code: function(eyeVertex) {
        var horizon = [];
  
        this.unassigned.clear();
  
        // remove 'eyeVertex' from 'eyeVertex.face' so that it can't be added to the 'unassigned' vertex list
  
        this.removeVertexFromFace(eyeVertex, eyeVertex.face);
  
        this.computeHorizon(eyeVertex.point, null, eyeVertex.face, horizon);
  
        this.addNewFaces(eyeVertex, horizon);
  
        // reassign 'unassigned' vertices to the new faces
  
        this.resolveUnassignedPoints(this.newFaces);
  
        return this;
      }
docs: Adds a vertex to the hull