[postgis-devel] ST_Buffer in 3D supporting Z
Olivier Courtin
olivier.courtin at oslandia.com
Fri May 4 01:59:46 PDT 2012
On May 3, 2012, at 5:31 PM, Sam Hariton wrote:
Hi Sam,
> Is the Paris Sprint likely to result in a decision about GEOS/Boost/CGAL/PostGIS core/etc.?
> Or is it a longer term discussion than that?
Well PostGIS (quite) always worked with GEOS, and we have good
reasons to believe that it will continue for a while.
But maybe some new features (or better performances ?) could be
also provide by others additional libs.
At this stage there's no strong opinion on what we have/want to do.
Paris place could be a way to exchange point of views and/or
to process experimentations, and maybe prepare later PSC decisions.
(and as Regina said nothing will be set in stone in Paris)
> In the meantime, looking through the ticket list, there's a couple
> tickets (#430 and #428) that look interesting and I'd like to make
> a stab at. What's the proper etiquette for doing so?
For 430
- For these one there's mainly ST_AsCollada missing, as
GeomFromGML, ST_AGML, and ST_AsX3D are already
implemented.
An example could be used as a template is lwout_wkt.c
But if we want to implement it for the whole use cases, theres several
others issues:
Texture handling will be an issue to think about.
Max number of triangles handled by Collada, too (~21845)
so surely a simplification algorithm could be a day a need too ?
(a bit as ST_Simplify but for 3D)
Ability to triangulate to switch from PolyhedralSurface to Tin also.
And last be not least Z altitude could be relative to ground or
geocentric.
For 428
- These one is also a bit more tricky. It could be a good idea to
explore, if CGAL provide some primitive to handle it rightly.
(dunno right now)
On theses topic any help is very welcome !
:)
--
Olivier Courtin
Oslandia
+33 977 217 501
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