I feel like I am missing something, I would like to use Karma XPU for an upcoming project. I have a simple material setup with a mix between a diffuse and a metallic MTLX shader. I am getting the below error:

KarmaXPU: Material _sg_s_5510EB952FE4D00E has type not handled by XPU, skipped

I realize it is saying the "mix shader" is not supported by XPU.

Is there a workaround? It works fine with CPU.

This seems like such a basic need that it is making me think I am doing something wrong. There are so many seemingly abstract nodes for XPU why would devs omit the MTLXMIX?

Sorry, mixing of arbitrary materials is not yet supported by XPU
XPU limitations are listed here
https://www.sidefx.com/docs/houdini/solaris/karma_xpu.html#summary [www.sidefx.com]
(this falls under the category of "PBR" nodes)

We are working on addressing this though, so watch this space

brians
Sorry, mixing of arbitrary materials is not yet supported by XPU
XPU limitations are listed here
https://www.sidefx.com/docs/houdini/solaris/karma_xpu.html#summary [www.sidefx.com]
(this falls under the category of "PBR" nodes)

We are working on addressing this though, so watch this space

Hey there,
just tested this in Karma XPU in the new H20 release, but it still doesn't seem to be supported to mix surfaces, right? Or am I missing something here?
Thanks!

you can mix two MtlxStandardSurfaces via a MtlxMix node
https://www.sidefx.com/docs/houdini/solaris/karma_xpu.html#summary [www.sidefx.com]

brians
you can mix two MtlxStandardSurfaces via a MtlxMix node
https://www.sidefx.com/docs/houdini/solaris/karma_xpu.html#summary [www.sidefx.com]

Hey brians,
thanks for the reply. That is what I am already using, it works fine in Karma CPU but the same shader renders just grey in XPU currently. I do not get the same error as in H 19.5 saying it doesn't support MtlxMix nodes anymore but it still doesn't render correctly.
Thanks!

I'm not sure what issue you have.
But here is an example.
Does it work for you?

brians
I'm not sure what issue you have.
But here is an example.
Does it work for you?

Hey,
Yes that example file works on my side as well. I noticed however when I add another MtlxMix node after that one and add another surface mix it fails to render on XPU which is what I did in my project as well to layer different shaders, still works fine on CPU though (attached example). Is that a Karma XPU limitation at the moment then?
Thanks!

eyellusion
Is that a Karma XPU limitation at the moment then?

Yes, it currently allows only the mixing of two MtlxStandardSurface nodes.

brians

eyellusion
Is that a Karma XPU limitation at the moment then?

Yes, it currently allows only the mixing of two MtlxStandardSurface nodes.

I see, good to know. Can probably find a workaround then. Thanks!

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