How to deal with this mess to make this mesh smooth. I was using circle to make it
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1$\begingroup$ Related: blender.stackexchange.com/questions/39326/modeling-a-bullet/… $\endgroup$ – Carlo Apr 30 '18 at 16:02
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The subdivision modifier won't produce good results with triangles in the geometry. (Carlo mentioned this answer, which showcases how the modifier works on topology.)
To solve this, use quads only.