Karma XPU vs CPU Issue

Forums Technical Discussion Karma XPU vs CPU Issue

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cwrenniks: Member; 18 posts; Joined: Aug. 2017; Offline

Oct. 10, 2024 4:37 p.m.

Anyone know why I'm seeing this blueish tint when using Karma XPU vs Karma CPU? All materialX shaders.

Edited by cwrenniks - Oct. 10, 2024 16:38:08

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


tachbek: Member; 46 posts; Joined: Feb. 2017; Offline

Oct. 11, 2024 10:53 a.m.

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.


brians: Staff; 530 posts; Joined: May 2019; Offline

Oct. 11, 2024 2:41 p.m.

Can you post a repro scene?


cwrenniks: Member; 18 posts; Joined: Aug. 2017; Offline

Oct. 11, 2024 9:46 p.m.

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]


cwrenniks: Member; 18 posts; Joined: Aug. 2017; Offline

Oct. 12, 2024 8:44 a.m.

Using 20.5.370 on windows 11


cwrenniks: Member; 18 posts; Joined: Aug. 2017; Offline

Oct. 12, 2024 9:10 a.m.

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)


cwrenniks: Member; 18 posts; Joined: Aug. 2017; Offline

Oct. 12, 2024 9:28 p.m.

Verified that this still happens on 20.5.384


pandalay: Member; 2 posts; Joined: Dec. 2013; Offline

Oct. 17, 2024 9:06 p.m.

Adding light filter gel for light fixes tint somehow, and it's not just shadow.

Image Not Found

Attachments:
xpu_shadow_0_light_filter_gel.jpg (124.7 KB)


pandalay: Member; 2 posts; Joined: Dec. 2013; Offline

Oct. 18, 2024 11:17 a.m.

There is some issue with latest nvidia drivers and XPU, rolling back to older studio driver version fixed problem.


chrism: Staff; 2544 posts; Joined: Sept. 2007; Offline

Oct. 18, 2024 11:25 a.m.

Thanks! For future reference....
https://www.sidefx.com/forum/topic/70943/ [www.sidefx.com]

Chris McSpurren
Senior Quality Assurance Specialist
SideFX


cwrenniks: Member; 18 posts; Joined: Aug. 2017; Offline

Nov. 8, 2024 4:09 p.m.

Just to close this down, I'm not seeing this problem in the latest production build ( 20.5.410 ). Thanks!


brians: Staff; 530 posts; Joined: May 2019; Offline

Nov. 12, 2024 5:27 a.m.

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]


Xue_Yue: Member; 65 posts; Joined: June 2016; Offline

Nov. 15, 2024 9:54 a.m.

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 - Nov. 15, 2024 09:57:55

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