Carlos Furuti’s cubic globe #3 - http://www.progonos.com/furuti/MapProj/Normal/ProjPoly/projPoly2.html
Research for d3-geo-projection/pull/86 and d3-geo/issues/46.
Re-incorporating Jason Davies’ clipPolygon() code into d3v4.
Code base at Fil/d3-geo:clip-polygon.
See also https://bl.ocks.org/Fil/694ba0d0bc1fc4c24eb257dc210eb01a