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.

yt vantage forum

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.