Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: mantaskava on 2019-08-11, 18:40:14

Title: Weird shading with anisotropy on
Post by: mantaskava on 2019-08-11, 18:40:14

Hey guys,

Any idea what is happening here? It seems this shading error occurs when anisotropy mtl is used on bent geometry. It wouldn't be such a surprise (probably) if this was happening on very heavily bent surface, but the rocking chair's frame isn't bent that hard.

Chair's frame
(https://i.imgur.com/S4EelFO.jpg)

Frame + test geo
(https://i.imgur.com/4wT7Am1.jpg)

Test geo flat
(https://i.imgur.com/F4jOjW0.jpg)

(https://i.imgur.com/Vbzgmir.jpg)

Thanks

Title: Re: Weird shading with anisotropy on
Post by: romullus on 2019-08-11, 19:23:55

Just a guess, maybe anisotropy orientation is set to UVW and actual UVs are messy?

Title: Re: Weird shading with anisotropy on
Post by: mantaskava on 2019-08-12, 12:21:26

Quote from: romullus on 2019-08-11, 19:23:55

Just a guess, maybe anisotropy orientation is set to UVW and actual UVs are messy?

Yep, it seems it was related to UV mapping. Not that uvs were messy, but I just had to change direction settings from "local axis" to "uvs".

Thank You, Romullus!

Title: Re: Weird shading with anisotropy on
Post by: maru on 2019-08-12, 17:15:25

Maybe it could be an instance of this? https://forum.corona-renderer.com/index.php?topic=11044.msg71290#msg71290
It also happens in other renderers.