[vtkusers] vtkPolyDataNormals how to compute points' normal

[donyyo]

Hi Bill,
Could you tell me how to average the cell normals? The average value I got
is different from the value obtained from the following function.
vtkDataArray *pointNormals =
vtkDataArray::SafeDownCast(polyData->GetPointData()->GetNormals());
double pointNormal[3] = {0.0, 0.0, 0.0};
pointNormals->GetTuple(pointId, pointNormal);

BTW, I notice that some people use the weighted average mean in which the
weight is the included angle.
Thank you!



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