function Box(options) {
    _Box.call(this, options);
    this.normals = [
        // Order: top, right, front
        new Vec3(0, 1, 0),
        new Vec3(1, 0, 0),
        new Vec3(0, 0, 1)
    ];

    this.type = 1 << 1;
}
@class Box
@extends Particle
@param {Object} options Initial state of the body.