hi, I made couple of road models which is just a flat model with couple of vertices, like this.


How do I flat it on the terrain surface without just like it's a part of the terrain. I know I have to look for the terrain normal for this but it confuses me on how to implement it. Setting it's orientation to terrain surface is not enough since the road model with usually intersect multiple terrain surface and it will look funny if a part of the road is not connected to the surface.

And also is the a way to enable keep both normal map and detailed texture for the terrain. When set my terrain to use normal map to for terrain shadow it ignores the detail map resulting a bad terrain detail up close.