Get vertices coordinates on an edge - Forum Open Cascade Technology

Jorge Fernandes
Mon, 06/19/2023 - 13:31

Forums:

I have this function:

    shape = read_step_file(input_path)
    t = TopologyExplorer(shape)

    edges = []
    for edge_idx, edge in enumerate(t.edges()):
        d = {'edge': edge,
             'edge_index': edge_idx,
             'vertices_coordinates': []}
        vertices = t.vertices_from_edge(edge)
        for i, vertice in enumerate(vertices):
            c = vertice.DumpJsonToString()
            c = '{' + c + '}'
            data = json.loads(c)
            point = data["TShape"]["Pnt"]['gp_Pnt']
            d['vertices_coordinates'].append(point)
        edges.append(d)

    return edges

But this code doesn't give me the global coordinates, only the local ones.

I draw the edges and the shape, and they don't match.
The result is in the attachment.

How to get the global?

Attachments:

1.png

Jorge Fernandes
Mon, 06/19/2023 - 13:33

The result I want is this:

Attachments:

2.png

Daiva Daiva
Wed, 07/05/2023 - 16:35

Hi Jorge,

I'm not sure about local and global, but this is how i get vertex coordinates of an edge:

from OCC.Extend.TopologyUtils import TopologyExplorer
from OCC.Core.BRep import BRep_Tool
for vertex in TopologyExplorer(edge, ignore_orientation=True).vertices():
    point = BRep_Tool().Pnt(vertex)
    coordinates = [point.X(), point.Y(), point.Z()]