why mtlxsurface not support transmission depth

which version are you using? It should be supported since 20.0.246

20.0.246
Added support for transmission depth in karma CPU and XPU implementation of Mtlx Standard Surface.
Mon. February 6, 2023

For the MtlxStandardSurface, under the "transmission" tab...

• these 5 work: "transmission", "color", "depth", "dispersion" and "roughness"
  
• these 2 do nothing: "scatter", "anisotropy"
  

So depth does work (we call it "absorption"). But one gotcha is the automatic-fake-caustics (ie transparent shadows) can reduce the effect. One possibility is to disable it, or to tweak the "Fake Caustics Opacity" setting. The attached example shows depth/absorption working with fake caustics disabled.

tamte
which version are you using? It should be supported since 20.0.246

20.0.246
Added support for transmission depth in karma CPU and XPU implementation of Mtlx Standard Surface.
Mon. February 6, 2023

Thank you for reply ,yeah , the transmission depth works , but the transmission scatter color not support yet?

brians
For the MtlxStandardSurface, under the "transmission" tab...

• these 5 work: "transmission", "color", "depth", "dispersion" and "roughness"
  
• these 2 do nothing: "scatter", "anisotropy"
  

So depth does work (we call it "absorption"). But one gotcha is the automatic-fake-caustics (ie transparent shadows) can reduce the effect. One possibility is to disable it, or to tweak the "Fake Caustics Opacity" setting. The attached example shows depth/absorption working with fake caustics disabled.

thank you for detailed reply , it helps

happybabywzy
but the transmission scatter color not support yet?

No, because that would make it a volume.
The current workaround is to duplicate the geometry and make it a uniform volume.

brians

happybabywzy
but the transmission scatter color not support yet?

No, because that would make it a volume.
The current workaround is to duplicate the geometry and make it a uniform volume.

Hi Brian, are there plans to eventually support scatter?

Siavash Tehrani
Hi Brian, are there plans to eventually support scatter?

+1 Also curious when/if this will be supported.

freshbaked
Hi Brian, are there plans to eventually support scatter?

Yes eventually, but at the moment we have higher priorities

brians
Yes eventually, but at the moment we have higher priorities

Sounds good, thank you.