v.extrude creates faces, kernels, volumes or 3D lines based on 2D vector objects, i.e. points become 3D vertical lines, lines to 3D lines, boundaries to faces and areas to volumes (composition of 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).
v.extrude input=houses output=houses3D height=5 type=area
v.extrude input=houses output=houses3D elevation=dem hcolumn=height type=area
v.extrude input=lines output=lines3D elevation=dem height=0 type=line
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