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I am createing a model which has a cylinder shape extruded inwards, and wanted to create some sharper edges around it. I tried using the loop subdivide tool (Ctrl + R) but the "loop" part of it is only reaching half-way along the inner edge

Loop subdivide problem

The top portion of this is divided into thirds for this, and I'm not sure why this is happening.

These appear to be 4 sided shapes, so I don't think it's an ngon problem.

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    $\begingroup$ Does this help? blender.stackexchange.com/questions/17870/… $\endgroup$ – Ray Mairlot Jul 9 '15 at 13:43
  • $\begingroup$ Looks like you probably have double verts or something there $\endgroup$ – gandalf3♦ Jul 9 '15 at 19:37
  • $\begingroup$ @gandalf3 can you point out where you see this? I'm pretty new to 3d modeling so I'm not really in touch with what to look for. $\endgroup$ – Dave Lugg Jul 9 '15 at 21:02
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You probably have duplicated vertices. Here I ripped a few vertices (and moved them away which isn't the case in your model) to interrupt the flow of the loop cut:

enter image description here

This can be easily fixed by Remove Doubles.

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  • $\begingroup$ I will be able to check later today if this is the case. Is Remove Doubles something I should hit periodically if I don't expect them? Or is there a more reliable way to detect they are present? $\endgroup$ – Dave Lugg Jul 9 '15 at 14:17
  • $\begingroup$ I used remove doubles, and it removed zero vertices. So I don't think this is the problem. $\endgroup$ – Dave Lugg Jul 10 '15 at 1:45
  • $\begingroup$ Okay, I tried again, this time selecting my whole mesh first (instead of having nothing selected), and that removed 3 vertices, and now the edge loop moves around the whole way. $\endgroup$ – Dave Lugg Jul 10 '15 at 2:22
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This is most propably happening because you haven't extruded the whole thing at once, you have extruded it by parts. So you can try to just add a loop cut in this places as well. Or you can also try to press ( i ) and extrude inwards.

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