code: function() {
        var min = new THREE.Vector3();
        var max = new THREE.Vector3();
  
        var minVertices = [];
        var maxVertices = [];
  
        var i, l, j;
  
        // initially assume that the first vertex is the min/max
  
        for (i = 0; i < 3; i++) {
          minVertices[i] = maxVertices[i] = this.vertices[0];
        }
  
        min.copy(this.vertices[0].point);
        max.copy(this.vertices[0].point);
  
        // compute the min/max vertex on all six directions
  
        for (i = 0, l = this.vertices.length; i < l; i++) {
          var vertex = this.vertices[i];
          var point = vertex.point;
  
          // update the min coordinates
  
          for (j = 0; j < 3; j++) {
            if (point.getComponent(j) < min.getComponent(j)) {
              min.setComponent(j, point.getComponent(j));
              minVertices[j] = vertex;
            }
          }
  
          // update the max coordinates
  
          for (j = 0; j < 3; j++) {
            if (point.getComponent(j) > max.getComponent(j)) {
              max.setComponent(j, point.getComponent(j));
              maxVertices[j] = vertex;
            }
          }
        }
  
        // use min/max vectors to compute an optimal epsilon
  
        this.tolerance =
          3 *
          Number.EPSILON *
          (Math.max(Math.abs(min.x), Math.abs(max.x)) +
            Math.max(Math.abs(min.y), Math.abs(max.y)) +
            Math.max(Math.abs(min.z), Math.abs(max.z)));
  
        return { min: minVertices, max: maxVertices };
      }
docs: Computes the extremes of a simplex which will be the initial hull