JavaScript-Sandpit/small_cube_mouse_movement.html at main · johnstack/JavaScript-Sandpit · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
  <title>Cursor-Following Wireframe Cube</title>
  <style>
    body {
      margin: 0;
      overflow: hidden;
      cursor: none;
    }
    canvas {
      display: block;
    }
  </style>
</head>
<body>
  <script src="https://cdn.jsdelivr.net/npm/three@0.158.0/build/three.min.js"></script>
  <script>
    const scene = new THREE.Scene();

    // Use orthographic camera so world units = pixels
    let width = window.innerWidth;
    let height = window.innerHeight;
    const camera = new THREE.OrthographicCamera(
      -width / 2, width / 2,
      height / 2, -height / 2,
      0.1, 1000
    );
    camera.position.z = 500;

    const renderer = new THREE.WebGLRenderer({ alpha: true });
    renderer.setSize(width, height);
    document.body.appendChild(renderer.domElement);

    // Create a wireframe cube
    const geometry = new THREE.BoxGeometry(200, 200, 200); // 200px cube
    const edges = new THREE.EdgesGeometry(geometry);
    const material = new THREE.LineBasicMaterial({ color: 0x888888 }); // grey
    const cube = new THREE.LineSegments(edges, material);
    scene.add(cube);

    let mouse = new THREE.Vector3(0, 0, 0);
    document.addEventListener('mousemove', (event) => {
      mouse.x = event.clientX - width / 2;
      mouse.y = -(event.clientY - height / 2);
    });

    function animate() {
      requestAnimationFrame(animate);

      // Smoothly move cube toward cursor
      cube.position.lerp(mouse, 0.15);

      // Rotate cube
      cube.rotation.x += 0.01;
      cube.rotation.y += 0.01;

      renderer.render(scene, camera);
    }

    animate();

    // Handle window resize
    window.addEventListener('resize', () => {
      width = window.innerWidth;
      height = window.innerHeight;
      camera.left = -width / 2;
      camera.right = width / 2;
      camera.top = height / 2;
      camera.bottom = -height / 2;
      camera.updateProjectionMatrix();
      renderer.setSize(width, height);
    });
  </script>
</body>
</html>