Exporting the 3D model, drawing the contour lines will be our goal. First we remove the trees and buildings from the original 3D.
Filling holes, removing trees and buildings creates holes. It can be filled with Metashape.
Retexturing, recreates a nice texture over the filled parts.
Post-processing in Rhino-Grasshopper
We will show how to draw contour-line very easily with Grasshopper.
Import the mesh.
Then, Mesh to Quad mesh to SubD , Fill holes in SubD and finally QuadMesh
Create a vertical line
Divide the line into distances with a Slider, so that it can be changed
Create planes from the divided line
Intersect with the Mesh
You get your contour lines
By changing the number of planes, you get more presision
This is every 20cm
Will add colors depending to Heights. (Click on the image for a readable view).
It gives this nice result