code: function(eyeVertex, horizon) {
        this.newFaces = [];
  
        var firstSideEdge = null;
        var previousSideEdge = null;
  
        for (var i = 0; i < horizon.length; i++) {
          var horizonEdge = horizon[i];
  
          // returns the right side edge
  
          var sideEdge = this.addAdjoiningFace(eyeVertex, horizonEdge);
  
          if (firstSideEdge === null) {
            firstSideEdge = sideEdge;
          } else {
            // joins face.getEdge( 1 ) with previousFace.getEdge( 0 )
  
            sideEdge.next.setTwin(previousSideEdge);
          }
  
          this.newFaces.push(sideEdge.face);
          previousSideEdge = sideEdge;
        }
  
        // perform final join of new faces
  
        firstSideEdge.next.setTwin(previousSideEdge);
  
        return this;
      }
docs: Adds 'horizon.length' faces to the hull, each face will be linked with the horizon opposite face and the face on the left/right