Get centroid of 2 semicircular end cap faces on cylinders?

Erik Kostson
Erik Kostson Member, Moderator, Employee Posts: 282
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edited July 2024 in Structures

Say we have 2 semi-circular faces as end caps on a cylinder (see image below). We would like to extract the centre point (see red dot at the centre of the face shown below) and not the centroid of the individual faces (see 2 red crosses on the 2 faces shown below. How can this be done by scripting?

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  • Erik Kostson
    Erik Kostson Member, Moderator, Employee Posts: 282
    50 Answers 100 Comments Second Anniversary 25 Likes
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    Answer ✓

    Below is a sample code to be tailored and used as needed, showing one possible way of doing this:

    def compare(a,b):
    global aedges
    global bedges
    aedges=a.Edges
    bedges=b.Edges
    if a.SurfaceType==GeoSurfaceTypeEnum.GeoSurfacePlane and b.SurfaceType==GeoSurfaceTypeEnum.GeoSurfacePlane:
        for ii in range(len(aedges)):
            for jj in range(len(bedges)):
                if aedges.Count==bedges.Count==2 and aedges[ii].Length==bedges[jj].Length and aedges[ii].Id==bedges[jj].Id:
                    print('found edge/ length : ' + str(aedges[ii].Length) + 'Centre : ' + str(aedges[ii].Centroid))
                    return aedges[ii].Length
                    break
bodies =  ExtAPI.DataModel.Project.Model.GetChildren(DataModelObjectCategory.Body,True)
for body in bodies:
    print(body.Name)
    gbody = body.GetGeoBody()
    faces=gbody.Faces
    for i in range(len(faces)):
        for j in range(i + 1, len(faces)):
            compare(faces[i], faces[j])

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