Re: How to model a growing root?

First, make sure you have History on.

When you open the 'Extrude' options panel, make sure to choose 'partial' curve range, and set the 'Scale' attribute to zero. This combination of options should give you the results you need.

By animating the 'End Position' attribute of the path curve, you can control how far along the path the root tip grows. This tip will be a sharp point because of the extrude 'Scale' being zero.

Note that, by animating the scale of the circle at the same time, you can make the whole root gain thickness over its growth process.

-Steve