const intersects = raycaster.intersectObject(globe);
      if(intersects.length > 0) {
        const point = intersects[0].point;
        const latLng = pointToLatLng(point);
        console.log("Clicked at: ", latLng);

        // If user's location is known, check if clicked location is close
        if(userLocation) {
          const distance = computeDistance(latLng.lat, latLng.lng, userLocation.lat, userLocation.lng);
          console.log("Distance to user: ", distance, "km");
          // Threshold set to 500 km for demo (adjust as needed)
          if(distance < 500) {
            triggerBlastEffect();
          }
        } else {
          alert("User location not available.");
        }
      }
    }

    // Convert intersection point to latitude and longitude
    function pointToLatLng(point) {
      // Normalize the point (assuming sphere centered at origin)
      const r = point.length();
      const lat = 90 - (Math.acos(point.y / r)) * 180 / Math.PI;
      const lng = ((Math.atan2(point.z, point.x)) * 180 / Math.PI);
      return { lat, lng };
    }

    // Haversine formula to compute distance (in km) between two lat/lng points
    function computeDistance(lat1, lng1, lat2, lng2) {
      function toRad(deg) { return deg * Math.PI / 180; }
      const R = 6371; // Radius of the earth in km
      const dLat = toRad(lat2 - lat1);
      const dLng = toRad(lng2 - lng1);
      const a = Math.sin(dLat/2) * Math.sin(dLat/2) +
                Math.cos(toRad(lat1)) * Math.cos(toRad(lat2)) *
                Math.sin(dLng/2) * Math.sin(dLng/2);
      const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
      const d = R * c;
      return d;
    }

    // Trigger fake blast effect on the webcam feed
    function triggerBlastEffect() {
      const overlay = document.getElementById('blastOverlay');
      overlay.style.display = 'flex';
      // Optional: You can add screen shake effect by modifying CSS transforms
      setTimeout(() => {
        overlay.style.display = 'none';
      }, 1000);
    }

    // Get user's geolocation
    function getUserLocation() {
      if (navigator.geolocation) {
        navigator.geolocation.getCurrentPosition(function(position) {
          userLocation = {
            lat: position.coords.latitude,
            lng: position.coords.longitude
          };
          console.log("User location:", userLocation);
        }, function(error) {
          console.error("Geolocation error: ", error);
        });
      } else {
        alert("Geolocation is not supported by this browser.");
      }
    }

    // Initialize webcam stream
    function initWebcam() {
      const video = document.getElementById('webcam');
      if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
        navigator.mediaDevices.getUserMedia({ video: true })
          .then(function(stream) {
            video.srcObject = stream;
            video.play();
          })
          .catch(function(err) {
            console.error("Error accessing webcam: ", err);
          });
      } else {
        alert("Webcam not supported by this browser.");
      }
    }

    // Event listeners
    window.addEventListener('load', function() {
      initGlobe();
      getUserLocation();
      initWebcam();
      renderer.domElement.addEventListener('click', onGlobeClick, false);
    });
  </script>
</body>
</html>