Creating a terrain from contours

I am looking for the best, or maybe quickest, way to produce 3D terrain from a 2D plan with contours, like this:

I can import all the lines satisfactorily into SU. I could easily create a kind of terraced appearance by making surfaces and raising each by a metre at a time, but that won’t represent a realistic impression of the gradations.

Suggestions can include native tools as well as extensions.

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I think I have answered my own question by finding this tutorial: Terrain Modeling in SketchUp with Sandbox Tools - The SketchUp Essentials #31 - YouTube

Looks like Sandbox tools are made for the job.

With Fredo TopoShaper

ter-02

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That’s interesting. The inbuilt sandbox tools work very well but if you start with contour lines in the same plane (as I did), you do have to spend time moving them. The extension seems to speed this up by allowing you to ascribe height data to the lines. Is that the main advantage?

I also think that TopoShaper creates a quadrilateral mesh instead of the heavily triangulated one by the Sandbox from Contours tool. Both have their uses.

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Or you can use Elevate Contours plugin

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Cheers. That certainly speeds things up.

What are the circumstances that would prefer one to the other? Does one make for a smaller file size, for example?

Autostarting at 0:33 (to 1:26)

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Can Vertex Tools or Quadface Tools be used for any of this in place of Sandbox Bonus Tools?

@RTCool, try this to replace a surface of irregular triangles with a quadrilateral mesh

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