[postgis-tickets] [PostGIS] #1898: ST_DelaunayTriangles option to output as TIN

[PostGIS]

#1898: ST_DelaunayTriangles option to output as TIN
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 Reporter:  robe         |       Owner:  nw            
     Type:  enhancement  |      Status:  assigned      
 Priority:  high         |   Milestone:  PostGIS Future
Component:  postgis      |     Version:  trunk         
 Keywords:               |  
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Comment(by robe):

 It's built on CGAL so has a lot of the goodness for 3D handling that CGAL
 has but sounds like it might be a pain to compile.  Olivier is supposed to
 change the configure to allow this optional configure.  Then all the
 SFCGAL functions will be provided as a separate extension similar to what
 is done with postgis_topology.

 https://github.com/Oslandia/SFCGAL

 I'm  okay with ST_DelaunayTriangles returning TIN as long as its not the
 default behavior and there is an option to get polygons if you want (so
 that means that flag has to be tri-state not 2 state). The reason being
 things like ST_Union and friends don't like the extended types and
 extended type behavior might change in future.  So then TIN would only be
 useful for viewing with tin supporting outputs or manipulating with
 external tools. (which is not bad but not great).

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/1898#comment:7>
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