Chaos Corona Forum
Chaos Corona for 3ds Max => [Max] Bug Reporting => Topic started by: cecofuli on 2018-02-15, 19:38:49
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Hello,
some time ago I discovered a bug in the Translucency RE:
https://forum.corona-renderer.com/index.php?topic=12679.msg82030#msg82030
Today, I tried again with the new release of Corona, but, the problem, now, is also inside the Reflection channel.
I want to explain, because it's not so easy to understand:
As we know
--- CESSENTIAL_Reflect = Components_Reflect_DIRECT + Components_Reflect_INDIRECT ---
But, also
--- CESSENTIAL_Reflect = RawComponent_Reflect * SourceColor_Reflect ---
Well, we can recreate the BEAUTY by the sum of all CESSENTIAL. And, Corona does a good job =)
We can recreate the BEAUTY with be sum of CShading_Components. And, Corona, again, does a good job =)
But, it's not possible to recreate the BEAUTY by the sum of RawComponent*SourceColor channels (Diffuse+Reflect+Refract+Translucency)!
Why? Because if I compare the Reflections and Translucency layers (RawComponent*SourceColor) with the CESSENTIAL, they are different. I mean
(*) RawComponent_Reflect * SourceColor_Reflect is not the same and CESSENTIAL_Reflect .
(*) RawComponent_Translucency * SourceColor_Translucency is not the same and CESSENTIAL_Translucency .
You can download the 32bit file composition in this link. The psd file is already done to "play"with all layers.
--- DOWNLOAD --- (http://www.francescolegrenzi.com/Temp/Corona/0229_Corona_Composition_BUG_Sample.psd)
(http://www.francescolegrenzi.com/Temp/Corona/0228_Corona_Composition_BUG_Sample.jpg)
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Mmm.. I think that I understand where the problem is: the strong HDRI as a background.
In some "way", the HDRI is so bright and it creates problem in the multiplication (RAW*SourceColor).
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Maybe this is something related to image filtering? Have you tried doing the same thing with filtering and AA globally disabled?
https://coronarenderer.freshdesk.com/support/solutions/articles/5000516183