Spline Control

While working on a small fun project that involved animating splines (Montpellier Tramway Map morph), the limitations of Spline IK and general hostility of spline animation forced me to create my own simple animation-friendly spline control. The advantages over SplineIK are that you can easily control the tangent handles as they have separate controls and at the same time follow the transforms of the knot control (scaling the knot control will scale down the handles as well), and the helpers are oriented along the spline, making precise alignment to target orientation easier (and also make it possible to use Parent coordsys to manipulate the handles).