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I'm not sure I understand your question, but perhaps by "reference  
point" you mean the origin of the coordinate system.

Quoting "Simao Soares" 
<>:

> Hello,
>
> I would like to know how is calculated the center of a polygon in the
> minkowski sums function from cgal. This function use the center of the
> polygon as the reference point, but I don't know if this center is a simple
> center of the bounding box of the polygon or a mass center.
>
> Thanks in advance,
>
> --
> Simão Soares
> LinkedIn: http://www.linkedin.com/in/simaosoares
> Phone: +351 918 656 143
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