Count Visible Objects for Three.js

countVisibleObjects.ts

function countVisibleObjects(scene: THREE.Scene | THREE.Group | THREE.Object3D): number {
  return scene.children.reduce(
    (acc, obj) => {
      if (obj.visible) {
        return (obj.children.length) ? acc + countVisibleObjects(obj) + 1 : acc + 1
      }
      return acc
    },
    0
  )
}