Forums Technical Discussion Karma XPU Color for Volume

Karma XPU Color for Volume

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chf
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I am trying to achieve something like this in Karma XPU.

volume displacement in arnold [leegriggs.com]


Is there a way to do colored volumes with materialx and karma xpu yet?
Edited by chf - March 2, 2023 12:27:56
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jsmack
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I think you're stuck with Mantra for volume displacement
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Rates
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If you are looking for how to render a color volume in Karma, there is a "color with Cd volume" check box on the pyro shader. It's a little confusing; if you are using "Pyro Bake volume" to set up your shader, and have the "Diffuse Volume" set to Cd in the bindings, the pyro shader it creates doesn't have "color with Cd volume" turned on by default.
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yayitsyasuo
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Hmm, for me in h20 checking that box still wouldn't color my volume.
A workaround was using "Karma Pyro Shader" instead of the "Pyro Shader" created by "Pyro Bake Volume". The checkbox there works.
Thanks for the tip still.
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Kareeem
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yayitsyasuo
Hmm, for me in h20 checking that box still wouldn't color my volume.
A workaround was using "Karma Pyro Shader" instead of the "Pyro Shader" created by "Pyro Bake Volume". The checkbox there works.
Thanks for the tip still.


But the Pyro_Shader that comes with the "Pyro Bake Volumes SOP" does not work with XPU since its VEX based...
www.rehimi.de
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Kareeem
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You can find a working XPU shader that reads Cd volumes here:

https://www.sidefx.com/forum/topic/93012/ [www.sidefx.com]
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Kareeem
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Sorry for spamming but actually this is much simpler now, then the shader I posted above. These materials read all in the Cd volume and to my surprise it doesn't even matter if they are 3 single float Houdini volumes or if they are VDBs!





Attachments:
karma_volume_custom.png (95.8 KB)
karma_pyro_smoke_material.png (142.0 KB)
karma_unform_volume.png (162.2 KB)

www.rehimi.de
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