Diffuse Lighting

I am working on a mountain landscape( very large object, Rhino V5, Rendered View) and I need to get smoother diffuse light shades.
Maybe its somehow possible to increase the resolution of these shadows?

Grateful for any help.

you could try to experiment with sun&skylight


Hello - this will depend, or be limited by, the mesh itself - what does that look like? You see some of it here
image image

The triangles are fairly large.

If I understand you, this would probably be as good as it gets with this mesh. If you want to smooth the mesh, you can have a try with WeaverBird http://www.giuliopiacentino.com/weaverbird/


it may make the mesh unmanagably dense, however - use one level at a time.