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Can you tell me how can I get rid of the bumps and dents and make the object in the picture smoother and look closer to sphere at the top and on the sides (like a light bulb)? I already applied subdivision surface modifier but it does nothing to get rid of the bigger bumps and dents. enter image description here. I made this by first applying subdivision surface modifier to a cube and then scaling up the upper parts and scaling down lower parts. This is what i get but I want to make it look better without bumps and dents

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The topology of a cube after a subdivision has been applied is still a cube, just with more geometry and in a rounder shape. If you want the shape at the top to be rounder you have a few options, just bear in mind that you can only push the existing cube geometry so far into the shape of a sphere.

Smooth vertices

example geometry with smooth vertices

Smooth vertices and laplacian smooth are in the vertex menu of edit mode. They will relax the geometry a bit and make faces more even.

To Sphere

side by side comparison of to sphere

To Sphere will take a selection and push it into a sphere. You can combine this with a smooth vertices to further tame the geo.

Combine a sphere

You can also add a UV sphere (matching the number of vertices around the sphere and your mesh), by deleting the top of your mesh and the bottom of your sphere and using bridge edge loops you can connect the two sections. enter image description here

The benefit of this method is it doesn't require you to do any repairs to the existing mesh.

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    $\begingroup$ thanks a lot. smooth vertices worked to a great extent (I'd say 75%), although not complete. A few questions based on your answer. 1)Laplacian smooth did nothing. Why it might be? 2) When I said transform to sphere, a big thick black circle appeared on my screen . When I moved my mouse it only greatly distorted my geometry. So I didnt do it. What is that big black sphere I have no idea. 3) I added a sphere but how can I match the number of vertices of that sphere and my existing mesh? $\endgroup$
    – upstream
    Commented Feb 22 at 7:23
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    $\begingroup$ Since the whole of your object seems to be based on circular shapes, why didn't you start modelling with a UV Sphere instead of a cube in the first place? $\endgroup$
    – John Eason
    Commented Feb 22 at 9:23
  • $\begingroup$ Laplacian smooth has an iterations parameter, you might need to balance the effects strength and iterations. To sphere can be quite agressive, especially with a high dpi mouse. You can click to apply it and then drag the strength of the operator to fine tune it. To match the vertices just count the selection (there's a setting in the interface pane which had scene data, it'll tell you how many vertices you have selected too). Definitely worth considering John's point, you could extrude a square section out of a UV sphere instead of the other way around. $\endgroup$
    – Mophs
    Commented Feb 22 at 22:49

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