Hi, there are many ways of animating vines or strokes -seen a couple of questions these days- and here’s yet another one
Since rotobezier is around I’ve been thinking in animating the radius to fade a curve ‘visibility’, this script does that by keyframing each point, it works with bezier and nurbs -beziers seems to work better- and you can even feed it with a mesh or a text and it will do the conversion.
You should setup start frame and length, plus a fade time if you want the curve to disappear.
It is advisable to subdivide the curve if you want to give extra detail to the animation.
Options like bevel depth and resolution can be adjusted later.
the updated script: http://dl.dropbox.com/u/16486113/Blender/radius_grow.py
a little video: http://dl.dropbox.com/u/16486113/Blender/torus_grow.mp4