Name
CG_Buffer3D — Computes a 3D buffer around a geometry.
Synopsis
geometry CG_Buffer3D(geometry geom, float8 radius, integer segments, integer buffer_type);
Description
Generates a 3D buffer around the input geometry geom with a specified radius. The buffer is constructed in 3D space, creating a volumetric representation of the geometry's surroundings. The segments parameter defines the number of segments used to approximate the curved sections of the buffer. The buffer_type specifies the type of buffer to create: 0: Rounded buffer (default) 1: Flat buffer 2: Square buffer
Availability: 3.6.0 - requires SFCGAL >= 2.0.0
Cette méthode nécessite le backend SFCGAL.
Cette fonction prend en charge la 3D et ne supprime pas l'indice z.
Cette fonction prend en charge les surfaces Polyhedral.
Cette fonction prend en charge les triangles et les réseaux irréguliers triangulés (TIN).
Exemples
SELECT ST_AsText(CG_Buffer3D('POINT(0 0 0)', 1, 8, 0));
-- Result: POLYHEDRALSURFACE Z (((0 0 1, 0.5 -0.5 0.71, 0 -0.71 0.71, 0 0 1)), ... )
The following images were rendered pasting the output of the ST_AsX3D query into X3D Viewer.
SELECT string_agg('<Shape
>' || ST_AsX3D(cgbuffer3d_output) || '<Appearance>
<Material diffuseColor="0 0.8 0.2" specularColor="0 1 0"/>
</Appearance>
</Shape
>', '');
segments=32 (rounded buffer)
SELECT CG_Buffer3D(ST_GeomFromText('POINT(100 90)'), 50,32,0);
|
5 segments rounded
SELECT CG_Buffer3D(
ST_GeomFromText('POINT(100 90)'),
50,5,0);
|
32 segments, round
SELECT CG_Buffer3D(
ST_GeomFromText(
'LINESTRING(50 50,150 150,150 50)'
),
10,32,0);
|
32 segments, square
SELECT CG_Buffer3D(
ST_GeomFromText(
'LINESTRING(50 50,150 150,150 50)'
),
10,32,2);
|