Creating a IIIF Manifest
So we now have our files ready for the web, but how do we get them to appear in the Universal Viewer? The final step is to create a IIIF manifest. This requires using the IIIF Presentation v3.0 spec which as of this writing is not yet ratified by the community.
Here is an example: https://gist.github.com/edsilv/261d75e30c1d8a30cd5f5bf2396e37b1
Ensure that the 'example.com' URLs resolve to your own public web address.
On line 24 you can see where the .obj file is being referenced. As long as the .mtl and .png/.jpg files are in the same directory they will be loaded in the UV.