Manipulate bend & curvature - Preserve the curvilinear length of the vessel

[hkjeldsberg]

When using the algorithms for manipulating the shape of a bend, or curvature, the curvilinear length of the vessel is also altered. This causes a stretching or compression in the region of interest.

It is desirable to preserve the length of the length of the vessel, a feature yet to be implemented.
Although this feature might restrict some of the alterations performed on the vessel, the patient-specificness of the model is preserved.