You need to make sure you have installed the pointset reconstruciton tools from the Rhino Labs and that you have your CAD topography map with all it’s topograpy lines placed at their correct elevation heights

Begin by entering the Delaunay (from the pointsetreconstruction tools) command.

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Rhino will then ask you to select vertices for delaunay triangulation. You will then need to chose all you topography lines.You can leave the sample interval size at its default which is one

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Once the triangulation reaches 100% you can then right click on your mouse to complete the command. You will then be able to see that you have created a very colorful triangulated surface – which is not workable at all

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This step requires you to switch to top view (will not work in other views). Once in top view you can enter the Drape command. Create a crossing window over the triangulated surface to define the area to drape. Leave all the drape options set to their defaults.

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Once the command is complete you can delete the colored triangulated surface. This will give you a very cool looking topo that you can now use.

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This model is sometime a little difficult to work with – only because of its high amout of control points that are used to give the topo a higher precision finish form.

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(The image that follows shows the high amount of control points used to create this topo)

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What I would do next is reduce the amount of control points by Using theRebuild Command. Which will pop up the rebuild Surface control Panel

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Within the control panel you will be able to see how many control points your surface currently has by looking at the point count. You can then reduce to a smaller amount of points. You can currently see that I have chosen to reduce to the amount of 50 (U) and 50 (V) point counts. Which gives a lower precision model -but a much easier model to work with and modify.

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That concludes this tutorial on how to create 3D topos

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Some people chose to use the RhinoTerrain plugin which works the same way as the pointset reconstruction tools plugin. Instead of using the delaunay comand you use the Rhinoterrain version which is RTdelaunay. You then follow all the same steps shown here (TWO & THREE) to create a workable 3d Terrain.


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