Hello,
There's a few things I'm still very wondering about how to use Substance with CoronaMtl.
(I had no opportunity to 'play' with corona for a long while so may be I'm missing some very obvious reflex about classic corona workflow.)
1/ Overall... Beside the random crash in corona RT, would you recommend using Substance maps/node with corona ?
2/ I was trying a few substance files and I had the feeling the gamma outputed from substance node is wrong. See attached images below.
(With preferences Gamma&LUT set to 2.2 / Affects selectors.. / Affects material.. setup.)
It looks like it needs a gamma correction at least along the diffuse output (color correction with RGB gain at 0.4545) to be correct.
As shown below in attached images :
1 the 'coal' substance without and with gamma correction.
2 'pavement1' not corrected, without reflection, there's a lot of whiteburnt pixels even with little highlight comp and -3.5ev
3 'pavement1' corrected (all outputs), without reflection, looks a bit dark but the -3.5ev makes the whole image a bit dark.
4 'pavement1' corrected + reflections, just to bring back brightness over the diffuse, looks pretty correct or ?
The grey sphere was added with a R50G50B50 solid color into diffuse for 'realist' exposition reference
In the case output from substance needs gamma correction, which maps needs it ?
3/ How can the 'blur' parameters be conveniently managed while there's a single parameter on substance's node; if bump needs some blurriness, but I'd rather have most outputs sharp... Is there a decent in-between value or is it just a flawan argument against the use of substance ?
4/ Is the 'specular' output from Substance intended to end in 'reflection color' from CoronaMtl or more 'refl. glossiness'.. I'm not really convinced by tests with both, although as I'm already struggling with the gamma correction it's may be me feeding CoronaMtl wrongly in first place.
5/ About displacement, there I'm lost too.. first there's a 'relief balance' parameter in substance which control the ratio of bump/displacement outputs. But that parameter seems to be far from linear, with value '1' (aka more displacement and little bump) it suddently gives a way much more detailled displacement while superior values make the displacement output pretty undetailled.
What configuration do you use with 'bump', 'normal map', 'displacement' ? (And would they need gamma correction?)
Beside, there's an 'height' output, which gives a displacement map independant from 'relief balance'. Would you recommend using that output more than 'displacement' for the displacement input of CoronaMtl ?
https://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/CloudHelp/cloudhelp/2016/ENU/3DSMax/files/GUID-D98A5D87-EFF1-45DD-8132-69B86FB8454E-htm.html6/ Any advices you have figured out while using Substance with Corona ?