3d-sphere.js

const radius = 6358137; // approximate Earth radius in meters

const origin = new Point({
  x: 0, y: 0, z: -(2 * radius)
});

const oceanSurface = new Graphic({
  geometry: origin,
  symbol: {
    type: "point-3d",
    symbolLayers: [
      {
        type: "object",
        resource: {
          href: "./sphere/scene.gltf"
        },
        width: 2 * radius
      }
    ]
  }
});
view.graphics.add(oceanSurface);