CG_ConstrainedDelaunayTriangles
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Name

CG_ConstrainedDelaunayTriangles — Return a constrained Delaunay triangulation around the given input geometry.

Synopsis

geometry CG_ConstrainedDelaunayTriangles(geometry g1);

Descrizione

Return a Constrained Delaunay triangulation around the vertices of the input geometry. Output is a TIN.

Questo metodo richiede il backend SFCGAL.

Disponibilità: dalla versione 1.5.

Questa funzione supporta il 3d e non distrugge gli z-index.

Esempi

CG_ConstrainedDelaunayTriangles of 2 polygons

select CG_ConstrainedDelaunayTriangles(
                                        ST_Union(
                                        'POLYGON((175 150, 20 40, 50 60, 125 100, 175 150))'::geometry,
                                        ST_Buffer('POINT(110 170)'::geometry, 20)
                                        )
                                        );

ST_DelaunayTriangles of 2 polygons. Triangle edges cross polygon boundaries.

select ST_DelaunayTriangles(
                                        ST_Union(
                                        'POLYGON((175 150, 20 40, 50 60, 125 100, 175 150))'::geometry,
                                        ST_Buffer('POINT(110 170)'::geometry, 20)
                                        )
                                        );