code: function findPoints(point, radius, skipSelf, octant, result) {
  
  	const children = octant.children;
  
  	let i, l;
  
  	if(children !== null) {
  
  		let child;
  
  		for(i = 0, l = children.length; i < l; ++i) {
  
  			child = children[i];
  
  			if(child.contains(point, radius)) {
  
  				findPoints(point, radius, skipSelf, child, result);
  
  			}
  
  		}
  
  	} else if(octant.points !== null) {
  
  		const points = octant.points;
  		const rSq = radius * radius;
  
  		let p;
  
  		for(i = 0, l = points.length; i < l; ++i) {
  
  			p = points[i];
  
  			if(p.equals(point)) {
  
  				if(!skipSelf) {
  
  					result.push({
  						point: p.clone(),
  						data: octant.data[i]
  					});
  
  				}
  
  			} else if(p.distanceToSquared(point) <= rSq) {
  
  				result.push({
  					point: p.clone(),
  					data: octant.data[i]
  				});
  
  			}
  
  		}
  
  	}
  
  }
docs: Recursively finds points that are inside the specified radius around a given
  position.
  
  @private
  @param {Vector3} point - A position.
  @param {Number} radius - A radius.
  @param {Boolean} skipSelf - Whether a point that is exactly at the given position should be skipped.
  @param {Octant} octant - The current octant.
  @param {Array<Object>} result - An array to be filled with objects.
  @property {Vector3} point - A point.
  @property {Object} data - The data that belongs to the point.