Geometry Boost List: Re: [geometry] 3D box -> 3D multi_polygon conversion

Subject: Re: [geometry] 3D box -> 3D multi_polygon conversion
From: Tomislav Maric (tomislav.maric_at_[hidden])
Date: 2013-06-11 15:13:13

Thank you Barend.

I'll dig around and try to see what I need to do to get things running
for 3D. Any suggestions regarding where should I start and what needs to
be done?

Regards,
Tomislav

On 06/11/2013 07:40 PM, Barend Gehrels wrote:
> 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
>
>
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