Corona Bitmap/Bump map problem

[GeMeMe]

Hi everyone,

I've run into a problem with bump mapping, of all things. A simple Corona Bitmap bump map, connected to the bump slot of a Corona Physical material should produce the output in the first image. The second image shows what I get instead. The normal vector calculation is off; the y-component seems to be inverted.
If I exchange the Corona Bitmap shader for a simple Bitmap shader, the bump effect is rendered correctly (this is how I got the first image). This seems to indicate that there is some problem with the way Corona Bitmap is sampled. Can anyone confirm?
I certainly hope that it's just me missing something obvious, instead of there being something seriously wrong with Corona for C4D. If so, please point me to my mistake.
Anyway, and feedback is appreciated!

[GeMeMe]

Somebody, please? At this point, I really only need to know who's problem this is. Am I doing it wrong, or is this something the devs should have a look at? Same goes for my other bug report.

[burnin]

Yes, it seems like "CRN Bitmap" has improper 'orientation'. Native one is fine.
Tested w/ Version • 13 (Daily Build Jul 18 2024) • C4D 2024.4.1 • ms W10

[GeMeMe]

Thanks for confirming, burnin.
This has to be a bug introduced in a recent version, right? I can't imagine such a fundamental problem being there longer without anyone noticing.

[bnji]

Hello GeMeMe,

Thank you for bringing this to our attention.
I'll report this to the dev team for further investigation.
Please consider that finding the root cause of the issue may take some time, but our dev team will work hard to find it.
In the meantime, I'll suggest using native Bitmap shaders instead.
(Report ID=CC4D-805)