Custom model not rotating

Questions
1

the custom model is not rotating when it comes with particle. See this to understand the situation.

const sphereGeometry = new THREE.SphereGeometry(0.004, 16, 16);
    const particles = [];
    const originalPositions = [];
    const originalMaterials = [];
    const highlightMaterial = new THREE.MeshStandardMaterial({ color: 0x00ff00 });


    let sampler;
    let model;
    loader.load('/earth.glb', (gltf) => {
      model = gltf.scene;
      model.scale.set(0.7, 0.7, 0.7)
      // model.position.set(0, -0.7, -1);
      model.position.set(0, -0.1, -1);
      gltf.scene.traverse((obj) => {
        if (obj.isMesh) {
          sampler = new MeshSurfaceSampler(obj).build();
          const numParticles = 3000;
          for (let i = 0; i < numParticles; i++) {
            const sample = new THREE.Vector3();
            sampler.sample(sample);
            const particle = new THREE.Mesh(sphereGeometry, new THREE.MeshStandardMaterial());
            particle.position.copy(sample);
            particle.position.copy(obj.localToWorld(particle.position));
            particle.rotation.copy(obj.rotation);
            particles.push(particle);
            originalPositions.push(sample.clone());
            originalMaterials.push(particle.material.clone());
            scene.add(particle)
          }
        }
      });
    });



    const tick = () => {
      const elapsedTime = clock.getElapsedTime();
      // updateCameraPosition();
      
      if (model) {
        model.rotation.y += 0.005
      }

      // updateParticles();
      window.requestAnimationFrame(tick)
      composer.render()
    }
    tick()
  }, [])
2

You add each particle to scene directly, so it’s not rotating :thinking:

PS to have 3K meshes in the scene is not that good idea

3

so what is the good practice. for doing particle like in the video . video

4

To use THREE.Points() instead of a bunch of sphere meshes.
Then, rotate that object of points in the animation loop.