u/BoombaMike

so obviously you can see the problem here... the grass is sticking up through the road. I have the grass growing using a matrix scatter object using the ground plane, and I would love to be able to somehow add a shader(? maybe) or something that uses the geometry from my road to either tell the matrix object to not add particles there, or at least set their scale to zero. Not sure if either way helps with render times. Since I would like to be able to change the road's path I'm hoping that would still be possible. The road is just a rectangle swept along a path. I tried using a selection tag but it came out blocky along the edges of the road since the ground plane is a grid.

Thanks for any help! I feel I'm getting closer.

Odds are I've set up my road in a ham-fisted way, but here's what I did, and here's what I'd like to fix.

I made my road by sweeping a 2 cm tall rectangle along a path.

I then made my gravel edges the same way, but with a wider rectangle at 1cm on the same path to create the gravel shoulder.

What I would love to do is roughen up the outer edge of my gravel so that it blends slightly more organically into the grass areas. Any ideas? Thanks!