Barend Gehrels dfda1ccbc3 [buffer] fix last cases, in cases where the same offsetted ring is self-intersecting,
the approach using multi_index does not work. We need an extra idenfication
to check the 'sources' of the turns in clusters. Added piece_index for
this purpose.
This can be templated later (so only used for buffer)
2016-03-02 13:09:25 +01:00
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