If we have a file with face centroid locations, how can we automatically get the nearest vertex?

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Erik Kostson
Erik Kostson Member, Employee Posts: 124
First Answer Name Dropper First Anniversary Ansys Employee
edited May 10 in Structures

Say we have a text file (called: vercentroids.txt) containing centroid locations (x,y,z coordinates) for different faces. We also have a face named selection that appears first on the Named selection tree. How can we automatically get the vertex nearest these centroid locations?

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  • Erik Kostson
    Erik Kostson Member, Employee Posts: 124
    First Answer Name Dropper First Anniversary Ansys Employee
    edited May 10 Answer ✓
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    Below is a sample script showing one way of doing this. In summary it will read in the vercentroids text file, and loop through all faces in the first named selection and their vertices, trying to get the one closest to the centroid. Finally it will create a named selection containing the nearest vertices. As bonus it will create a stress result for each vertex.

    import csv
    cx=[]
    cy=[]
    cz=[]
    myv=[]
    myvIds=[]
    dist=1E12
    with open("D:/vercentroids.txt", 'rb') as f: # change file as needed
        reader = csv.reader(f)
        for row in reader:
            cx.append(row[0])
            cy.append(row[1])
            cz.append(row[2])
    model = ExtAPI.DataModel.Project.Model
    analysis=model.Analyses[0]
    solution=analysis.Solution
    ns=model.NamedSelections.Children[0]
    for j in range(0,len(cx)):
        nId=ns.Location.Ids
        for face in nId:
            f = ExtAPI.DataModel.GeoData.GeoEntityById(face)
            vertices=f.Vertices
            for ver in vertices:
                vsx=ver.X
                vsy=ver.Y
                vsz=ver.Z
                dists=sqrt((float(cx[j])-vsx)**2+(float(cy[j])-vsy)**2+(float(cz[j])-vsz)**2)
                if dists<dist:
                    myvs=(ver)
                    dist=dists
        dist=1E12
        myv.append(myvs)
        myvIds.append(myvs.Id)
    with Transaction():
        for i in range(0,len(myvIds)):
            selection = ExtAPI.SelectionManager.CreateSelectionInfo(SelectionTypeEnum.GeometryEntities)
            selection.Ids=[myvIds[i]]
            newns=ExtAPI.DataModel.Project.Model.AddNamedSelection()
            newns.Location=selection
            r=solution.AddEquivalentStress()
            r.Location=newns
    
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