Recipe for this projection:
- choose n sites (in this case, n = 38 countries with spherical area > .02 steradian)
- compute faces as the geoVoronoi cells of these sites
- compute a minimal spanning tree for these sites (minimizing total distance)
- use d3 geoPolyhedral + clipPolygon magic
Recipe for the tabs:
- use the Delaunay graph to identify cut-away neighbours
Original research by Philippe Rivière for Visionscarto.