Draping algorithm for procedural road generation

[davvv]

@Synnoid;683075

Hey, Davvv, you emailed me but I am going to answer here so other people can benefit.
The way I achieved that effect in the Terra Nova project is quite straightforward.
First I quickly checked which tiles had a road in them (by using points on the spline and a simple rectangle/circle intersection formula.
After I had all the tiles, I looped through the vertices on that tile and used their distance from the road spline to figure out of they were near the road.
After that, I used a simple fall off formula to create the curved banks you see in my project.
In your case, you might want to tesselate the chunks around the road a bit more, or it will be super tricky to create proper non-intersecting Geo.
Hope that helps, if you have any more questions, let me know.

Hey! Thanks a lot for your reply. I was running into some issues regarding getting bank vertices, but I resolved it last night (vertices on mesh section edges were an edge case I didn’t account for), so now I (at least) have a subset of the verticies of a “road hull”.

I like your solution, but, unfortunately, I can’t tesselate my terrain mesh further as it would degrade FPS. I think my only recourse is triangulating the road hull (Delaunay Triangulation comes to mind), but I was hoping to avoid that kind of complexity. Does anyone know if UE4 supports triangulation out of the box?