Anything?  I'm not getting great results with Kochanek–Bartels (TCB) splines.  I'ma thinking that there is more to this than considering a keyframe and its previous and next as everyone else does for interpolation (including tangents) since Poser imparts a 'continuous' curve over a continuous set of spline keys.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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