Corona Renderer Forum

Corona Renderer for 3ds Max => [Max] I need help! => Topic started by: Basshunter on 2021-09-04, 20:58:26

Title: Clear coat absorption as "stain" parameter for wood materials
Post by: Basshunter on 2021-09-04, 20:58:26

From what I got on the last Corona 7 webinar at 10:58, clear coat absorption could also be used as a "stain" parameter to completely alter the color of wood materials without having to use new textures or color correction node.

So I could start with a basic natural wood texture and then play with the absorption parameter to find the right stain color. Is that one of the intended used for this parameter?
Title: Re: Clear coat absorption as "stain" parameter for wood materials
Post by: TomG on 2021-09-06, 12:47:56
Yes :)
Title: Re: Clear coat absorption as "stain" parameter for wood materials
Post by: Juraj on 2021-09-07, 00:30:00
For me it's debatable how long it's still physically sound as dyes and stains are quite penetrative as opposed to lacquers, the latter being more fitting to be simulated by clear-coat.

Also, since most lacquered woods are both (or all three) dyed/stained and lacquered, the Physical Material would need multiple clearcoats and definable thickness (Maxwell had that kind of shader), so with CoronaPhysical having just single, you would have to go to CoronaLayered material again.

This would be well worth the research.
Title: Re: Clear coat absorption as "stain" parameter for wood materials
Post by: GeorgeK on 2021-09-07, 09:57:17
From what I got on the last Corona 7 webinar at 10:58, clear coat absorption could also be used as a "stain" parameter to completely alter the color of wood materials without having to use new textures or color correction node.

So I could start with a basic natural wood texture and then play with the absorption parameter to find the right stain color. Is that one of the intended used for this parameter?

You can also refer to the following discussion as some things are explained in more detail with some free samples. https://forum.corona-renderer.com/index.php?topic=31802.msg189217#msg189217
Title: Re: Clear coat absorption as "stain" parameter for wood materials
Post by: burnin on 2021-09-07, 13:37:39
For me it's debatable how long it's still physically sound as dyes and stains are quite penetrative as opposed to lacquers, the latter being more fitting to be simulated by clear-coat.

Also, since most lacquered woods are both (or all three) dyed/stained and lacquered, the Physical Material would need multiple clearcoats and definable thickness (Maxwell had that kind of shader), so with CoronaPhysical having just single, you would have to go to CoronaLayered material again.

This would be well worth the research.

"Clearcoat" as a separate I/O material/shader would have made it possible to create such kind of multi-cotaed materials. Especially, if it also featured various layering options.

ie.
LuxCore's "Glossy Coating" material (https://wiki.luxcorerender.org/LuxCoreRender_Materials_Glossy_Coating)
Quote
Glossy coating is an "empty gloss coating" material. It is used to add gloss layers on top of other materials. It is something of a special glossy material that has no base reflector of its own, but rather takes another material node as its base.
Title: Re: Clear coat absorption as "stain" parameter for wood materials
Post by: Juraj on 2021-09-10, 17:00:26
Yup, some new material systems like the latest one from Disney is based fully on layering. There is no base materials and layered material anymore. Everything is a layer.

I tested it with existing way anyway, and it's pretty cool way to do wood :- ).