Add visual Octree Helper (#23478) (#23481)
Add visual Octree Helper (#23478) (#23481)

* Add visual Octree Helper

* null pointer bugfix

* Refactor OctreeHelper.

* Update OctreeHelper.js

Co-authored-by: Michael Herzog <f6aeef0c0610dd1547ce61332ac92e282a679af1@human-interactive.org>
greggman/three.js,aardgoose/three.js,WestLangley/three.js,aardgoose/three.js,donmccurdy/three.js,mrdoob/three.js,06wj/three.js,gero3/three.js,makc/three.js.fork,greggman/three.js,jpweeks/three.js,jpweeks/three.js,gero3/three.js,Liuer/three.js,donmccurdy/three.js,06wj/three.js,makc/three.js.fork,mrdoob/three.js,WestLangley/three.js,Liuer/three.js