<!-- Instructions For Filing a Bug: https://github.com/GoogleWebComponents/model-viewer/blob/master/CONTRIBUTING.md#filing-bugs --> ### Description Using npm run check-fidelity results in white images with a progress bar:  Sounds like this might be related to #487. ### OS <!-- Check all that apply and please include the version tested --> - [ ] Android - [ ] iOS - [x ] Linux - [ ] MacOS - [ ] Windows ### Versions Latest master: - model-viewer: 0.3.1 - three.js: 0.101.1
