GPU Profiling - Clear Scratch Cubemaps & Compute Average Brightness - High ms

Development Rendering
1

I’m creating a level with a large 4k*4k landscape and I’m in process of optimising it as best I can.

In the GPU Visualiser, there are some processes that I can’t find any reference online too.

Clear Scratch Cubemaps 3.82 ms
Compute Single Average Brightness From Cubemap 4.17 ms
Compute Diffuse Irradiance 4.20 ms

These three processes happen before the scene rendering and total 12.19 ms

Any ideas what settings effect these values ?

GPUProfile.png
GPUProfile.png1928×1048 113 KB

2

Do you update reflection captures every frame?
Is your SkyLight movable?

4

My reflection capture and my skylight was Stationary. I’ve set them to static and its brought the frame time down about 3ms. I think you’re on the right track, with it being to do with my skylight, reflections ect. Maybe it’s normal to be quite large performance hit with a big scene ? Thank you for your help.