How to project spline mesh to landscape with RVT?

I’ve got some RVT roads that aren’t working well. Currently, I have them setup as you would rocks and boulders, where the mesh takes from the landscape. In the pics, you can see it’s not working too well because it’s completely hidden on slopes and only works on flat ground.

I’d like to have my road spline project itself onto the landscape, but I don’t know how to do that and basically all RVT tutorials are doing the opposite.

Flat vs sloped ground


The portion of my landscape mat that handles RVT

Road master material




Here’s the master zoomed out (minus some stuff on the left)

Material instance.

Any luck with it?