Chaos Corona Forum
Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: v.p.vlasenko on 2021-02-09, 13:26:31
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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.
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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)
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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.
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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.
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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