When creating Tube/Cylinder/Cone-Pyramid objects, you can specify how many pieces to be created with the Segment Count feature. As the number of parts increases, the lines of the tube/cylinder/cone-pyramid objects become rounder.
Location of the Segment Count Feature
You can access the segment count feature from the Tube/Cylinder/Cone-Pyramid object settings dialog .
Tube/Cylinder/Cone-Pyramid Examples with Different Segment Count
Tube with 3 segment
Tube with 10 segment
Tube with 50 segment
Cylinder with 4 segment
Cylinder with 15 segment
Cone-pyramid with 4 segment
Cone-pyramid with 15 segment