polyline creation : join_elements does not return the resulting element

[usai-sylvain]

I am trying to create a polyline by joining some lines :

    points = [cadwork.point_3d(0,0,0), cadwork.point_3d(100,0,0), cadwork.point_3d(0,100,0), cadwork.point_3d(100,100,0)]
    polyline_segments = []
    
    for i, point in enumerate(points):
        ec.create_node(point)
        if i < len(points) - 1:
            line = ec.create_line_points(points[i], points[(i+1)%len(points)])
            polyline_segments.append(line)
    results = ec.join_elements(polyline_segments)
    print("polyline_segments: ", polyline_segments)
    print("results: ", results)
    return

result :

[65329958, 65329956, 65329954]
None

The result does look like a polyline in the model (selecting one segment selects the other segments too, length is the length of the full polyline, "Active Lines : 3") but I still get individidual ids when I print get_active_identifiable_element_ids :

    all_element_ids = ec.get_active_identifiable_element_ids()
    for i, element_id in enumerate(all_element_ids):
        print(f"element_id: {element_id}, index: {i}")
    return

result :

element_id: 65329958, index: 0
element_id: 65329956, index: 1
element_id: 65329954, index: 2

Is there a better way to approach this ? or should I always expect to deal with the sub element ids ?

[Brunner246]

@usai-sylvain this is not a join as you might think, it does just group the elements.
You could try to use solder_elements to unify them lines.

[usai-sylvain]

amazing 😍 solder seems to work : solder_elements (even though it returns nothing)

    points = [cadwork.point_3d(0,0,0), cadwork.point_3d(100,0,0), cadwork.point_3d(0,100,0), cadwork.point_3d(100,100,0)]
    polyline_segments = []
    
    for i, point in enumerate(points):
        ec.create_node(point)
        if i < len(points) - 1:
            line = ec.create_line_points(points[i], points[(i+1)%len(points)])
            polyline_segments.append(line)
    results = ec.solder_elements(polyline_segments)
    print("polyline_segments: ", polyline_segments)
    print("results: ", results)
    return

start soldering (3) elements

- splitting the incoming elements to volumes and surfaces and remove the unsolderables

- getting the first surface/volume

Tried to set null body in function: "CCdwkElementData::setAkgBody"
- preparing result...

- finished soldering

polyline_segments:  [65335553, 65335549, 65335547]
results:  []