This topic describes the ST_NumMaterials function. This function returns the number of materials in an sfmesh object.
構文
int4 ST_NumMaterials(sfmesh sfmesh);パラメーター
| 項目 | 説明 |
| sfmesh | The sfmesh object. |
説明
This function returns the number of materials in an sfmesh object.
例
select ST_NumMaterials('{ "meshgeoms" : ["MESHGEOM(PATCH(TRIANGLESTRIP(0 0,0 10,10 10,10 0)))"], "materials":[{"type":"db", "attributes": {"schema":"public","table":"t_material","column":"the_material","key":"num=1"}} ], "primitives" : [ {"meshgeom": 0, "material" : 0}], "nodes" : [ {"primitive" : 0} ] }'::sfmesh);
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