keycodevent2_example.ts

    /**
     * Registers the keyboard event to start game.
     */
    private _registerStartGameEvent(): void {
        // Register the space keyboard event to start the game.
        const spaceObservable = this.onKeyboardObservable.add((ev) => {
            if (ev.event.keyCode === 32) { // space bar
                this._ball.reset();
                this._ball.applyStartImpulse();
                this.onKeyboardObservable.remove(spaceObservable);

                this._gameMessageControl.isVisible = false;
            }
        });
    }