I have a following problem: I have a sphere and I want to extrude particles out of it like so:
But I want the extrusion to be rounded like in this picture: 
What kind of settings do I miss please?
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- $\begingroup$ I dont know where that lower image comes from but I guess he is using subsurface modifier (press Strg+2) $\endgroup$HenrikD– HenrikD2018-12-02 14:24:25 +00:00Commented Dec 2, 2018 at 14:24
- $\begingroup$ I think this is it. But when I use it it applies on my whole object. How to apply it only on my extruded one? $\endgroup$chazecka– chazecka2018-12-02 14:57:59 +00:00Commented Dec 2, 2018 at 14:57
- 1$\begingroup$ W -> Smooth Subdivide? Isnt quite the same but I think it will do what you want $\endgroup$HenrikD– HenrikD2018-12-02 15:38:19 +00:00Commented Dec 2, 2018 at 15:38
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1 Answer
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You can't apply a subsurf to part of an object, but you can control the way it subdivides. Consider this object
If I apply the subsurf I get
It solves your problem by rounding, but it rounds where you don't want it to. There are several ways to fix this, depending on your need. Here are a couple.
You can bevel edges and control how the rounding happens, perhaps making it less obvious
Select edges you want to control
Enter CTRL-B. The cursor will change. Moving it controls the width of the bevel. Rotating the scroll wheel controls the number of steps
You can use the bevel modifier to accomplish the same thing but with more control.
You can create edge loops. Consider the base of the extrusions. Enter CTRL-R. Place your cursor near the base of it until a red line appears around the extrusion 
Left-Click and then move the line where you want it
Left-Click again.
My example would require a lot of edge loops or a lot of bevels. Here's a version with all of the edge loops selected.
