Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => Topic started by: v.p.vlasenko on 2021-12-14, 19:24:31

Title: Aerial perspective produces the wrong result in some situations
Post by: v.p.vlasenko on 2021-12-14, 19:24:31

All simple, check the images.

Top view, corona camera, not orthographic. Render with default corona material as override and volume effect 10 - increased to see result better.
The second image with greatly increased contrast in PS to see where that volume effect produces the strongest result.

Additionally - not sure but seems like in some situations it produces the wrong color, like in a clean scene with sun and default corona material as override - adding volume effect gives some red/purple tint to the scene.

The above is true for at least a few latest DB.

And few questions:
1. aerial perspective still not working with volumetrics, will that be fixed in some nearby future?
2. is it possible to make it true volumetric (checkbox to switch between shader and volumetric)? Or maybe it'll be even if we can plug some map into volumetric material scattering/absorption.

Title: Re: Aerial perspective produces the wrong result in some situations
Post by: GeorgeK on 2021-12-16, 15:37:16

Hi again, thanks for reporting this, hopefully its functionality can be improved.

(Report ID=CRMAX-1194)

Regarding your questions.

1. I can't say for sure, or if it's feasible.
2. Let me get back to you with that, if it's possible I will log it as a feature request.

Title: Re: Aerial perspective produces the wrong result in some situations
Post by: maru on 2023-02-15, 18:19:51

(Internal ID=1022943588)

Title: Re: Aerial perspective produces the wrong result in some situations
Post by: rozpustelnik on 2025-06-16, 10:03:10

This bug is still not solved after many years!
The latest report ID: (Report ID=CMAX-1700)

Title: Re: Aerial perspective produces the wrong result in some situations
Post by: rozpustelnik on 2025-06-24, 08:15:40

Come on. We are in the middle o 2025, three years weren't enough to address this problem?

Title: Re: Aerial perspective produces the wrong result in some situations
Post by: rozpustelnik on 2025-07-04, 13:57:32

I wouldn't care about it so much if I wasn't to render a set of aerial scenes, just in a top-down perspective, soon. Is there any work around this bug (without putting material in global volume mtl, which slows down render to a crawl)? Z-depth pass maybe? What about reflections?

Title: Re: Aerial perspective produces the wrong result in some situations
Post by: maru on 2025-07-04, 17:41:48

Random idea: create a Corona Volume Mtl and enable Emission in it. Note that LOWER values make it glow stronger. Then assign it to a huge box (or other geometry) below the camera. You may also need to enable some absorption to make it look better. It's just a workaround, but perhaps you could use it?

Title: Re: Aerial perspective produces the wrong result in some situations
Post by: rozpustelnik on 2025-07-07, 08:22:11

Thanks Maru. This is the last resort solution. Volumes are rendering with big penalty in comparison to aerial effect of CoronaSky.

Title: Re: Aerial perspective produces the wrong result in some situations
Post by: maru on 2025-07-07, 08:49:31

When scattering is disabled, and only absorption and emission is used, it should render almost instantly.

Title: Re: Aerial perspective produces the wrong result in some situations
Post by: rozpustelnik on 2025-07-07, 11:05:13

Thanks Maru.
Nevertheless, I'd like to see the original solution implemented without the bug, because camera in my scene starts by looking top-down, but after some time it smoothly shifts its tilt and starts to show the horizon... On top of that add some reflective materials with accurate reflections on them, on objects close to the camera...