"Arcs" as "path" in parametric morphing? (3d pie chart radial growth)

hi
I’m delving into experimenting with the interactive parametric objects feature in Verge3D.
Making interactive parametric models with Verge3D, Blender, and WebGL

I’m enthusiastic about it’s potential for creativity!
One thing i thought that this may serve as a solution to a challenge we have is making the object grow along a CURVE or “arc” ..RADIALLY instead of a straight line’s path..
i see the objects in demos and the video above be animated strictly on a certain axis or another, but i’d like to have something grow in a CIRCULAR path, if you follow..

it would be as if you took HALF of an outline of an object, (say a chess pawn) and lathed it 360 deg to have a final product of the 3D chess pawn.
another simpler example would be a growing 3D “pie chart” that is animated from one slice.. all the way around to like 270 degrees.
while the outer edge stays smooth along a curved path.

i’d think one solution would be making a cylinder and making it 360 sides around, then derive ONE side’s worth as a pie slice.. 1/360
one edge at 0 one at 1, one in the center of the cylinder’s face (or pie center)
save that as key shape
flatten both outer edges to 0 (so it’s just a line)
save that as a key shape (or base)
then possibly multiply the morph between the flattened and the slice shape morph times 360?? using offset?

but is this method able to be interactive? …

EDIT: just tested and this method as described (so far) .. doesn’t work, as i thought, the vector between the two shapes (flat and pie slice) is a straight line, and as i push the amount of morph on the shape key slider in blender, it just keeps growing in that one 2 (set of vertices coords) vector.
also the max amount is a factor of 10 (in blender, haven’t tried in Verge3D though..) regardless, need to set it to reproduce the effect along a coord, requiring 3 repeatable vector coords (shapes)…hmmm

EDIT: going to investigate the SCREW modifier for modeling radially..

I’m brainstorming here but also wondering if there’s a simpler, more dynamic route I’m unaware of possibly with modifiers/ constraints to an empty’s path or something before i delve into experimenting with it.

thanks!