Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => Topic started by: Jpjapers on 2018-06-27, 09:07:55

Title: Bump maps on refractive materials dont render on back side.
Post by: Jpjapers on 2018-06-27, 09:07:55

If i apply a bump map to glass on a single face and look at it from the back the bump doesnt render if refraction is enabled and not 'Thin'

Scene and images attached

Title: Re: Bump maps on refractive materials dont render on back side.
Post by: Dung (Ivan) on 2018-06-27, 11:45:08

Hi jpjapers,

we've been able to reproduce this. We'll see what we can do about it :) I'll let you know the moment some new information is available.

Thank you for reporting this.

Title: Re: Bump maps on refractive materials dont render on back side.
Post by: Jpjapers on 2018-06-27, 15:17:06

Quote from: Dung on 2018-06-27, 11:45:08

Hi jpjapers,

we've been able to reproduce this. We'll see what we can do about it :) I'll let you know the moment some new information is available.

Thank you for reporting this.

Cool thanks :) Are you a new team member?

Title: Re: Bump maps on refractive materials dont render on back side.
Post by: TomG on 2018-06-27, 15:29:03

He's new-ish :) He's in the Company News (https://corona-renderer.com/blog/corona-renderer-2-for-3ds-max-released/) welcoming all the new coronauts to the team, "Ivan: QA specialist (better make sure you write good bug reports)" ;)

Title: Re: Bump maps on refractive materials dont render on back side.
Post by: Jpjapers on 2018-06-27, 15:31:48

Quote from: TomG on 2018-06-27, 15:29:03

He's new-ish :) He's in the Company News (https://corona-renderer.com/blog/corona-renderer-2-for-3ds-max-released/) welcoming all the new coronauts to the team, "Ivan: QA specialist (better make sure you write good bug reports)" ;)

Keen haha

Title: Re: Bump maps on refractive materials dont render on back side.
Post by: maru on 2018-06-28, 11:31:03

Workaround - use the multimap to texture different material IDs with different maps.
I do not however see any reason why this should not work with multi/sub-object material, so I would consider it a bug.
Additionally, the refraction gets all messed up when using multi/sub-object material, but I think this is a known "light transport" issue.

Title: Re: Bump maps on refractive materials dont render on back side.
Post by: Jpjapers on 2018-06-28, 12:41:36

Quote from: maru on 2018-06-28, 11:31:03

Workaround - use the multimap to texture different material IDs with different maps.
I do not however see any reason why this should not work with multi/sub-object material, so I would consider it a bug.
Additionally, the refraction gets all messed up when using multi/sub-object material, but I think this is a known "light transport" issue.

For now i just rotated the second pane of glass to face inward so i still see the bump :)