code: function (coord, param, ringAndEdgeIn, ringAndEdgeOut, nxtIsectAlongEdgeIn) {
    this.coord = coord; // [x,y] of this pseudo-vertex
    this.param = param; // fractional distance of this intersection on incomming edge
    this.ringAndEdgeIn = ringAndEdgeIn; // [ring index, edge index] of incomming edge
    this.ringAndEdgeOut = ringAndEdgeOut; // [ring index, edge index] of outgoing edge
    this.nxtIsectAlongEdgeIn = nxtIsectAlongEdgeIn; // The next intersection when following the incomming edge (so not when following ringAndEdgeOut!)
  }
docs: Constructor for (ring- or intersection-) pseudo-vertices.