[geos-devel] Buffering with obstacles

[Graham Toal]

You need a variation of the shortest path algorithm; it's basically a
breadth-first flood fill, which is usually implemented by a raster
algorithm, however it *is* possible to come up with something less
expensive (but more complex to code) by using a ray-tracing algorithm (or
more specifically 'shadow casting').  I can't see an easy way to do it
using standard polygon operations though.
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