levelsio

        if (new URLSearchParams(window.location.search).get('portal')) {
            // <create start portal>
                // Create portal group to contain all portal elements
                const startPortalGroup = new THREE.Group();
                startPortalGroup.position.set(SPAWN_POINT_X, SPAWN_POINT_Y, SPAWN_POINT_Z);
                startPortalGroup.rotation.x = 0.35;
                startPortalGroup.rotation.y = 0;

                // Create portal effect