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<em>v.extrude</em> creates faces, kernels, volumes or 3D lines based
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on 2D vector objects, i.e. points become 3D vertical lines, lines to
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3D lines, boundaries to faces and areas to volumes (composition of
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If the flag <b>-t</b> is used then 3D vector objects follow the
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elevation model by using individual elevation values for the vertices
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and nodes. This can be useful for models of large objects (forest
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<h3>3D houses with fixed height</h3>
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<div class="code"><pre>
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v.extrude input=houses output=houses3D height=5 type=area
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<h3>3D houses with individual height</h3>
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<div class="code"><pre>
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v.extrude input=houses output=houses3D elevation=dem hcolumn=height type=area
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<h3>Convert 2D lines to 3D with fixed height</h3>
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<div class="code"><pre>
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v.extrude input=lines output=lines3D elevation=dem height=0 type=line
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<a href="nviz.html">nviz</a>
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Updated by Martin Landa, FBK-irst, Italy
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<i>Last changed: $Date: 2008-02-29 00:33:29 +0100 (Fri, 29 Feb 2008) $</i>