Merge 2 closed curve using boolean union didn't work

Rhino Developer
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1

I am trying to merge two curves as one using BooleanUnion function in rhino common.

Curve.CreateBooleanUnion(Curves, doc.ModelAbsoluteTolerance);

It works for most scenarios, but for some reasons its not working for some curves.

image
image1828×744 20.9 KB

1 Like
2

Hi!

Control that both curves are in the same plane and intersecting each other. Otherwise, can you share a 3d file with the curves that are not working? :relaxed:

3

curve.3dm (33.0 KB)
sample file

4

added sample file in the thread

5

Hi @hariprazath,

This simple Python script seems to work on the curve in your sample file.

import Rhino
import scriptcontext as sc

def test_curve_booolean_union():
    filter = Rhino.DocObjects.ObjectType.Curve
    rc, objrefs = Rhino.Input.RhinoGet.GetMultipleObjects("Select curves", False, filter)
    if rc != Rhino.Commands.Result.Success: 
        return
    if not objrefs:
        return
        
    in_curves = []
    for objref in objrefs:
        curve = objref.Curve()
        if curve:
            in_curves.append(curve)
            
    if len(in_curves) < 2:
        return
        
    tolerance = sc.doc.ModelAbsoluteTolerance
    out_curves = Rhino.Geometry.Curve.CreateBooleanUnion(in_curves, tolerance)
    if out_curves:
        for curve in out_curves:
            id = sc.doc.Objects.AddCurve(curve)
            rh_obj = sc.doc.Objects.Find(id)
            if rh_obj:
                rh_obj.Select(True)
    
    sc.doc.Views.Redraw()

if( __name__ == "__main__" ):
    test_curve_booolean_union()

What are we missing?

– Dale