internal void CreatePolydata(ref vtkPolyData polydata)
{
vtkPoints points = vtkPoints.New();
points.InsertNextPoint(this.origin[0], this.origin[1], this.origin[2]);
float[] x = new float[3];
float[] y = new float[3];
float[] z = new float[3];
Add(this.origin, this.xDirection, ref x);
Add(this.origin, this.yDirection, ref y);
Add(this.origin, this.zDirection, ref z);
points.InsertNextPoint(x[0], x[1], x[2]);
points.InsertNextPoint(y[0], y[1], y[2]);
points.InsertNextPoint(z[0], z[1], z[2]);
polydata.SetPoints(points);
vtkVertexGlyphFilter vertexGlyphFilter = vtkVertexGlyphFilter.New();
#if VTK_MAJOR_VERSION_5
vertexGlyphFilter.AddInput(polydata);
#else
vertexGlyphFilter.AddInputData(polydata);
#endif
vertexGlyphFilter.Update();
polydata.ShallowCopy(vertexGlyphFilter.GetOutput());
}