I have a big issue getting a noise free render with the karma volume shader.
It's a simple scene with some clouds (based of some of your templates), a karma volume material and a physical sky. When I render it (on our farm) it feels like it reaches a limit no matter what settings I increase and it just looks fairly undersampled.
I'm using XPU and the render settings I've increased are
pathtraced samples 128->1024
lightsampling quality 1->5
volume step rate .25->1
all the limits have been upped. the only one I found had an effect is the obvious one, volume limit. it actually affects the noise in the image but up until a certain point, after 5-6 limits, the noise stays the same. After trying various parameters one by one it also seems like it's the only one really doing any effect on the image.
Here is a simple screen of the max level I can clean the noise to:
Thanks for any comment and answer, I'm sure it's just me who is new to karma and missed something obvious but I just can't find what it is. Things I can think of is if I've missed some threshold parameter or similar.
Using H20.5 but have access to 21.