There are several questions.
Is it possible to customize the operation of the Background Plate for Karma XPU in animation?
If not, can it be done in another way in animation?
How to use the Karma Background Plate material found in the materials gallery?
I'm a beginner, and I can't think of it myself, and even a short explanation probably won't help.
Can anyone explain all this in detail and throw off another simple scene where everything is connected and Karma Background Plate material is used?
I attach a test file, configured for Karma CPU, without Karma Background Plate material.

Try throwing away or disabling the background plate node, and use the two fields on the camera for background and foreground plates..?

Энивоб
Try throwing away or disabling the background plate node, and use the two fields on the camera for background and foreground plates..?

don't know how to do it

Hi. XPU currently doesn't support background holdouts nor the built-in background plate material (which is VEX based).
You can see the list of currently supported for XPU here: https://www.sidefx.com/docs/houdini/solaris/karma_xpu.html [www.sidefx.com]

Does Houdini 20.0 Background Plate work on XPU? I still can't make it work. How to make Background Plate work in XPU?
Render outputs contains all the necessary layers. But the image is not displayed correctly in the viewing window.

Its odd I had it working in Karma XPU last night but today for no reason the background plate renders as a foreground plate over the image. Anyone else having this issue?

+1 for getter background plate supported on XPU.

Please check tomorrow's build for the fix. And thank you for reporting the bug!

ali_f
Please check tomorrow's build for the fix. And thank you for reporting the bug!

Thank you! Now everything works!!!
I checked it on version 20.0.547.

The XPU render engine will display an error message
Invalid material binding: /BG/mesh_0 -> /materials/background
I know XPU not support Principled Shader
Can developers modify the default background material in the background plate?
For example, the Principled Shader material can be changed to materialX to make it better support XPU？