The animation initially illustrates the effect of offsetting spline curves with no trimming capabilities. As the offset distance is increased, self-intersections first arise in the spline offsets and the splines eventually intersect eachother.
The offsetting process is repeated. This time the PGM trims all of the intersections that arise in the spline offsets.
Finally, a fixed line is added to the model and a distance dimension is applied between this line and a spline on the profile. The value of the dimension is modified and the PGM interactively trims the profile as the geometry moves to satisfy the new dimension value.