Hi Michael!

You are absolutely correct, Zbrush occasionally displays a more faceted version of the model to improve performance during model rotation and does not do any smoothing between vertex normals according to what I have read.

The images I attached are renders in octane (with smoothing active in the material settings) and I suspect that this is an actual geometry issue due to Zremesher algorithm/settings I used. There are other settings with Zremesher that could potentially work to avoid this issue, but it has nothing to do with MoI's export which is perfect.

And please take everything I say with a grain of salt, I am new to the terminology and the programs and I do not want to appear like I understand more than I actually do. :)