Not really sure what the issue is and my googling has come up short, I imported a model. It was rendering in the editor and ar world as translucent.

The best i could find was to try and make it Opaque or Masked, Had minor success, It does show properly in the editor now but in world it's rendered as all black

Not sure what else to try or what to google as i don't really know what's the problem. I tried lighting and some opacity mask stuff. Didn't really seem to help.

The model should look like this

A link to the model, If that helps any -