Using subsurface modifier on circle So, I'm trying to use a subsurface modifier on my mesh, but it displays weirdly... I know how to use edge loops on a square side, but how can I make this work on a circle side ? 


The bottom face is made as best as I could, by merging two extruded vertices.
You can select the bottom face and use the INSET TOOL (Hotkey : I) to adjust.

But Keep in mind you have a N-GON(poly with more than 4 verts) down there, and subsurf and ngons don't work great together.

You can fix this deleting the NGON face, select all the boundary verts, extrude the verts/edges and scale them to the center