How to use the mage-engine.SceneManager.camera function in mage-engine

onCreate() {
        //ControlsManager.setOrbitControl();
        const cube = this.sceneHelper.addCube(20, 0xffffff);
        this.sceneHelper.addCube(40, 0x00ffff);

        SceneManager.camera.position({y: 70, z: 150});
        SceneManager.camera.lookAt(0, 0, 0);

        cube.position({y: 40});
    }
}

onCreate() {
        SceneManager.camera.position({y: 70, z: 150});
        SceneManager.camera.lookAt(0, 0, 0);

        this.setTranformControls();
        this.enableInput();

        this.sceneHelper.addGrid(2000, 100);
    }
}

onCreate() {
        ControlsManager.setOrbitControl();
        window.cube = this.sceneHelper.addCube(20, 0xffffff);

        SceneManager.camera.position({y: 70, z: 150});
        SceneManager.camera.lookAt(0, 0, 0);

        this.sceneHelper.addGrid(200, 20);
        cube.position({z: 10});
    }
}

onCreate() {
        ControlsManager.setOrbitControl();
        window.cube = this.sceneHelper.addCube(20, 0xffffff);

        SceneManager.camera.position({y: 70, z: 150});
        SceneManager.camera.lookAt(0, 0, 0);

        this.sceneHelper.addGrid(200, 20);
        cube.position({z: 10});
    }
}

onCreate() {
        SceneManager.camera.position({y: 70, z: 150});
        SceneManager.camera.lookAt(0, 0, 0);

        this.setTranformControls();
        this.enableInput();

        this.sceneHelper.addGrid(2000, 100);
    }
}

onCreate() {
        //ControlsManager.setOrbitControl();
        const cube = this.sceneHelper.addCube(20, 0xffffff);
        this.sceneHelper.addCube(40, 0x00ffff);

        SceneManager.camera.position({y: 70, z: 150});
        SceneManager.camera.lookAt(0, 0, 0);

        cube.position({y: 40});
    }
}