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When I try to extrude a face on a cube that has a subdivision surface modifier it's always circular. Even when using edge loops. How can I achieve this? I'm new so I'm sure I'm missing something here. There is still a lot of things I don't know how to do.

I would like to know how to get a box shaped extrusion (like the type of extrusion that you get on a cube with no subdivision surface on it) on a cube that has the subdivision surface modifier on it. The picture below shows what happens when I extrude on this cube that has the subdivision surface modifier on it. How can I make that circular extrusion rectangular?

Top picture is subdivision turned off and then you see in the bottom picture that when I turn it on my extrusion becomes circular.

Here is subdivision surface switched off

Here is subdivision surface turned on

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  • $\begingroup$ Can you post a screenshot of your edgeloops? Maybe they are not enough or in the wrong position. See related questions: blender.stackexchange.com/questions/6425/… $\endgroup$
    – Carlo
    Aug 12, 2015 at 22:06
  • $\begingroup$ I updated the original post. I'll check out those links. Thanks. $\endgroup$
    – Josh Firicano
    Aug 12, 2015 at 22:18

3 Answers 3

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Select the end face, and the four edges. Next press Shift+E to crease the selected edges. You can also crease the edge loop at the base to make the extrusion like a cube. This method works mostly the same for extruding inwards as for extruding outwards. You may need to crease more edges, especially those on the face.

Ill

enter image description here

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  • $\begingroup$ Thanks for the response. What you showed here is what I do, but once I make an extrusion on one of those faces it is circular. I have updated my original post to show this. I want to be able to make the extrusion rectangular on a cube that has the subdivision surface modifier. $\endgroup$
    – Josh Firicano
    Aug 12, 2015 at 22:28
  • $\begingroup$ If you don't mind extra polygons, try beveling. Select a loopcut and press Ctrl+B $\endgroup$
    – J Sargent
    Aug 12, 2015 at 22:30
  • $\begingroup$ I'm confused as to how you are pulling on that circle extrusion and making it a square. This is what I'm talking about though $\endgroup$
    – Josh Firicano
    Aug 12, 2015 at 22:36
  • $\begingroup$ Use shift+e, and then move the cursor away $\endgroup$
    – J Sargent
    Aug 12, 2015 at 22:51
  • $\begingroup$ I'm trying this, but I can't do it successfully. What parts of the extrusion do you have selected when doing this? $\endgroup$
    – Josh Firicano
    Aug 12, 2015 at 23:22
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Make loopcuts along in the planes that are parallel to the circular face's normal and slide them.

enter image description hereenter image description hereenter image description here

Or crease all the edges around the border with Shift+E

enter image description here

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  • $\begingroup$ Thanks for the response! While this does work, it messes up the symmetry of other extrusions I have. Is there any way to do it without loop cutting? I would like to be able to just do it to each extrusion separately if that is possible. $\endgroup$
    – Josh Firicano
    Aug 12, 2015 at 23:20
  • $\begingroup$ You can "loop cutting" and than "remove doubles" on the vertex of the mesh where you want to remove the loopcut effect. So it will affect only the wanted part. Or you can crease edges, did you try? $\endgroup$
    – Carlo
    Aug 12, 2015 at 23:32
  • $\begingroup$ Here is a gif I just made. I'm selecting the faces and then using shift+e gifmaker.cc/… $\endgroup$
    – Josh Firicano
    Aug 12, 2015 at 23:40
  • $\begingroup$ Extend your edge selection to at least all the edges shown in the last pic of the answer. Subdivision surface take in account not only one face, but also its neighbors. $\endgroup$
    – Carlo
    Aug 12, 2015 at 23:50
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Select the end face, and the four edges. Next press Shift+E to crease the selected edges. You can also crease the edge loop at the base to make the extrusion like a cube. This method works mostly the same for extruding inwards as for extruding outwards. You may need to crease more edges, especially those on the face.

Thanks for the help everyone! This is an awesome community!

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  • $\begingroup$ No problem, anytime :) $\endgroup$
    – J Sargent
    Aug 13, 2015 at 0:12

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