Tiled exr doubles render time

[cgdom]

I’m seeing a doubling of render time when I use tiled exr’s as a texture. Is this typical or is something going wrong ? I have a single asset that intried tiled vs untiled exr’s on and this is the behaviour i’m seeing.

[Svetlozar Draganov]

Tiled EXRs will certainly affect render times negatively since as displacement and proxies are loaded/unloaded during render time, this makes them memory efficient but at the price of longer render times.
You may try to increase Tiles Texture Cache Size here to a higher value, and you can also set Dynamic Memory Limit to a 0.

If that doesn't help please pack the scene and send it over for investigation, it might be a bug which needs to be addressed.

[vlado]

It would be better to use .tx files rather than tiled OpenEXR files for 8-bit textures like diffuse color etc. This will save RAM and might help to speed things up. Obviously for displacement you will still have to use OpenEXR and in that case Svetlozar's suggestions could help.

Best regards,
Vlado

[thescopeteam]

funny, you are telling vray users to use an Arnold tool for vray? when does Chaosgroup come up with a solution?

[beenyweenies]

funny, you are telling vray users to use an Arnold tool for vray? when does Chaosgroup come up with a solution?

Tiled EXRs are going to be more resource hungry than a single EXR. That’s not exactly shocking news, and it’s not a Vray “issue” it’s just a a fact. So he’s suggesting you not use them unless absolutely necessary, such as with displacement. .tx files might help you free up memory to make room for that in your memory budget.

[psanitra]

funny, you are telling vray users to use an Arnold tool for vray? when does Chaosgroup come up with a solution?

If you did not noticed, tx is not Arnold exclusive, nor is maketx. Maketx belongs to OpenImageIO. Yes, Arnold use tx format and ships with maketx, so does Redshift, so does Renderman(tex),Vray use .tx too. It became standard, because there is nothing better open sourced,faster and compatible out there. I don`t see how "come up with solution", aka "reinventing" the wheel whould help.

[Morbid Angel]

It would be better to use .tx files rather than tiled OpenEXR files for 8-bit textures like diffuse color etc. This will save RAM and might help to speed things up. Obviously for displacement you will still have to use OpenEXR and in that case Svetlozar's suggestions could help.

Best regards,
Vlado

I would add to this that using .tx will automatically determine during conversion the bit depth needed. So if you have a mix of textures, 8 bit, 16 half float, 32 full float .tx will save those respectively. A .tx is a tiled tiff and can be perfectly used for displacement and other float operations.