Hey everyone, I have these weird flickering or noisy reflections happening in my renders, especially where I used “Automotive Materials” from Epic marketplace. This issue is even worse in some other shots where the car is blurred, making flickering bokehs, or when an FG asset overlaps any reflective materials in the BG. I used some emissive lights for light tubes (placed in the ceiling), but the main source of light of the scene is from rect and point lights. I have noticed that these issues are not very noticeable within UE viewport, compared to the renders ( 2K, exr-PIZ, ACES).
I’m using lumen reflection with the following settings:
Quality: 5
Ray Lighting Mode: Hit Lighting for Reflections
High-Quality Traslucensy Reflections: Enabled
Max Reflection Bounces: 5
The console variables inside Movie Render Queue include:
r.Reflections.Denoiser.TemporalAccumulation: 0
r.GlobalIllumination.Denoiser.TemporalAccumulation: 0
r.RayTracing.Reflections.Shadows: 2
r.RayTracing.Reflections.SamplesPerPixel: 64
r.RayTracing.GlobalIllumination.Denoiser: 0
I played with different values for Temporal and Spatial sampling, but it didn’t fix the issue. Standalone Raytraced reflection method might be a solution, but I’m unable to use it as it changes the overall lighting of my scene and due to the limitation of available VRAM (6 GB). Is there any way to fix this while still keeping the lumen?
Thank you!