I am having an issue while trying to render a heavy spaceship in USD format using Karma XPU. My setup is unable to render the asset properly, and I am unsure of the cause.

When I first switch to Karma XPU, it takes 20–30 seconds for the spaceship to load in and begin rendering. However, when I move the viewport, the spaceship freezes in the same position and does not recalculate. Additionally, both of my GPUs become stuck during initialization and do not proceed to render.

while it's trying to load, i have no issue moving around the viewport and the UI, but the moment i try to click anything, Houidni will turn strange not responding;(

My system specifications:

AMD Ryzen 9 3900X, 12-core processor
64GB RAM
2 x RTX 2070 Super GPUs
Houdini 20.0.547


things i've tried:

- Updated the drivers
- Loaded the file on another computer, where it worked smoothly without issues

I would greatly appreciate any assistance or advice.
Thank you!

I believe this is shader compilation. Try leaving it for a very long time, eg 15-30mins (and with very high sample count, to make sure EmbreeCPU doesn’t finish the frame in the meantime).

If it starts eventually running, then yes it is a shader compilation, and we’ve either already adressed, or plan to address it, in the next major release of houdini

brians
I believe this is shader compilation. Try leaving it for a very long time, eg 15-30mins (and with very high sample count, to make sure EmbreeCPU doesn’t finish the frame in the meantime).

If it starts eventually running, then yes it is a shader compilation, and we’ve either already adressed, or plan to address it, in the next major release of houdini

thanks Brians for your answer! however waiting doesnt seems to solve the issue, it's been 7 hours and nothing is loading, the spaceship still froze and both optix still initializating, moving the viewport and navigating the UI still works but the asset won't move and just froze in the same angle from the beginning.

im not sure is this a bug or something to do with my pc, do you have any suggestion other then it could be a shader compilation? Or things that i could try turning on or off?

thank you!

Ok that is strange, seems like a bug then.
Is it possible you could submit a bug report, with repro scene and clear repro steps?
Thanks