[rounce]

A curve in a parametric CAD program will have an internal representation which is perfectly smooth. As rather than being than a set of straight lines (edges) connected by vertices it is instead a mathematical description of a curve which has infinite resolution.

For your animation example Blender would be the appropriate tool to use as you are doing stuff that requires flexibility of form rather than precision.

[amelius]

Aha, so it is a bit like bitmap versus vector graphics in 2d painting programs.

[rounce]

Yeah somewhat, there’s also the thing where mesh models can potentially have no thickness (eg. a single polygon) as well as gaps in the mesh whereas this is (usually) impossible in the case of a parametric model.