Hi AL2000,

The centers of the flat torus are available. Their conformal mapping should be the center of the mapped hexagons. (?)
To form vector, the start point is a corresponding point on the Rcircle, which is the center of the rcircle through the corresponding center point of the hexagon.
Each of such start point can also be calculated from u and v. (?).

This should be fairly easy to code in the .js. I'll try...

- Brian