On Mon, Aug 13, 2012 at 10:38 AM, Niels Charlier <ni...@scitus.be> wrote:
>
>> The method in ReferencedEnvelope3D uses the 2D transforming method, only
> looking at the first 2 dimensions, and getting a 2D envelope back, but then
> just restores the third coordinate so it stays the same and actually does
> return a 3D envelope.
> Proper 3D transformations is one of the challenges we face with the 3d
> integration.
Ah ok, I did miss this part.
>
>
> Makes sense, but makes me wonder at the same time, what happens if you
>> return a 3D geometry instead? I guess you had something break?
>>
> The problem is to make a proper geometry of a bounding box, you will need
> a three dimensional polygonal surface, to represent a cube. If I understand
> correctly, there is no support for this kind of geometries in geotools atm
> and it is basically a whole new JTS that needs to be written for this kind
> of support.
> At the same time, I think there might be other, more efficient ways to
> translate the 3D bbox query to sql.
>
>
Hum.. yeah, correct, one might try with a multipolygon with 2.5D faces but
indeed it would not be the same thing, good point.
>
> In general, given your experience with your proposal, what would you say
>> are the
>> missing bits/steps to work on (outside of this proposal) to make 3D data
>> and queries
>> really work?
>>
>> Well, the vividsolutions JTS library does support a third coordinate but
> in practice it only has support for 2D complex structures and algorithms.
> This is the biggest problem. I think to make 3d fully operational, I think
> we almost need to rewrite the whole JTS library.
>
Hmm... science fiction?
All right, I'm good with the patches. I see Jody wanted to talk more though.
Cheers
Andrea
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