D5 Render Version:
2.11.1.016
Graphics Card:
RTX 4090
Driver Version:
Studio 581.29
Issue Description:
Screen flickering during using high amount of clouds with shadows enabled
Screenshots/Videos Description:
included
Steps to Reproduce (optional):
Make high amount of clouds with shadows turned on. Probably on reflective surfaces
flick(4).zip (2.8 MB)
Hi @Smolak
I just tried it on my test file with maximum clouds, enabled Shadow, and Fog, but still can’t replicate it. Can you send us this specific file? Thanks.
Let me know if you have sent it.
I noticed that I have this issue while frame generation is turned off. When I set it to Auto or On this issue is gone.
It can even render with fully clouds but without cloud shadows at all when frame generation is turned off.
Is this issue related to the one you have posted before? You did mention you’re enabling custom GI + Enabled the shadow
Clouds shadow issues - Get Help / Tech Support - D5 RENDER FORUM
I tried using lowest settings for GI and reflection without success. Enabling frame generation was good before but when scene was growing, when I added many more object it started to flicker again.
This is not only flickering but while accumulation it can render just like without cloud shadows at all. It looks like cloud shadows are leaks Sunlight.
It was most probably caused by my custom Nvidia driver settings. When I reset them to default this problem gone. I hope 
Unfortunately it started to flicker again. It must be something random that cause this issue.
Strange but when I restarted D5 it works fine again. So it looks like it is not driver issue but something cause that there is need to restart D5.
Hi @Smolak
Were you able to share this file before? If you haven’t please do,
Hi @Clov
This is big scene 2GB I will send it soon. Unfortunately when scene is small I don’t have this issue.
I found that it stopped flickering when I set DLSS version in Nvidia panel to “use 3d application setting”. Before I had - use latest :
I will test this more using default DLSS settings.
Still flickering, this is totally randomly, independent from any settings.
Finally I found issue ! When I created video to another thread about volume fog issue I noticed something very strange.
While using fully clouded sky Sun is not visible. But when this invisible Sun position is obstructed by object it started to be visible ! In this example
Cloud_shadow_flicker_1.zip (3.0 MB)
you will see that this Sun start to cast shadows when it is visible between tree leaves and it start to flicker.
Please see when I move camera fast this visible between leaves Sun start to fade when it is not obstructed by tree object.
Cloud_shadow_flicker2.zip (1.2 MB)
Scene :
cloud_sky_flicker.zip (1.2 MB)
But I have scene when it flicker and Sun is not obstructed by object while looking to it from Camera position. Probably this needs more investigation from D5 technical team - in which situations Sun stays visible from behind clouds. I found first one, probably there is more.
For example - flickering is not visible when D5 screen is very small, when I resize it to very large size it start to flicker.
Here is good example :
flick2 (2).zip (3.6 MB)
It show that this issue occur only when many objects is visible in scene.
It stop flickering when I resize D5 window to fullscreen for a moment. After that I can reduce D5 window size and it still works fine. Very strange.
I use widescreen monitor with resolution 5120x1440 so normally I use D5 on only half center.
Hi @Smolak
This seems to be unnatural, we’ll be investigating this further. Thank you so much for your detailed information.
