function AABB(body) {
    this._body = body;
    this._ID = body._ID;
    this.position = null;
    this.vertices = {
        x: [],
        y: [],
        z: []
    };
    this.update();
}
Axis-aligned bounding box. Used in collision broadphases.

@class AABB
@param {Particle} body The body around which to track a bounding box.