ST_ConstrainedDelaunayTriangles
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## 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)
                       )
    	   );

## See Also

ST_DelaunayTriangles, ST_Tesselate, ST_ConcaveHull, ST_Dump

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