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Cathryn-Jane Easthope avatar image
Cathryn-Jane Easthope asked

aiAtmosphereVolume not rendering properly as a PNG using IPR

Hello. I am rendering a scene with an aiAtmosphereVolume from an area light but although it saves fine as a JPEG from an IPR render, when I try to save as a PNG I get a grey background in that area, almost like it has been turned into an alpha channel. Making an ordinary render takes longer but does not have this problem. What am I doing wrong?
I'm using Arnold 4.2.1 on Maya 2022.

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Stephen Blair avatar image
Stephen Blair answered

IPR does multiple progressive renders, so it should be at least a bit slower than a final render.
For File > Save, did you try changing the Save Options?

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Cathryn-Jane Easthope avatar image
Cathryn-Jane Easthope answered

Thank you for the reply Stephen. IPR seems faster than a standard render, which is why I use it.
In the render window Save menu I just use PNG in color managed mode. Render settings are below as well as the PNG and the JPG. I am using a Macbook Pro with Maya 2022 and Arnold 4.2.1. The JPG renders a sky but the PNG just shows grey (shows here as white) where the sky is. If I open it in Photoshop, the grey is an alpha.


screenshot-2021-12-15-at-133425.png to-send-to-forum.pngto-send-to-forum.jpg


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Cathryn-Jane Easthope avatar image
Cathryn-Jane Easthope answered

I hope you're still here @Stephen Blair. I did a very simple scene; a single area light with aiAtmosphereVolume and a plane, and PNG or EXR just does not show aiAtmosphereVolume . It doesn't matter if if I use IPR or standard Arnold rendering. On the other hand, JPEG and PSD do. You couldn't make a simpler scene. Is this a known bug?



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Stephen Blair avatar image
Stephen Blair answered

It's not a bug. It depends on what you use to view the png file, and what that viewer does with the alpha.


png-unassociated-alpha.png


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