Chaos Corona for 3ds Max > [Max] Bug Reporting

Problems Rendering Animation!

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dfcorona:
I finally finished this project and it's ready to be rendered out as an animation. I rendered the first camera scene that was 253 frames. But certain frames all of a sudden the materials change there reflections and refractions, some objects losing reflections all together.  I even tried rendering just those frames and it still happened. I don't know why this is happening. I am rendering locally on one machine, so it's not a network issue. 


Windows 11 Latest
3ds Max 2025.3
Corona Update 1 Hotfix 1
TR 7980x
192GB Ram

dfcorona:
Just tried "Corona 12 Update 2 RC1". Still the same problem.

Update: Tried merging into a new scene and everything, no change.  Frame 104 renders perfect, frame 105 renders with materials all messed up every time.  Makes no sense.

maru:
Please check this article: https://support.chaos.com/hc/en-us/articles/33844546706193
Most likely, there is an open (non-capped) object with refraction and/or volumetric effects close to your camera. This has the same effect as submerging your camera in a refractive/volumetric medium. The solution would be to find the problematic object and make sure it is closed (capped, no open loops), or change its material to remove refraction or volumetrics. There is a script at the end of that article which you can use to remove volumetric effects from all scene materials. While it's not a solution, it would at least tell us whether this is really the problem.

dfcorona:
Hi Maru,

After hours I found the problem. This definitely looks like a BUG. It came down to a lamp that had a shade that used translucency and refraction on the same material. The minute I turned off the refraction on the material the animation renders out perfect now with no changing materials. I can send you the lamp model if you wish to investigate?

maru:
Sure, you can send it here: https://support.chaos.com/hc/en-us/requests/new
But this still sounds like "camera inside refraction/volume" issue. We would like to at least detect this situation and inform the user. We have an internal task for this.

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