There is a tutorial here that explains how to make a growing vine effect in 3DStudio Max by animating extruded shapes.  In the tutorial he makes a path for the shape to extrude along as well as keyframe the extrusion over time.  He also applies a twist modifier to the object to make it more random.  I have tried to do the same thing in Carrara 6 Pro but without success.  I make the shapes to extrude in the spline editor and then keyframe the extrusion over time.  The problem is that I can't make the extrusion change direction and twist while it is "growing" or extruding.  If I apply all the deformations to the spine and extrude the object, it just looks like I am scaling it forward, not the "growing" look I want.  Does anyone know of a good way to do this in Carrara?

Thanks for any and all help,
Trevan