Uncaught reference error THREE is not defined

I am seeing the following error in dev console when trying to view some content:

Uncaught ReferenceError: THREE is not defined
    at FBXLoader.js:23
    at FBXLoader.js:3872

and

Uncaught TypeError: THREE[loaderName] is not a constructor
    at HTMLCanvasElement.<anonymous> (js_NK04fs0fyqgx2W1FUVvtdbPLDYs-ayqlruOOfrzAadk.js:9)
    at Function.each (js_DKe3Vq01R4ezrUSzDE-oi3g311k9YWd7ywkOkRLPyAw.js:2)
    at S.fn.init.each (js_DKe3Vq01R4ezrUSzDE-oi3g311k9YWd7ywkOkRLPyAw.js:2)
    at Object.attach (js_NK04fs0fyqgx2W1FUVvtdbPLDYs-ayqlruOOfrzAadk.js:5)
    at js_DKe3Vq01R4ezrUSzDE-oi3g311k9YWd7ywkOkRLPyAw.js:246
    at Array.forEach (<anonymous>)
    at Object.Drupal.attachBehaviors (js_DKe3Vq01R4ezrUSzDE-oi3g311k9YWd7ywkOkRLPyAw.js:243)
    at js_DKe3Vq01R4ezrUSzDE-oi3g311k9YWd7ywkOkRLPyAw.js:472
    at HTMLDocument.listener (js_DKe3Vq01R4ezrUSzDE-oi3g311k9YWd7ywkOkRLPyAw.js:460)

Do I need to install threejs or is it downloading from the cdn?