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“Generating a realistic surfaces with Terragen and Maya ” by Berthold Grünhagen
Click in the channel box on your plane in the input channel ( Inputs ). We need to set the Subdivisions width and height to a higher rate. We will have a well smoothed terrain. I set it here on 200. You can set it higher, but think about your computer-speed. Forming the terrain will take a few seconds!
Look for the dimensions of the plane. Thats important for fitting the generated maps to the plane. I choose 3.52 (width) x 5.11 (height).

First we texture the plane to see how the dimension-settings work.
Assign a material like lambert to the plane and set the texture as color.
I saved the texture-map before in 3DEM as sthelens.bmp . Now I position it as texture.

Now choose the Sculpt Surfaces Tool in your Polygon shelf.
In the Attribute Editor you can change various parameters. We have to set the Sculpt Parameters on Pull and the Max. Displacement for example to 4 because we have a mountain.
Maya needs to know how we want to sculpt. Choose in Attribute Maps the Import function.
I tested out the possibility to transfer the terrain data in a displacement map. But the described method with planes and sculpting is much easier and you can better texture it.

Then import your in Terragen build b/w-heightmap.