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

CoronaLightMtl opacity bug using CoronaSky Volume Effect

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nathanwruck:
I use 3dsmax 2024 and I like to use mountain backgrounds with CoronaLightMtl and I use opacity map to cut out the shape of the mountains to use the sky of CoronaSky, but when using the Corona Sky "Volume effect" it affects the material where nothing should appear because it is 100% opacity... Fixing this would be important... Thanks

Avi:
can you share the scene? You can also share it privately by starting a ticket with us: https://support.chaos.com/hc/en-us/requests/new

Note: you can also share images showcasing the problem (renders, viewport screenshots, material setup) here so that we can understand better what is going on

nathanwruck:


You can see that there is a lighter rectangle where the Volume Effect is affecting the opacity of the mountain.

Avi:
Hi,

I was able to reproduce this issue on my end. I have logged this in our system.


(Report ID=CMAX-1260)

For now, you can use corona physical material with self-illumination or use Corona color correct to increase exposure of your backplate as a workaround.

pokoy:

--- Quote from: Avi on 2024-09-05, 10:41:02 ---...
For now, you can use corona physical material with self-illumination or use Corona color correct to increase exposure of your backplate as a workaround.

--- End quote ---
But... how would increasing exposure of the backplate help if the area with 0% opacity would *still* render brighter for anything behind it?

I guess the volume effect needs to be looked at in general, it's producing unexpected results in too many cases, especially since problems have been reported for quite some time now.

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