Video - V-Ray Fur for grass
I tried to figure out how to approach creation of 3D grass using V-Ray Fur in V-Ray 3 for Rhino. Normally, I would use scattered 3D realistic grass from here, but for some specific areas ( such as thin lines in between pavers ), scattered grass would just not cut it. This is a place where V-Ray fur plays at it's best. Long story short, check out the video.
When creating Fur, always lower your Density from (default) 5 to 0.1 - it's a good starting point. Using this as a first and quick preview, you can start with topping up the value up to the point where you are satisfied with the density.