Hello,
i have created a DGM (triangle mesh) by the elevation points (shown in black) then i have created the roads (shown in white) flat as 3D surfaces and i want to merge these into the DGM so that they have the same elevation and relief as my terrain but i don't find these functions
I also converted the DGM into a 3D element to try if it was easier to fit a 3D surface to this new 3D element.

I am very much looking forward to your help.

Best,

Carmen