rsNonLinearShapes
Autodesk Softimage Tool
Here: http://rigstudio.com/rsnonlinearshape/
The shape animation produces a linear interpolation.
With this tool you can create non linear shapes.
This tool creates an ICE tree to manage the shape information. It is possible to add several non linear shapes to the same object.
This tool is inspired on a procedure of Paul smith(Arrays / Bezier Shape sequence - vimeo.com/19248430).