Karma XPU, Matt Shadow catcher

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Hello

I have a simple scene a sphere and a grid plane, just want to test how I can render out a ground plane as a shadow catcher (matt object, with shadows on it).
I can't find the way to do it in solaris and karma Xpu.
please let me know how I can do it.

thank you in advance
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It should work as the doc says but unfortunally the shadow layer is empty with karma XPU!
It works with karma by the way. but I need XPU version for faster render.

PS: That's the principed shader inside Backgourd plate subnet that makes it uncompatible with XPU version.
Edited by MirHadi - 2021年11月30日 05:29:56
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MirHadi
It should work as the doc says but unfortunally the shadow layer is empty with karma XPU!
It works with karma by the way. but I need XPU version for faster render.

PS: That's the principed shader inside Backgourd plate subnet that makes it uncompatible with XPU version.

XPU doesn't support the necessary AOVs yet, so it's not possible.
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Annyone know how to apply maps to the channels ?
Edited by TangheStudent - 2022年3月6日 11:42:13
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Hi Guys, I'm now moving to XPU from many years of using Arnold, XPU is such a great renderer, the only issue I have with my renders is the Shadow Matte, I have been using a plane with a texture on it's Opacity channel to blend the plane into the Dome Light's map so I can catch the shadows, this works o.k. for still shots, but takes quite a bit to set it up.
Is there any eta on when a shadow catcher will be added to XPU?
Again, great work on this beautiful renderer.
T.
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Tser
Is there any eta on when a shadow catcher will be added to XPU?

The next version of Houdini will have much better support for shadow mattes in XPU
namely
- shadow LPEs (eg "shadow;C.*")
- Holdout LPEe (eg "holdout;C.*"or "holdout;C<..'torus'>.*"etc...)
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Tser
The next version of Houdini will have much better support for shadow mattes in XPU

did you refer to H20 or a previous 19.5 build? I still can't get shadow mattes to work in 19.5.605
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eaniix
did you refer to H20 or a previous 19.5 build? I still can't get shadow mattes to work in 19.5.605

Not H19.5
Sorry I should have said "the next major version of Houdini"
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Hi, any update on this topic by any chance? Running into same issue, need shadow matte on ground obj, but having hard time getting it. Any updates?
This is such a basic thing shouldn't be that hard
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I am struggling to setup the shadow catcher with XPU, background plate doesn't work with it, any directions would be appreciated it.
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Yes I am also struggling with a proper shadow catcher setup.
Maybe someone could post a .hip?

I would wish a shadow catcher shader, something easy to apply. Isn't this an essential function?
Edited by tomtm - 2023年11月27日 08:24:11
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Still no luck on my side....
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Has anyone been able to get a shadow catcher functionality in Houdini 20, or is it the same as 19.5?
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20.0.548 Fixed a bug in Karma XPU to get Background Plate node working

Maybe give it another try?
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20.0.548 Fixed a bug in Karma XPU to get Background Plate node working

Maybe give it another try?

Could you setup a shadow catcher now? I can't.
Is there probably a .hip to show?

I can't get it.
Edited by tomtm - 2023年12月10日 17:33:39
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How about this?
It's a basic scene I've used for testing.

Here are the docs for the background plate too
https://www.sidefx.com/docs/houdini19.0/nodes/lop/backgroundplate.html [www.sidefx.com]

Attachments:
test.hip (909.0 KB)

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How about this?
It's a basic scene I've used for testing.

Here are the docs for the background plate too
https://www.sidefx.com/docs/houdini19.0/nodes/lop/backgroundplate.html [www.sidefx.com]

Thank you for the sample.
Is it also possible to have no plate image just transparency directly saved out like in the pitures below.
In this scene I had a shadowCatcher Material on the floor.

Attachments:
ShadowCatcher_Alpha.jpg (376.6 KB)
Shadow_Cacher_Viewport.jpg (177.1 KB)

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When I set the render engine to XPU the render takes quite a bit longer than CPU, and I don't think you can get the same effect as a shadow matte (Shadow Catcher) with an environment light hdri, unless this ability is hidden somewhere.
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When I set the render engine to XPU the render takes quite a bit longer than CPU, and I don't think you can get the same effect as a shadow matte (Shadow Catcher) with an environment light hdri, unless this ability is hidden somewhere.

I think it would be essential for later compositing where you load the background footage.
It would be cool to have a ShadowCatcher Material.
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