How to subtract roads from terrain?

corintho

Hello! I have terrain created using height map (rendered with z-depth channel in 3ds Max).

I also have roads and streets created with standard tools (import DXF and polygonal street tool).

All streets aligned to terrain.

Now I need to create a hole in the terrain under the streets and lots.

I will place scatters on the terrain in 3ds Max. So roads must be subtracted from the terrain.

How to do this?

desert

Here are two ways you can approach this: duplicate the road layer, set its y-value to 0, select it, and use the 'align terrain to shape' tool to lower the terrain in the copied road's area; or, modify the heightmap data in 3D Max, noting that heightmaps use square cells, which can cause uneven terrain near the road depending on the cell size.