utils/box_ops3d.py [54:74]:
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   outputList = subjectPolygon
   cp1 = clipPolygon[-1]
 
   for clipVertex in clipPolygon:
      cp2 = clipVertex
      inputList = outputList
      outputList = []
      s = inputList[-1]
 
      for subjectVertex in inputList:
         e = subjectVertex
         if inside(e):
            if not inside(s):
               outputList.append(computeIntersection())
            outputList.append(e)
         elif inside(s):
            outputList.append(computeIntersection())
         s = e
      cp1 = cp2
      if len(outputList) == 0:
          return None
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utils/box_util.py [60:80]:
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    outputList = subjectPolygon
    cp1 = clipPolygon[-1]

    for clipVertex in clipPolygon:
        cp2 = clipVertex
        inputList = outputList
        outputList = []
        s = inputList[-1]

        for subjectVertex in inputList:
            e = subjectVertex
            if inside(e):
                if not inside(s):
                    outputList.append(computeIntersection())
                outputList.append(e)
            elif inside(s):
                outputList.append(computeIntersection())
            s = e
        cp1 = cp2
        if len(outputList) == 0:
            return None
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