Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: actrask on 2019-05-16, 17:06:55

Title: Plugging Quixel maps into Corona
Post by: actrask on 2019-05-16, 17:06:55
I can't find a straight forward explanation of where Quixel maps are supposed to go in a Corona material.

Here is what I understand and don't:

Albedo - diffuse
AO - multiply over diffuse if needed
Bump - additional bump
Cavity - ??
Displacement - displacement
Gloss - gloss
Normal - bump
Roughness - ?? (works as gloss if inverted)
Specular - reflection?

Sometimes there is a "metallic" map, where does that go?

This is an interesting thread but it's hard for me to parse: https://forum.corona-renderer.com/index.php/topic,10436.0.html. There is a .zip attachment in that thread that has "Corona.jxs" and "Corona.xml" in it, what are those for?

Let me know if there are other guides for Quixel and Corona workflows that I missed, thanks!
Title: Re: Plugging Quixel maps into Corona
Post by: romullus on 2019-05-16, 19:35:53
For Corona use, you don't need all the maps that quixel generates. What you need, is:


You may also multiply AO with albedo, if you feel that you want more contrast (not recommended). Cavity And AO also can be used as masks to add additional grunge to your material. Other maps are not needed.

P.S. don't forget that albedo map should be loaded with automatic gamma, but all the other maps should be loaded with gamma 1.0
Title: Re: Plugging Quixel maps into Corona
Post by: Njen on 2019-05-16, 19:45:08
What you described is for a dielectric material. For a metallic material, albedo goes into the reflection colour and diffuse is black. Then the metal mask (also known as metallic, metalness) mixes between the two materials (using a layered material).
Title: Re: Plugging Quixel maps into Corona
Post by: John.McWaters on 2019-05-17, 15:44:33
Quote from: Njen on 2019-05-16, 19:45:08
What you described is for a dielectric material. For a metallic material, albedo goes into the reflection colour and diffuse is black. Then the metal mask (also known as metallic, metalness) mixes between the two materials (using a layered material).

Can you please elaborate on this more? When you say the metallic map mixes between the two, how do you set that up? I thought the metalness map was plugged into the fresnel input.

I wish there were better naming conventions for maps because nearly every source for high quality textures uses slightly different naming conventions.
Title: Re: Plugging Quixel maps into Corona
Post by: Njen on 2019-05-17, 18:56:07
https://forum.corona-renderer.com/index.php?topic=21481.msg132457#msg132457

Though since that post, the IOR value in a Corona material is now able to go well above one. So you don't need that disableIOR node anymore, just enter in a value of '99999' for the IOR of the metallic layer material.

The two falloff maps used in the reflection colour and glossiness are weighted exponentially to the right. So the curve would start low, then only ramp up close to the right side (I can't post a screenshot of the curve because I am at work).