Dump the Catmull-Rom's.  Natural Cubic Splines seem to match what is seen in Poser - changing a control point changes the spline globally and the points are on the spline.  Sound familiar?

Problem is that I understand this even less - this is a set of equations to be solved (read: matrix). :)  One difficulty here is that I need a tangent VECTOR (x,y) and all of these splines return a tangent direction (however that is interpreted).  I don't need to determine (and can't use) the interpolated points on the curve, just the tangent vectors to get a close approximation of Poser's curves.

Argggghhhh....

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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