This topic describes the ST_3DRemoveDuplicateVertex function. This function welds vertices of the sfmesh or IndexSurface object whose coordinate distance is within the specified threshold (texture coordinate difference is also within the threshold) and removes duplicate vertices.
Syntax
sfmesh ST_3DRemoveDuplicateVertex(sfmesh sfmesh, float8 dist_threshold);Return values
The welded sfmesh object is returned.
Parameters
Parameter | Description |
sfmesh | The sfmesh model object. |
dist_threshold | The distance threshold. |
Description
This function welds vertices of the sfmesh or IndexSurface object whose coordinate distance and texture coordinate difference are within the specified threshold. Cartesian coordinate system is used in the distance calculation.
Sketch maps
Raw data (50.2 MB)
Vertex-welded results (20.2 MB): dist_threshold = 0.01
Vertex-welded results (3.3 MB): dist_threshold = 0.1
Vertex-welded results (0.63MB): dist_threshold = 1 (some details lost)
Examples
SELECT ST_AsText(ST_3DRemoveDuplicateVertex('MESHGEOM(PATCH(INDEXSURFACE(VERTEX(0 0 0, 1 0 0, 0 1 0, 1 0.01 0, 0.01 0 0, 0 -1 0), INDEX((0,1,2),(3,4,5)))))'::meshgeom, 0.1));
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{"version" : 1, "root" : 0, "meshgeoms" : ["MESHGEOM(PATCH(INDEXSURFACE Z (VERTEX(0 0 0,1 0 0,0 1 0,0 -1 0),INDEX((0,1,2),(1,0,3)))))"], "primitives" : [{"meshgeom" : 0}], "nodes" : [{"primitive" : 0}]}