Hi Stefan,

Is there any reason why you don't use the Analyze>Two layers>Overlay 
function ?
If you're interested in a new triangulation implementation to build your 
thiessen polygons on, let me know, I've got a delaunay triangulation 
plugin which is quite fast.

Michaël

Stefan Steiniger a écrit :
> Hei,
>
> before I start thinking about and to implement it: Was there already a 
> function to clip geometries (i.e. polygons) using an arbitrary shaped 
> polygon as bounding object? (it is not so difficult though, but I get old ;)
>
> I want to use that to clip the output polys of the thiessen polygon 
> generation
>
> stefan
>
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