In the above picture we have a render of Michael 6, the standard version on the left and the HD version on the right. Zooming in closer we can see that his abs and knees for example have a lot more detail – as we’d expect from an HD version of a model.
Comparing the two Michaels in our viewport instead of the render however, we can barely make out a difference. Both figures look nearly identical (except for the belly button indentation perhaps).
So why is that, and how can we preview those HD details before we render them?
The secret lies in our viewport’s subdivision levels.