 look into it. Therefore we need a camera.
            // Three.three-js offers three camera types:
            //  - PerspectiveCamera (perspective projection)
            //  - OrthographicCamera (parallel projection)
            //  - CombinedCamera (allows to switch between perspective / parallel projection
            //    during runtime)
            // In this example we create a perspective camera. Parameters for the perspective
            // camera are ...
            // ... field of view 