Name
ST_3DDifference — Representar diferença 3D
Synopsis
geometry ST_3DDifference(geometry geom1, geometry geom2);
Descrição
Retorna aquela parte de geom1 que não faz parte de geom2.
Disponibilidade: 2.2.0
This method needs SFCGAL backend.
This method implements the SQL/MM specification. SQL-MM IEC 13249-3: 5.1
This function supports 3d and will not drop the z-index.
This function supports Polyhedral surfaces.
This function supports Triangles and Triangulated Irregular Network Surfaces (TIN).
Exemplos
As imagens 3D foram criadas usando o PostGIS xref linkend="ST_AsX3D"/> e interpretadas no HTML usando: X3Dom HTML Javascript rendering library.
SELECT ST_Extrude(ST_Buffer(ST_GeomFromText('POINT(100 90)'),
50, 'quad_segs=2'),0,0,30) AS geom1,
ST_Extrude(ST_Buffer(ST_GeomFromText('POINT(80 80)'),
50, 'quad_segs=1'),0,0,30) AS geom2;
 Geometrias 3D originais cobertas. geom2 é a parte que será removida. |
SELECT ST_3DDifference(geom1,geom2)
FROM ( SELECT ST_Extrude(ST_Buffer(ST_GeomFromText('POINT(100 90)'),
50, 'quad_segs=2'),0,0,30) AS geom1,
ST_Extrude(ST_Buffer(ST_GeomFromText('POINT(80 80)'),
50, 'quad_segs=1'),0,0,30) AS geom2 ) As t;
 O que restou depois de remover geom2 |