[GRASS-user] v.extrude in Grass 6.4.3

[Paul Shapley]

Hi,

I use the 'v.extrude' module often but cannot understand why the resulting
3D geometries criss-cross on the tops and sometimes the sides of the
extrusions. I have tried v.clean in the vector layer but this makes no
difference. I have attached an image so that it can be seen. I have tried
to use the alternative v.to.3d but this does not complete. Can anyone
advise best a use practice.

Thanks,

*Paul J. Shapley *MSc CGeog (GIS) FRGS
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