I have a problem with adding surfaces Hi I'm trying to make the surface of the object smooth
I tried 'shade smooth' on both object/edit mode.
However, I couldn't get the result as I wanted.
just like the illustration on the right,
I want the head piece to be smooth
it's polygonal and rough at the moment.
I also tried 'bevel'
but it still left the existence of the original edge
and lastly, the 'subdivision modifier'
gave me the closest result that I want.
but It also modified the surfaces that I didn't want them to be.
to make it smooth, do you have any suggestion?
just like bevel, I think if there's any other technique for adding
surfaces, that might help
The best way to do it is to give your object a Subdivision Surface modifier. As it will round the angles that you want to keep sharp, you'll have to add some edge loops close to these angles.
To make things easier you must try to keep a good edge flow. This site (topologyguides) gives some good tricks but in my opinion the more you'll try the more you'll succeed.
Here is a quick example of what you could do:
Before:

After: