When I create a polygon, there are three quality display settings in Maya: rough, medium and smooth. What is the use of these display qualities in realtime and what does smoothness really indicates? I mean: is it actual object that is shown after rendering is done and why does a polygon looks like a disoriented sphere, when I press 3? My friend suggested to use insert edge loop tool to make look like a sphere, is this the right process?[![enter image description here](https://i.stack.imgur.com/eaAdW.jpg)](https://i.stack.imgur.com/eaAdW.jpg)

What is the difference between the above and below image and should I make the bottom image look like a smooth square with the insert edge tool before I start working on it?

[![enter image description here](https://i.stack.imgur.com/xmxud.jpg)](https://i.stack.imgur.com/xmxud.jpg)