Does anyone else have issue with multisub object slowing down render

[Anonymous]

I just came back to max after quite a few years and had to learn Arnold as a render engine. I kitbashed a secene together and the models I used, use multisub object materials. i converted them over using the scene converter but the render times are just ridiculous, upward of 12 hours at 1080 resolution with default render settings. im using an HDRI environment map for lighting. Has anyone else ever experienced this. I would rather not have to go back and rebuild textures as Arnold Surface materials, Id rather leave them as physical materials. The multi-sub material is comprised of about 45 or so individual textures and seems to just bog down Arnold.

[thiago.ize · Accepted solution]

I'm not familiar with max, but I'm going to guess you didn't convert your textures to .tx and this is causing the arnold texture cache to thrash. My understanding is that there's work on making this more automated in max, but in the meantime I can imagine two options:

1. Convert to .tx textures.
2. Increase your texture cache size to be almost as big as the amount of RAM you have on your machine.

If that doesn't help, then providing the detailed arnold logs would help so that we can see what version of arnold you're using and what other settings are being used, etc.

[Anonymous]

converting to .tx worked like a charm