Chaos Corona Forum

Chaos Corona for Cinema 4D => [C4D] Bug Reporting => Topic started by: davetwo on 2025-03-19, 18:31:26

Title: Decal on glass, big refraction problems
Post by: davetwo on 2025-03-19, 18:31:26
I've been working on a bottle project, where I had set up the glassware to use decals for the embossing (only effect displacement). I thought it as working reallly well and giving me lots of control, until i realised that if the decal is not appllied the refraction looks completely different!

Decal with bump instead of displacement it still wrong. But UV mapping and applying displacement via the material  works as expected - so it seems to be a decal issue.

Sometimes you hardly notice, but sometimes it is VERY different. It seems to be buggering up the IOR value of either the glass or somehow the volumetric liquid.

I can't share the real files so there's a simple scene attached below.

Unfortunately this means deacals cannot be used on transparent materials properly.
Title: Re: Decal on glass, big refraction problems
Post by: TomG on 2025-03-19, 19:16:34
Can you share that very simple scene version, or at least screengrab both the base glass material and decal material set up? Thanks!
Title: Re: Decal on glass, big refraction problems
Post by: romullus on 2025-03-19, 19:25:44
TomG, there is attached zip file in the original post...
Title: Re: Decal on glass, big refraction problems
Post by: TomG on 2025-03-20, 12:18:55
Aha, I read it as two separate images with two separate links heh, and not a zip link and image link. TY!
Title: Re: Decal on glass, big refraction problems
Post by: Avi on 2025-03-24, 17:14:11
Hi,

I was able to repro this issue and have logged it in our system to be further reviewed by our devs.

(Report ID=CMAX-1551)