Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: Cellula on 2021-07-22, 16:42:04

Title: Roughness vs Glossiness in Corona 7
Post by: Cellula on 2021-07-22, 16:42:04

Hello.

I'm having some issues regarding the new Roughness system in the Corona material version 7.
I cant seem to achieve the same results that i had with the old Glossiness map.
I've tried to tweak the curves with Corona color correct but the result its always the same "flat" reflection... In the attachment you can find a screen capture with the 2 examples for comparison.

Any thoughts on this issue?

Thanks in advance. 

Title: Re: Roughness vs Glossiness in Corona 7
Post by: TomG on 2021-07-22, 16:56:04

Both seem to show the Phys Mat. If you have one in Glossiness mode and one in Roughness, remember that they are the inverse of each other, so you would need to invert the map.

Title: Re: Roughness vs Glossiness in Corona 7
Post by: Cellula on 2021-07-23, 11:20:40

Thanks for the quick reply.

I've tried to invert the map but the result still doesn't match the quality of the Glossiness version (see the first attachment).
The only solution i found was to do this strange tweak with Corona Color Correct (second attachment)
This process seems quite counter intuitive...
Any thoughts on this issue?

Title: Re: Roughness vs Glossiness in Corona 7
Post by: romullus on 2021-07-23, 12:07:09

Don't use Corona color correct node to invert map, use standard output node instead. The former is inverting in sRGB space and the latter does that in linear space, which is what you need here.

Title: Re: Roughness vs Glossiness in Corona 7
Post by: Cellula on 2021-07-23, 13:49:22

Ok thanks for the advice.
Cheers

Title: Re: Roughness vs Glossiness in Corona 7
Post by: GeorgeK on 2021-07-23, 14:40:20

Quote from: romullus on 2021-07-23, 12:07:09

Don't use Corona color correct node to invert map, use standard output node instead. The former is inverting in sRGB space and the latter does that in linear space, which is what you need here.

I guess that's something that needs a note or clarification on the helpdesk article for CoronaPhysical mtl, thanks for pointing it out.

Title: Re: Roughness vs Glossiness in Corona 7
Post by: romullus on 2021-07-23, 14:55:41

A tooltip in the texmap itself, would be even better ;]