ST_AsWKT-PolarDB(PolarDB)-阿里云帮助中心

Returns the well-known text (WKT) representation of a meshgeom or sfmesh object.

Syntax

text ST_AsWKT(meshgeom geom);
text ST_AsWKT(sfmesh sfmeshObject);

Parameters

Parameter	Type	Description
`geom`	meshgeom	The meshgeom object to convert.
`sfmeshObject`	sfmesh	The sfmesh object to convert.

Examples

Convert an sfmesh object from JSON input

SELECT ST_AsWKT(ST_MeshFromText('{"version" : 1, "root" : 0, "meshgeoms" : ["MESHGEOM(PATCH(INDEXSURFACE Z (VERTEX(0 0 2,0 10 3,10 10 1,10 0 1),INDEX((0,1,2),(1,2,3)))))"], "primitives" : [{"meshgeom" : 0}], "nodes" : [{"primitive" : 0}]}'));

Output:

{"version" : 1, "root" : 0, "meshgeoms" : ["MESHGEOM(PATCH(INDEXSURFACE Z (VERTEX(0 0 2,0 10 3,10 10 1,10 0 1),INDEX((0,1,2),(1,2,3)))))"], "primitives" : [{"meshgeom" : 0}], "nodes" : [{"primitive" : 0}]}

Convert a meshgeom object from WKT input

SELECT ST_AsWKT(ST_MeshGeomFromText('MESHGEOM(PATCH(INDEXSURFACE(VERTEX(0 0 2,0 10 3,10 10 1,10 0 1),INDEX((0,1,2),(1,2,3)))))'));

Output:

MESHGEOM(PATCH(INDEXSURFACE Z (VERTEX(0 0 2,0 10 3,10 10 1,10 0 1),INDEX((0,1,2),(1,2,3)))))