[postgis-tickets] [PostGIS] #5405: Reexpose SFCGAL ST_3DIntersects and ST_3DDistance perhaps as SC_3DIntersects, SC_3DDistance

[PostGIS]

#5405: Reexpose SFCGAL ST_3DIntersects and ST_3DDistance perhaps as
SC_3DIntersects, SC_3DDistance
--------------------+---------------------------
 Reporter:  robe    |      Owner:  robe
     Type:  defect  |     Status:  new
 Priority:  medium  |  Milestone:  PostGIS 3.5.0
Component:  sfcgal  |    Version:  3.3.x
 Keywords:          |
--------------------+---------------------------
 There were several functions we got rid of when we removed the backend GUC
 in postgis.  These were functions that had the same name in both PostGIS
 proper and SFCGAL, but hte SFCGAL variant would take oever when you did

 set postgis.backend=sfcgal

 From the 3.0 credits here is what we have


 {{{
 ST_3DDistance - Changed: 3.0.0 - SFCGAL version removed Returns the 3D
 cartesian minimum distance (based on spatial ref) between two geometries
 in projected units.

 ST_3DIntersects - Changed: 3.0.0 SFCGAL backend removed, GEOS backend
 supports TINs. Returns TRUE if the Geometries "spatially intersect" in 3D
 - only for points, linestrings, polygons, polyhedral surface (area).

 ST_Intersection - Changed: 3.0.0 does not depend on SFCGAL. (T)Returns a
 geometry that represents the shared portion of geomA and geomB.
 ST_Intersects - Changed: 3.0.0 SFCGAL version removed. Returns TRUE if the
 Geometries/Geography "spatially intersect in 2D" - (share any portion of
 space) and FALSE if they don't (they are Disjoint). For geography
 tolerance is 0.00001 meters (so any points that close are considered to
 intersect)
 }}}

 I don't think there is a need to reexpose ST_Intersection and
 ST_Intersects as I think that was mostly to handle 2D TINS which don't
 have a solid counterpart.

 I think ST_3DDistance and ST_3DIntersects that SFCGAL provided are still
 useful for true surfaces that are solids.

 I don't think we settled on a prefix for these.  I was thinking SC or SG
 or CG.
-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/5405>
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