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COMMENT ON FUNCTION postgis_sfcgal_version() IS 'Returns the version of SFCGAL in use';
COMMENT ON FUNCTION postgis_sfcgal_full_version() IS 'Returns the full version of SFCGAL in use including CGAL and Boost versions';
COMMENT ON FUNCTION ST_3DArea(geometry) IS 'args: geom1 - Computes area of 3D surface geometries. Will return 0 for solids.';
COMMENT ON FUNCTION ST_3DConvexHull(geometry) IS 'args: geom1 - Computes the 3D convex hull of a geometry.';
COMMENT ON FUNCTION ST_3DIntersection(geometry, geometry) IS 'args: geom1, geom2 - Perform 3D intersection';
COMMENT ON FUNCTION ST_3DDifference(geometry, geometry) IS 'args: geom1, geom2 - Perform 3D difference';
COMMENT ON FUNCTION ST_3DUnion(geometry, geometry) IS 'args: geom1, geom2 - Perform 3D union.';
COMMENT ON AGGREGATE ST_3DUnion(geometry) IS 'args: g1field - Perform 3D union.';
COMMENT ON FUNCTION ST_AlphaShape(geometry, float , boolean ) IS 'args: geom, alpha, allow_holes = false - Computes a possible concave geometry using the CGAL Alpha Shapes algorithm.';
COMMENT ON FUNCTION ST_ApproximateMedialAxis(geometry) IS 'args: geom - Compute the approximate medial axis of an areal geometry.';
COMMENT ON FUNCTION ST_ConstrainedDelaunayTriangles(geometry ) IS 'args: g1 - Return a constrained Delaunay triangulation around the given input geometry.';
COMMENT ON FUNCTION ST_Extrude(geometry, float, float, float) IS 'args: geom, x, y, z - Extrude a surface to a related volume';
COMMENT ON FUNCTION ST_ForceLHR(geometry) IS 'args: geom - Force LHR orientation';
COMMENT ON FUNCTION ST_IsPlanar(geometry) IS 'args: geom - Check if a surface is or not planar';
COMMENT ON FUNCTION ST_IsSolid(geometry) IS 'args: geom1 - Test if the geometry is a solid. No validity check is performed.';
COMMENT ON FUNCTION ST_MakeSolid(geometry) IS 'args: 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.';
COMMENT ON FUNCTION ST_MinkowskiSum(geometry, geometry) IS 'args: geom1, geom2 - Performs Minkowski sum';
COMMENT ON FUNCTION ST_OptimalAlphaShape(geometry, boolean , integer ) IS 'args: param_geom, allow_holes = false, nb_components - Computes a possible concave geometry using the CGAL Alpha Shapes algorithm after have computed the "optimal" alpha value.';
COMMENT ON FUNCTION ST_Orientation(geometry) IS 'args: geom - Determine surface orientation';
COMMENT ON FUNCTION ST_StraightSkeleton(geometry) IS 'args: geom - Compute a straight skeleton from a geometry';
COMMENT ON FUNCTION ST_Tesselate(geometry) IS 'args: geom - Perform surface Tesselation of a polygon or polyhedralsurface and returns as a TIN or collection of TINS';
COMMENT ON FUNCTION ST_Volume(geometry) IS 'args: geom1 - Computes the volume of a 3D solid. If applied to surface (even closed) geometries will return 0.';
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