I’ve a problem with the difference between preview (nice) and final rendering and contact shadows (ugly).
In the preview in EEVEE the shadow looks nice:
Random guess here, it would be helpful if you shared more information on how you are getting the shadows.
Are you by any chance using subdivision and do you have viewport subdivision levels turned up but not the render subdivision levels?
Some subdivision modifier accidently set in preview to an higher value than actual render ???
Thats the solution!! I have used the Rock Generator of blender. There are a lot of modifiers, on the top the list are two subsurface-Mods. I thought, they are all applied after generation. My mistake.
I’ve apply the one second modifier and the problem is gone.
How could i have missed this avatar for soo long ???
My nickname says it all I think, You are also a oldschool-nerd like me?