geosphere as background

[leo_surrealismo]

yes, but look at the wrong speculars on the image.  They turn out black.

[PROH]

An empty GI slot = black light.

[leo_surrealismo]

If you see on both images, both has GI unchecked and they behave diffrently.
anyway, I tested your suggestion and still does not work.

[leo_surrealismo]

I have uploaded the scene thru dropbox, if support can look at it.

thanks.

[leo_surrealismo]

I did not manage to solve this problem.
I am in onother one and facing this problem again.
and, no, it is not because I have gi unticked.
could you guys help me out what is wrong on this setup?

[maru]

I think everything was already explained in this thread. Corona doesn't "like" fake effects such as objects not casting shadows and they can lead to shading issues. There is at least one known workaround to this, but it is not perfect. Can you show your results? Maybe then it will be possible to come up with some additional ideas.

[leo_surrealismo]

I mean, I know it is a limitation, but would it be addressed at some point?
these is the output I'm getting.... the spherical background doesn't get reflected into the kitchen backsplash.
Hopefully you could give some ideas.

[polygon3di]

In this case I use corona light with disk shape targeted instead corona sun. Try to set direction, intensity and radius, imitating the sun. The main idea that light sourse was in front of  plane with corona light material. Check that light from fake sun should be uniform. I know it`s cheating but maybe it will be acceptable for not large scene.
Here my tutor

[Tom]

Interestingly, I just discovered that I had encountered this bug in my last scene without knowing where it came from. I had thought that my backplate was the culprit but didn't have time to address the issue. So thank you @leo_surrealismo for this very informative thread.

The workaround seems effective, it's always better than fixing the bug in Photoshop :) but I see that the post dates back to 2021: so it's not planned to find a fix in a future Corona version?

[Tom]

I think everything was already explained in this thread. Corona doesn't "like" fake effects such as objects not casting shadows and they can lead to shading issues. There is at least one known workaround to this, but it is not perfect. Can you show your results? Maybe then it will be possible to come up with some additional ideas.

I've setup a simple scene trying to replicate the workaround but it doesn't work 100%: it does get rid of the black sun highlight, but then the backplate is not visible in the reflection anymore, as said @leo_surrealismo.

Is there a way to have both a normal highlight and the backplate being reflected?

See attached screenshots and scene (3ds Max 2023 + Corona 10HF2)