[vtkusers] another question!- the order of three arbitrary points

[PAUL]

Hello, everyone, 

As we know, we can get the exact direction of a plane, through the order of
three arbitrary points on the plane, according to the right -hand rule. But
I don't know how to find a way of getting the anticlockwise order of three
arbitrary points when I watch an object from outside.(The three arbitrary
points are on the object.)

Paul 

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