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   v.extrude creates 3D faces, kernels or lines based on 2D vector
   objects, i.e. points become 3D vertical lines, lines to 3D lines,
   boundaries to faces and areas to faces and kernel.

   If the flag -t is used then 3D vector objects follow the elevation
   model by using individual elevation values for the vertices and nodes.
   This can be useful for models of large objects (forest stands).

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  3D houses with fixed height

v.extrude input=houses output=houses3D height=5 type=area

  3D houses with individual height

v.extrude input=houses output=houses3D elevation=dem hcolumn=height type=area

  Convert 2D lines to 3D with fixed height

v.extrude input=lines output=lines3D elevation=dem height=0 type=line

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   [1]nviz

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   Jachym Cepicky,
   Updated by Martin Landa, FBK-irst, Italy

   Last changed: $Date: 2008-02-21 08:34:50 -0600 (ЧÑ, 21 Ñев 2008) $

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References

   1. file://localhost/root/tmp/2/fin/nviz.html