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all. I am new to Blender. I have modeled a terrain by joining the edges of different contour lines which I imported from a DXF file. However, I have no idea how to continue creating a small hill on top of a closed polygon or surface. Next, I would like also to know whether there is any tutorial that I could refer to in order to know how to place a road nicely on the terrain surface. Please find the Blender file if needed. Thank you.

enter image description here enter image description here enter link description here

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    $\begingroup$ Hi. Please make the title of the question specific to what you are asking and not just the general topic. Thanks. $\endgroup$ – Ray Mairlot May 23 '20 at 11:04
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The hill

For your small hill, I'd use Loop tools. It's an add-on that comes with your standard Blender.

enter image description here

Select two layers of vertices and Bridge them.

enter image description here

It's wise to subdivide longer edges since Looptools Bridge will not handle them great in this situation.

enter image description here

The road

As for your road, you could use a bunch of modifiers for that. Mainly Shrinkwrap, and a few others that increase the detail of the mesh geometry (more vertices) to help Shrinkwrap work better (give it more vertices to work with).

First something like this: enter image description here

And then move the road above the hill (z-axis only) and press ALT+C and convert it to a mesh. (You could apply a Subdivision modifier first for more mesh geometry) enter image description here

And finally apply Shrinkwrap (and some other modifiers to make it look a little bit nicer) The road is now projected on to the mountain surface from a top down perspective. (Note how the "Mode:" is set to Project.)

enter image description here

The road is shaped a bit funny where there is no mountain underneath it; that might need some manual editing/tweaking I'm afraid.

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Go to EDIT MODE, select two vertices and press F (to create an edge or face). Continue pressing F to generate all the faces (vertices have to be aligned).

STEP 1: enter image description here

STEP 2: enter image description here

probably there is also a better and automated way with extensions. did you look for them?

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