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SFCGAL is a C++ wrapper library around CGAL that provides advanced 2D and 3D spatial functions.
For robustness, geometry coordinates have an exact rational number representation.
Installation instructions for the library can be found on the SFCGAL home page (http://www.sfcgal.org).
To enable the functions use create extension postgis_sfcgal.
SFCGAL Functions
| postgis_sfcgal_version3D
()
Returns the version of SFCGAL in use
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| postgis_sfcgal_full_version1 3D
()
Returns the full version of SFCGAL in use including CGAL and Boost versions
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| ST_3DAreamm 3D
(geom1)
Computes area of 3D surface geometries. Will return 0 for solids.
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| ST_3DConvexHull1 3D
(geom1)
Computes the 3D convex hull of a geometry.
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| ST_3DIntersectionmm 3D
(geom1, geom2)
Perform 3D intersection
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| ST_3DDifferencemm 3D
(geom1, geom2)
Perform 3D difference
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ST_3DUnion1 mm 3D
Perform 3D union.- geom1, geom2
- g1field
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| ST_AlphaShape1
(geom, alpha, allow_holes = false)
Computes an Alpha-shape enclosing a geometry
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| ST_ApproximateMedialAxis3D
(geom)
Compute the approximate medial axis of an areal geometry.
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| ST_ConstrainedDelaunayTriangles3D
(g1)
Return a constrained Delaunay triangulation around the given input geometry.
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| ST_Extrude3D
(geom, x, y, z)
Extrude a surface to a related volume
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| ST_ForceLHR3D
(geom)
Force LHR orientation
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| ST_IsPlanar3D
(geom)
Check if a surface is or not planar
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| ST_IsSolid3D
(geom1)
Test if the geometry is a solid. No validity check is performed.
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| ST_MakeSolid3D
(geom1)
Cast the geometry into a solid. No check is performed. To obtain a valid solid, the input geometry must be a closed Polyhedral Surface or a closed TIN.
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| ST_MinkowskiSum
(geom1, geom2)
Performs Minkowski sum
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| ST_OptimalAlphaShape1
(geom, allow_holes = false, nb_components = 1)
Computes an Alpha-shape enclosing a geometry using an "optimal" alpha value.
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| ST_Orientation3D
(geom)
Determine surface orientation
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| ST_StraightSkeleton3D
(geom)
Compute a straight skeleton from a geometry
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| ST_Tesselate3D
(geom)
Perform surface Tesselation of a polygon or polyhedralsurface and returns as a TIN or collection of TINS
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| ST_Volumemm 3D
(geom1)
Computes the volume of a 3D solid. If applied to surface (even closed) geometries will return 0.
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