Christoph Fasching

That does sound like an oversight on SideFX’s side. The training code itself clearly seems prepared to fall back to MPS on Apple Silicon, but Houdini appears to stop the process earlier with its CUDA check.

I remember using a few GitHub projects that were primarily built around CUDA, but after installing the correct PyTorch build for Apple Silicon and a couple of additional dependencies, they worked through MPS. I just have not had the time to dig through Houdini’s generated environment and try the same thing here.

I would also have expected SideFX to handle that setup automatically on macOS, especially if the underlying script already contains an MPS fallback. Hopefully it is just a missing dependency or an overly strict validation check rather than the actual training implementation being CUDA only.

EDIT: I sent an email detailing the issue to support@sidefx.com

I was trying the new ML Train GSplats node in Houdini 22 on macOS, but it immediately fails with:

ERROR: No CUDA GPUs detected. GSplat training requires a CUDA-capable GPU.

So once again, a new Houdini feature appears to be Nvidia only and therefore unavailable on macOS.

Did I overlook an alternative backend or setting for Apple Silicon, such as Metal or MPS, or is GSplat training currently CUDA only?

Maybe someone from SideFX or anyone who has tested this on a Mac can provide some insight.

I have a water simulation scene that I originally created in Houdini 21.

After opening the same project in Houdini 22 and rendering the same frame with the same settings, the result has a very noticeable red/magenta tint.

I have already checked for missing textures, broken file paths, and issues with the HDRI, but everything appears to be loading correctly.

Has anyone encountered a similar color shift when moving a project from H21 to H22?