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From Odwiki

Back to the beginning: TerragenSOP

Define the problem (what do we want this SOP to do?)

Truly, this is a very simple SOP and a good example of a simple, "getting started" HDK project:

• Read a Terragen terrain file, create either a mesh or NURBS surface from the data. Add an offset and scale the geometry as determined from user controls (this could always be done by appending a Transform SOP, but we'll include it for this tutorial). If the terrain is "draped", apply correct curvature to the surface.

• Export Houdini geometry to Terragen for further editing (and then the modified geometry is reimported back into Houdini).