Foreground object alpha broken in R26

[Hurricane046]

Hello!

We've been used to framing full-frame shots by using letterbox.png hooked via native C4D material in the Foreground Object. It seems to stopped working in the R26.
I'm the third person at our studio to notice this issue and it's quite a bummer because we need letterboxes often and we don't want to resort to using polygon strips hooked to the camera, very dangerous in production.

Versions used:
C4D R23 + Octane 2021.1.1-(R2)
C4D R26 + Octane 2021.1.5-(R4)



Any ideas for a workaround? Thanks in advance!

[aoktar]

I found that latest stability revisions of back/foreground object is missing on alpha processing. I'm adding it.

[neue]

Was this never fixed? Still broken in 2022.1-[R5] (12.01.2023)

[iRota]

Hi, I am having he same problem since I updated to S26.
PR14 S26 Monterrey 12.6.3

[iRota]

Hi.
No news on this topic?

[elsksa]

Hello!

We've been used to framing full-frame shots by using letterbox.png hooked via native C4D material in the Foreground Object.

Out of curiosity, why this method instead of calculating and setting the aspect ratio & according resolution directly?
FYI, "letterbox" should never be rendered out, from the renderer or a motion-picture editing export (aside from some specific edge cases). That said, it coincidentally led to the discovery of that issue.