calcBox() {

		this.box = this.bounds.clone();

		// offset small amount to account for regular grid
		this.box.min.x -= 0.01;
		this.box.min.y -= 0.01;
		this.box.min.z -= 0.01;

		return this;

	}
Prepares {@link Octree#box} for the build.

@return {Octree} A reference to this Octree.