Regarding active scalars

[lassoan (Andras Lasso)]

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Curvature, torsion, tortuosity computation algorithms in VMTK

Hello! I am trying to calculate the geometric indices such as curvature, torsion and tortuosity from the extracted centrelines in 3D slicer by using VMTK extension. Can anyone please tell me what are the mathematical definitions used over here for calculations? Thanks!