Tips for sub-surface scattering (SSS) for realistic ceramics

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Tips for sub-surface scattering (SSS) for realistic ceramics

Postby scooternva » Fri Mar 26, 2021 5:30 am

scooternva Fri Mar 26, 2021 5:30 am
I have been futzing around with sub-surface scattering (SSS) all afternoon to try and make a semi-decent coffee cup and cannot for the life of me get anything approaching the translucency or scattering required. There's nothing here help-wise in the LightWave forum that I've been able to find, and the only search hits I've gotten in other forums are years old and/or for Cinema 4D.

I've tried adapting what I've seen in the C4D help documentation to LightWave, but the best I've been able to achieve is a very, very black (but shiny!) cup that sort of looks like it's doing SSS, but no amount of tweaking is getting me anywhere close to my goal: a simple white china- or porcelain-like surface.

Before I declare defeat and just use a combo diffuse and glossy material, I thought I'd shout out into the darkness and hope someone can give me just a very basic hint or two. If I just had a passable starting point, I think I could feel my way from there. Thanks!
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Re: Tips for sub-surface scattering (SSS) for realistic ceramics

Postby scooternva » Fri Apr 09, 2021 4:23 pm

scooternva Fri Apr 09, 2021 4:23 pm
No one models ceramics? Is this thing on?
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Re: Tips for sub-surface scattering (SSS) for realistic ceramics

Postby Lewis » Mon Apr 12, 2021 2:19 pm

Lewis Mon Apr 12, 2021 2:19 pm
Can you show use examples/problems you might think you have/expect, I never used SSS for ceramic materials so far and none of my Architect clients argued and said it's not looking like ceramics :).
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Re: Tips for sub-surface scattering (SSS) for realistic ceramics

Postby slv » Mon Apr 12, 2021 6:11 pm

slv Mon Apr 12, 2021 6:11 pm
Hi _ yes _ i think there is a confusion, because ceramic is a fired clay object.
For more realistic render, you can add some micro rifts, cracks on a layer surface coat film reflection.

https://5500k.fr/
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Re: Tips for sub-surface scattering (SSS) for realistic ceramics

Postby tomas.base » Fri Aug 06, 2021 8:19 am

tomas.base Fri Aug 06, 2021 8:19 am
Try my porcelain and possibly modify it.
Attachments
nodes.png
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porcelain.orbx
ORBX material (OCT 2020.2.4)
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porcelain_srf.zip
LW surface (2015.3)
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porcelain_dev.jpg
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Re: Tips for sub-surface scattering (SSS) for realistic ceramics

Postby elsksa » Sat Aug 07, 2021 2:06 pm

elsksa Sat Aug 07, 2021 2:06 pm
tomas.base wrote:Try my porcelain and possibly modify it.

Hi Tomas, I am curious to know why a γ2.2 gamma-exponent has been applied to all your shading network. Octane should allow you in its preference, to change the color picker from Linear-sRGB to non-linear sRGB (with an EOTF applied, likely the approximation of the piece-wise function) thus making this operation not required.
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Re: Tips for sub-surface scattering (SSS) for realistic ceramics

Postby tomas.base » Tue Aug 10, 2021 12:57 pm

tomas.base Tue Aug 10, 2021 12:57 pm
elsksa wrote:
tomas.base wrote:Try my porcelain and possibly modify it.

Hi Tomas, I am curious to know why a γ2.2 gamma-exponent has been applied to all your shading network. Octane should allow you in its preference, to change the color picker from Linear-sRGB to non-linear sRGB (with an EOTF applied, likely the approximation of the piece-wise function) thus making this operation not required.


I don't know how to set it up in Lightwave as far as it goes. The recommendation for the LW plugin is to set all items in colorspace to linear. Then I have to correct the gamma everywhere. It is not in the plugin settings.

If I set the LW setup so that the picked colors match the IPR (Palette files = sRGB, DisplayColorSpace = sRGB, others LINEAR) then I don't have to correct anything, but it doesn't match ShaderBall. It is faster for more complex scenes. And that's the problem, because in a difficult scene, I have to wait a few minutes before I see the result.

Sometimes I use Standalone to create the material, for example a gradient node is badly used without a graphic slider.

I also prefer the LW palette in linear, the default one, because LW2015 under Windows 10 is non-functional in some things about color presets in the palette. It took me a while to figure out how to sync the Modeler. LW is already dead.

I'm moving to Cinema 4D, but I will miss the LW experience from version 5 for a long time.

If someone can set Lightwave so that the RGB spectrum without GAMMA correction in IPR corresponds to ShaderBall, then I'm probably blind, because I tried all the options to set up ColorSpace in LW. Or can someone advise me how.
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