Vray GPU - Object renders fine in IPR, but turns grey in production rendering

[Alex_M]

I have an interior scene where the kitchen top renders fine with IPR, but turns grey when doing the production rendering. I found that if I use "Full-size" texture mode instead of "On-demand mip-mapped", the issue goes away. Please check the screenshots below as well as the simplified scene (max 2023).

[matanov]

It's from the triplanar tex. We have it already logged as VMAX-11623 and will bump it up.

[matanov]

Actually just use "Full-size"

[Alex_M]

Thanks! Yes, I figured I'll use full size textures for now. It's not a sophisticated project so everything fits in memory fine.

[Muhammed_Hamed]

Hi Alex_M

One note about On-Demand textures, you should avoid it unless you absolutely need it in the scene. We are aware it has issues.
Going forward, OOC textures should have a better alternative system, it is part of the reason we are not giving priority to polishing On-Demand. There will be texture compression soon as well, for now you should stick to "Resize" and "Full Size" only

Best,
Muhammed

[Alex_M]

Thanks for letting me know, Muhammed_Hamed . If I use "Full size" mode would I benefit from the memory conservation properties of .tx textures in my scenes? Also, what is "OOC textures"?

[Muhammed_Hamed]

If I use "Full size" mode would I benefit from the memory conservation properties of .tx textures in my scenes?

Hi Alex,

Full-size means the highest resolution mipmap will be used always, I believe there is no benefit to .tx format in this case

Also, what is "OOC textures"?

Out Of Core Textures, V-Ray will use system memory to store textures when you are at the ceiling of your VRAM. This means slower rendering, but the scene will not crash with out of memory errors. This will be part of our Kernel 3 in future, it is WIP now

Best,
Muhammed

[Alex_M]

Thanks for the clarification! So there's no reason to use .tx textures with GPU at this point is what you are saying? If I do use them anyway, would this be worse memory-wise or speed-wise than using non-tx textures with GPU?

BTW, I think it would be helpful to put a disclaimer for "on-demand mip-mapped" texture mode in the help docs so that people would know it has some issues. I was unaware that it's not recommended to use and always thought it's the best mode for complex scenes due to the memory savings.

[Muhammed_Hamed]

So there's no reason to use .tx textures with GPU at this point is what you are saying? If I do use them anyway, would this be worse memory-wise or speed-wise than using non-tx textures with GPU?

Hi Alex,
Using .tx format doesn't affect performance or memory usage at all for V-Ray GPU, the file format doesn't matter here. The highest resolution mip-map will always be used
I got a confirmation from our devs as well, I know it is not ideal at the moment. It has high priority on the development roadmap(with features like texture compression)

BTW, I think it would be helpful to put a disclaimer for "on-demand mip-mapped" texture mode in the help docs so that people would know it has some issues

Agreed, I will get to updating the GPU docs soon
This conclusion about moving on from Mip-mapped textures is fairly recent, but yeah. I hope we will have a better replacement soon

Best,
Muhammed