Combining Two Terrains

I chose the following method:

  • create a duplicate of terrain, select all faces > delete (using Selection Toys extension);

  • the remaining edges are the roads and border edges. I made them 2D (with Vertex Tools);

  • I then erased all the lines that were the border edges of those separate plots of terrain;

  • with Sandbox Tools > From Scratch I created a 2D surface slightly larger than the initial terrain.

  • with the MCAlignEnds extension I draped the surface (from Sandbox) on the existing 3D terrain (the one consisting of several separate plots);
    :bangbang: It is best if you drape border edges before using AlignEnds.

  • the result was the new terrain made from a single surface;

  • having in separate groups the perimeter (border edges) of the original 2D terrain, the 2D roads and the new 3D terrain;

  • drape one by one border edges group, then roads group and you will have the clean new terrain in one piece (surface) with the roads.
    :bangbang: It is best if you drape border edges before using AlignEnds.

I also tested before and even if it is possible, the method with Vertex Tools involves much more work.

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