3MFLoader: fixed multiple build items refecering the same object bug (#22663)
3MFLoader: fixed multiple build items refecering the same object bug (#22663)

* fixed multiple build items refecering the same object bug

* fixed multiple children groups

* clean up

* Update 3MFLoader.js

* Update 3MFLoader.js

Co-authored-by: unknown <bfeb4859164a8cb4289b6e1577af3f507ea879a8@gmail.com>
Co-authored-by: Michael Herzog <f6aeef0c0610dd1547ce61332ac92e282a679af1@human-interactive.org>
aardgoose/three.js,gero3/three.js,WestLangley/three.js,mrdoob/three.js,donmccurdy/three.js,06wj/three.js,aardgoose/three.js,mrdoob/three.js,greggman/three.js,greggman/three.js,06wj/three.js,donmccurdy/three.js,WestLangley/three.js,makc/three.js.fork,makc/three.js.fork,fyoudine/three.js,Liuer/three.js,jpweeks/three.js,looeee/three.js,Liuer/three.js,jpweeks/three.js,gero3/three.js,looeee/three.js,fyoudine/three.js