Specular Halo Around Transparencies with Alpha Background Tweet

[lunarstudio]

I have a complex model (glass, glossy materials, etc.) that requires a transparent background.
The lighting is a lightbox with three white discs: top, left, and right.
Sometimes I render angles with the hidden lights directly behind the model.

When I render, a noticeable white halo appears around the model including non-glossy materials.

If I untick the "Visible on Specular" checkboxes for these lights, the halo disappears, however I also lose some much desired highlights on the glossy mats. It's acting like rim lighting but it spreads to areas that I don't want.

Post processing is turned off.

How do I remove this halo?
Unfortunately, I cannot show this scene.

Thank you.

[paride4331]

Hi lunarstudio,
I don't understand you very well.
Could you share with me (in PM) your scene via wetransfer using 3dsmax archive: File > archive?
Regards
Paride

[paride4331]

Hi lunarstudio,
I saw your screenshot, you could try checking "keep environment" in Kernel type next "alpha channel" option.
Regards
Paride

[lunarstudio]

Update. With Keep environment checked the glass in the background ends up going white. Without it, it is transparent again. I need this to be transparent.

2018-10-25_12-18-29.jpg (14.65 KiB) Viewed 2588 times

[paride4331]

Update. With Keep environment checked the glass in the background ends up going white. Without it, it is transparent again. I need this to be transparent.

2018-10-25_12-18-29.jpg

Hi lunarstudio,
did you check affect alpha in specular material?
Regards
Paride

[lunarstudio]

"Affect Specular" doesn't exist in the Specular Material.
Only "Fake Shadows" and " "Affect alpha" underneath my glass material.
"Affect alpha" is checked.

[paride4331]

"Affect Specular" doesn't exist in the Specular Material.
Only "Fake Shadows" and " "Affect alpha" underneath my glass material.
"Affect alpha" is checked.

Hi lunarstudio,
I told affect alpha not affect specular.
Said that, it should work, or what I see beyond the glass, in your scene, is not evironment as I supposed.
Regards
Paride

[lunarstudio]

I tried this before as well as many different glass mats. Still doesn’t work.

[paride4331]

Hi lunarstudio,
To figure out, I have to test your scene, could you share in private message it, deleting partially scene, but leaving glasses, lights, sun, emitter objects, environment, camera.
Saving it as 3dsMax archive: file > archive.
Regards
Paride