sphere.js

// create the sphere's material
const sphereMaterial =
      new THREE.MeshLambertMaterial(
        {
          color: 0xCC0000,
          wireframe: true
        });

// Set up the sphere vars
const RADIUS = 50;
const SEGMENTS = 16;
const RINGS = 16;

// Create a new mesh with
// sphere geometry
const sphere = new THREE.Mesh(

  new THREE.SphereGeometry(
    RADIUS,
    SEGMENTS,
    RINGS),

  sphereMaterial);

// Move the Sphere back in Z so we
// can see it.
sphere.position.z = -400;

// Finally, add the sphere to the scene.
scene.add(sphere);