addSystem(system, skipSort = false)
    {
        super.addSystem(system);

        if (!skipSort) this.sortSystems();
    }
/**
     * Add a system to the renderer.
     *
     * @param {System} system - The system to add.
     * @param {boolean} skipSort - If true, will not sort the systems automatically.
     *  Setting this to true requires you call {@link Renderer#sortSystems} manually. This
     *  can be useful if you are adding a large batch of systems in a single frame and want
     *  to delay the sorting until after they are all added.
     */
Add a system to the renderer.
@param {System} system - The system to add.
@param {boolean} skipSort - If true, will not sort the systems automatically.
Setting this to true requires you call  Renderer#sortSystems manually. This
can be useful if you are adding a large batch of systems in a single frame and want
to delay the sorting until after they are all added.
Add a system to the renderer . @param { System } system - The system to add . @param { boolean } skipSort - If true will not sort the systems automatically . Setting this to true requires you call Renderer#sortSystems manually . This can be useful if you are adding a large batch of systems in a single frame and want to delay the sorting until after they are all added .
addSystem(system, skipSort = false)
    {
        super.addSystem(system);
        if (!skipSort) this.sortSystems();
    }
addSystem ( system , skipSort = false ) { super . addSystem ( system ) ; if ( ! skipSort ) this . sortSystems ( ) ; }
Add a system to the renderer.
Add a system to the renderer .