

Arms .png
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Re: Random walk SSS tutorial?

Postby Banti » Thu Jul 23, 2020 10:12 pm

Banti Thu Jul 23, 2020 10:12 pm
jmdarko wrote:
Banti wrote:
jmdarko wrote:Can someone show me how the nodes should be set up on DAZ? I have have been experimenting but feel completely lost; Can't get any kind of results even close to what i have been seen of RandomWalk



https://www.youtube.com/watch?v=FGtYyAlByhY
This is a good starting point. Its not DAZ but the nodes are the same. I can upload my skin shader notes later on


Thank you! This really helped me to get some results, another thing, Is there a way to fix this problem? I get it when using both Specular and diffuse layers, when following his guide, i guess it's the character geometry showing up? It also appears all around the model's bodies

Arms .png


You need to increase your figures subdivision level to at least 3. And make sure that "smoothing" is enabled in all your materials. This is a known problem with scattering and developers are aware of this. But since the last answer we got regarding this issue was "its just how the plugins works", i am not sure this will ever relly be fixed.
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