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Using a primvar string to give a texture path July 16, 2024, 7:26 p.m.

That is some good investigating

I just checked and it it seems non uniform string primvars are not supported in 20.5 Karma XPU yet unfortunately.

Unfortunately, we have not had a chance to get this feature into H20.5 as we hoped. But it is a high priority for us, so we're at least aiming for the next release.

About this last method, you previously wrote:
Yes, XPU currently pre-loads all the texture data.
So in this case it will pre-load ALL UDIMs, whether they're needed or not
Does it mean this method won't be very efficient, correct?

H19.5 had to pre-load everything (so was not efficient at all with UDIMS).
Since H20 we have had on-demand loading, meaning UDIMS are efficient now

Houdini 20.5 is out for grab! July 10, 2024, 11:44 p.m.

In my test,the variance mode is slower than uniform mode.Why?

How many pixel samples were you rendering with?
variance oracle only really benefits final-frame rendering when large sample counts are used, otherwise the overheads associated with it will probably outweigh the benefits.

And we can't download the daily builds?

Not yet, they'll be ready in approx 1-2 weeks

Houdini 20.5 is out for grab! July 10, 2024, 6:48 p.m.

I did a few more render tests with XPU ray-trace

What driver are you on?
If you're on a 555+ driver, then you'll get the NVidia "Shader Execution Reordering" feature (new hardware in the ADA generation of GPUs)