red line has tcb (tension, continuity and bias) parameters set constant for
whole spline while black spline has the same control points with different tcb
parameters for incoming and outgoing tangent vectors. additional control points
before and after spline required to control first and last segment.
ABX
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![tcb_spline.png](/povray.binaries.images/attachment/%3Cltad9voejvpq5fc1j1i0h5fq73t0l3a48t%404ax.com%3E/tcb_spline.png?preview=1)
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