sunset animation - strange halos, flickers and flashes

[david_buerger]

hi,
when rendering an animation with a sunset-sequence (animated vray sun + sky + clouds)
there are always some frames that flash/flicker.
AND there are some strange halos/Shadows around the clouds and (sometimes) the objects.

Just at the time the Sun sets and the sky gets dark.
before and after the sunset it renders fine.

I have tried various settings, but nothing changes, even with ultra settings...

Motionblur is turned Off in Max and Vantage
Is there a workaround or a fix?

usually i render this few frames twice: one with only the sky and one complete +alpha channel and fix it in post.
but its far from perfect.

https://youtu.be/Ugl4KR7FUNY

3dsMax 2024, vray 6, Vantage 2.2.3, RTX 4090

This Scene contains Forest Objects (background Trees) and Anima 4d people

Rendersetttings: Video @ 1440p, ultra-settings, 600 samples, nvidia denoiser, dynamic Textures Off, LC Sample limit 1024, LC retrace 2,5, LightsTree 4

attached a frame with heavy ghosting and weird looking clouds

Thanks, Dave

[npg]

We have this fix in the 2.3.0 changelog:
- Fixed wrong cloud shading with sun slightly under the horizon

I'm not sure if this is one of the issues you observed - it was causing the clouds to go white for a few frames while the sun dips below the horizon.

But the blur is probably due to a denoiser issue or a live link synchronization issue. Is there improvement is you set a longer timeout in the live link settings dialog in Max, like 2 seconds instead of 0.1 ?

[david_buerger]

Hi and thanks for the quick reply!

i rerendered the animation with the new vantage 2.3 update and that fixes the clouds - flashing - problem

and the blur/halo problem was fixed by using the legacy denoising mode

i have not tried the live link settings you suggested, but good to know that there ist someting to play around

thank you very much and have a nice day
Dave

[Luma3d]

Oh...need to update. I ran into the same issue rendering out solar studies yesterday.