Forums Technical Discussion Karma XPU vs CPU Issue

Karma XPU vs CPU Issue

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cwrenniks
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Anyone know why I'm seeing this blueish tint when using Karma XPU vs Karma CPU? All materialX shaders.
Edited by cwrenniks - 2024年10月10日 16:38:08

Attachments:
KarmaCPU.png (1.0 MB)
KarmaXPU.png (1.1 MB)

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tachbek
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It seems like the shadow color has changed to blue for the main light. It’s challenging to pinpoint the issue based solely on a screenshot, but consider adding an AOV – it might help identify the problematic area. Additionally, given Houdini’s transitional phase, using a newer version might resolve the problem.
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brians
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Can you post a repro scene?
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cwrenniks
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I'll post tomorrow when back at my desk, but this was just the files found in https://www.sidefx.com/tutorials/usd-asset-building-with-solaris/ [www.sidefx.com]
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cwrenniks
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Using 20.5.370 on windows 11
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cwrenniks
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actually, probably easiest to just download the hip, but attached the zip for ease of use. If you check out the "Instance Decorations and Render" box, that is the full scene.

Attachments:
USD_AssetBuilding_with_Solaris.zip (534.5 KB)

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cwrenniks
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Verified that this still happens on 20.5.384
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pandalay
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Adding light filter gel for light fixes tint somehow, and it's not just shadow.

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Attachments:
xpu_shadow_0_light_filter_gel.jpg (124.7 KB)

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pandalay
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There is some issue with latest nvidia drivers and XPU, rolling back to older studio driver version fixed problem.
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chrism
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Thanks! For future reference....
https://www.sidefx.com/forum/topic/70943/ [www.sidefx.com]
Chris McSpurren
Senior Quality Assurance Specialist
SideFX
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cwrenniks
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Just to close this down, I'm not seeing this problem in the latest production build ( 20.5.410 ). Thanks!
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brians
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cwrenniks
I'm not seeing this problem in the latest production build ( 20.5.410)

More details here
https://www.sidefx.com/forum/topic/98442/ [www.sidefx.com]
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Xue_Yue
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I had the exact same issue, and lowering the "specular multiplier" on the light to ~0.95 solved the blue tint.

But good to know that it is resolved now.
Edited by Xue_Yue - 2024年11月15日 09:57:55
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