Hi all.

This is something that has been bugging me for some time. I generally find that Vue antialiasing is too strong, especially on rocky materials.

I have tried the following things:

• Crisp antialiasing and better quality. This is effective on most items (including plants), but rocks still look too smooth. 
• De-activate antialising on material. Makes the whole scene look crappy, including elements that are near the rocks. It would be handy to be able to de-activate antialiasing on a sub-material, but alas it is not yet possible.

Is there another trick or should I merely add more bump to my material?

Below is the scene I am working on

And the antialising settings for this render

I think this isn't due to AA settings, but material size and bump being too low. Try changing material size to something smaller, and up the bump to get more definition.

Thanks for this answer. I made some changes and it now looks better.

I have yet another question: there is a material I like in Vue that is called "natural 3". A mix of a brown moss like material and a clearer stone like one. Very interesting for images of the Highlands in winter for instance.
When you render it, the brown material clearly looks as if it were above the other. It does this even if you swap materials. Is there a way to make the brown material appear to be under the other?

The  brown material is supposed to appear at low altitudes and on flat surfaces, but it also depends on a function. In the advanced material editor; change the low altitude value to a higher percentage, like 100% for a start, it will force Vue to place more precisely the material onto the terrain, at lower altitudes.