Subject: Re: [geometry] 3D box -> 3D multi_polygon conversion
From: Barend Gehrels (barend_at_[hidden])
Date: 2013-06-11 13:40:25
Hi Tomislav,
On 11-6-2013 12:10, Tomislav Maric wrote:
> Hi everyone,
>
> I need some help with the convert algorithm.
>
> In the online documentation for the convert algorithm
>
> http://www.boost.org/doc/libs/1_54_0_beta1/libs/geometry/doc/html/geometry/reference/algorithms/convert.html
>
> it is stated that
>
> "...a box can be converted to a ring, polygon or multi-polygon, but not
> vice versa."
OK so that statement is not complete, because a 2D
ring/polygon/multi-polygon is expected. I will adapt it.
>
> However, when I try to use the convert algorithm for a 3D box, it fails
> with the "not implemented" assertion.
So no, that does not work alas...
Our rings/polygons are 2D but they can have a third dimension (height).
However that third dimension is more a kind of offset-from-zero-level,
and not used for almost all algorithms up to now. So if you do an
intersection, that is done in 2D effectively.
Regards, Barend