declare namespace pc {

    /**
     * @name pc.Ray
     * @class An infinite ray
     * @description Creates a new infinite ray starting at a given origin and pointing in a given direction.
     * @example
     * // Create a new ray starting at the position of this entity and pointing down
     * // the entity's negative Z axis
     * var ray = new pc.Ray(this.entity.getPosition(), this.entity.forward);
     * @param {pc.Vec3} [origin] The starting point of the ray. The constructor takes a reference of this parameter.
     * Defaults to the origin (0, 0, 0).
     * @param {pc.Vec3} [direction] The direction of the ray. The constructor takes a reference of this parameter.
     * Defaults to a direction down the world negative Z axis (0, 0, -1).
     */
    class Ray {
        constructor(origin?: pc.Vec3, direction?: pc.Vec3)

        origin: pc.Vec3;
        direction: pc.Vec3;
    }
}