I have few materials. When applied to object separately speed ranging 7-14M. When mixed in multilayer material with corona distance - speed is 700k +/-
Same problem with opacity. I have a landscape model + a lot of buildings with pools. Bottom of pools below ground level - instead of cutting geometry I used corona distance to cut it during render - speed dropped twice.
Maybe that’s correct behavior with opacity, but 10 times slowdown with mixing materials looks strange.
Hi,
Is this described in the scene you already sent to me? If so can you describe which materials and objects I should look at. And some reproduction steps on how to reproduce this slowdown.
Cheers,
Rowan
(Report ID=CRMAX-265)
Yes, landscape model there (island)
There are 4 materials mixed in multilayer material. Each of those materials applied separately gives a way higher rays/s. Seems like from 7 to 14 million on my PC, but mixing them in multilayer gives something around 1M.
Actually I may be wrong and that not corona distance - I didn’t tried a bitmap mask, maybe something with multilayer material.
Anyway, such slowdown looks weird.
Was anything discovered regarding this? I’m having the exact same issue. Corona distance maps in a corona layered material results in a perfomance drop from around 20mil rays to 5-6mil.
Did some tests (see screenshots) and it’s clearly the distance maps causing these huge drops in performance.
A big sinner is also having a refractive material (I’m projecting lakes on the terrain via a water material and distance map).
Sum-up:
no bitmap white base only : 31mil rays total
no bitmap white base layered with mix of 3 standard max maps (noise, cellular and falloff): 19mill
4k bitmap as base layered with mix of 3 standard max maps: 17mill
4k bitmap as base layered with 1 white base mat and 1 distance map: 15mill
4k bitmap as base layered with 1 white base mat 1 water material and 2 distance map: 7.7mill
For each extra (non refractive) material and distance map, performance seems to drop 2mill rays.
Hi,
This is with our dev team, unfortunately I have no further update at the moment.
Would you be able to provide your testing scene also?
Thanks,
Rowan
