Reading the v4 beta release notes:

10/10/2019, face.evaluateNormal(uv).
The normal is a vector.

1/22/2020, face.dropPoint(pt), yields 2D uv of surface point, closest to input pt.
So pt just has to be close to surface, or could be a point on an isoline.

I figure that a point (say the center point of a circle), could be acted on by a force, either attractive or repulsive, move to pt2, and a new point on surface found, with new circle aligned to new surface normal. What is the time overhead?

- Brian