I want to smooth the top side of this ring:
The mesh of the top side of the ring is very obvious in the rendered image and basically this is my problem.
I am a beginner in Blender but I have tried everything I know. First off, I have made the selection of the top side of the ring manually in edit mode because couldn't find an easier way. Then, I have tried to subdevide the selection but it won't subdevide anything except for some faces. I have tried
ctrl+R to make cuts but it doesn't work.
The ring is the result of an extruded 2D vector and then sliced vertically using Knife project tool and then bent 360 degrees using simple deform modifier
My question is how can I smooth just the top side of the ring without the edges?