[GRASS-user] Extrusion of vectors based on attribute results to vectors with zero height

[niktzel]

I'm dealing with problems trying to extrude some buildings in Grass and
present them with NViz, by taking the height as stored in an attribute of
the vectors.
The resulted 3d vectors do take the elevation value from the surface (trace
is also used) but they don't get the height from the attribute.. Somehow the
attribute value taken as height during the extrusion is ignored..
On the contrary, the extrusion based on a fixed height works just fine with
the same data..
GRASS is used via the QGIS 1.8 environment on a Windows 7 platform.
Images of the results are following:
<http://osgeo-org.1560.n6.nabble.com/file/n5043483/extrude.jpg> 



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