Name
ST_ConstrainedDelaunayTriangles — Return a constrained Delaunay triangulation around the given input geometry.
Synopsis
geometry ST_ConstrainedDelaunayTriangles(geometry g1);
Description
Return a Constrained Delaunay triangulation around the vertices of the input geometry. Output is a TIN.
This method needs SFCGAL backend.
Availability: 3.0.0
This function supports 3d and will not drop the z-index.
Examples
 ST_ConstrainedDelaunayTriangles of 2 polygons
select ST_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)
)
);
|