SU2022 + V-Ray (5.20.04) Texture Issue with GPU/RTX

[andy_smith]

Hi all.

I've just swapped out my GPU and rebuilt my workstation. As part of that I upgraded to SU2022 (Pro) and reinstalled V-Ray to the latest version. I'm trying to re-render a scene that I rendered several times the other day but am having a strange problem. Please note, this scene has rendered fine many times over the past week.

I previously used CPU rendering as my last GPU was a 1080Ti so was getting a little old for decent GPU rendering times. Now I have a 3080Ti so switched on GPU rendering. No other changes. Here is the scene as it was rendered via CPU a week or so ago:
https://www.dropbox.com/s/ybcf2zmnvi...erold.png?dl=0

Then here's what I get if I flick it to GPU and hit render now:
https://www.dropbox.com/s/xp9awo9har...ender.png?dl=0

The marble is very blurry/pixellated. If I switch back to CPU then it looks fine. Here's a comparison of the three render engines:
https://www.dropbox.com/s/w1lk8ssul5...rcomp.png?dl=0

And here's an example of the quality of the map in the material (which is correctly linked):
https://www.dropbox.com/s/pa7gxagqag...arble.png?dl=0
It's an 8k image.

So CPU works fine but is slow. I'm obviously doing something wrong here - can anyone help?
Thanks!

[andy_smith]

SOLVED

OK - I stumbled across a setting that seems to have resolved this. In V-Ray, under the V-Ray GPU rollout, the default setting seems to be to significantly down-sample textures to just 0.5k. I'm sure this speeds up rendering but obviously degrades quality a lot. I'd have thought that the default setting should probably be to use full-size textures and let people decide for themselves whether they want to downsample them, but there you go.

[Muhammed_Hamed]

Hi andy_smith,

the default setting seems to be to significantly down-sample textures to just 0.5k

The default behavior is using Full-size textures actually, I just checked.

FYI Resize is more about optimizing GPU memory than rendering speed. It can reduce GPU usage drastically to allow you to build a bigger scene.

Best,
Muhammed