You might want to turn other layers off for this. The first thing to do is select all of the contour lines at once, being careful to select no geometry that is not elevation information. Step Tw o – Extract Points.Your contour lines should look something like the images at the left hand side. Once this is done you can move on to the next step. Many CAD files already have this done, in which case you are in luck! otherwise be prepared to spend some time moving all your lines to the appropriate height. But they do need to be at the correct vertical elevation or “Z” coordinate. The contour lines do not need to be joined as a single line. Don’t worry too much as long as you can find and isolate the contour lines. Step One – Prepare your Contour Lines. You can import most CAD drawing formats directly into Rhino although some information will be lost. This will allow you to quickly and easily develop a 3D model in Rhino.
Often you will start a project with existing topographical information in the form of contour lines in a CAD program.
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