How to extrude inside mesh while keeping relative proportions from edges

Question

I can select the mesh letter I, extrude it on the X axis and scale it inward to create an edge around it.

When I do the same process with the mesh letter O, the result is this:

I would like to be able to create an identical inward edge that is inside the larger object, not only on the letter O but on any other mesh object.

How can I do this?

And how can I get rid of the face behind the newly extruded edge?

EDIT: I tried insetting but the mesh letter O looks like this:

Looks like you want insetting rather than extruding. Try undoing extrusion and running I to inset. Also seems that scale for the object on the right isn't applied (Object mode > Ctrl+A) — Mr Zak, Dec 10, 2017 at 20:05
Tried insert, but the result is imperfect due to how the faces are generate - imgur.com/a/pxfu2 — Marek Andreansky, Dec 10, 2017 at 20:12
What there is such unusual in how "faces are generated" for that mesh? Inset works incorrect when transforms aren't applied, did you check if they are? Is the O object (one on the left) just a circle extruded inwards? If not then show its wireframe (object in Edit mode, Wireframe shading) and in Solid mode, perspective view. Or upload it blend-exchange.giantcowfilms.com and share — Mr Zak, Dec 10, 2017 at 20:59
Added the test file to the question. If you look at the O in the top right corner you will see what I mean. Want the inside to be a perfect O as well. — Marek Andreansky, Dec 10, 2017 at 21:19

cgslav · Accepted Answer · 2017-12-10 21:32:10Z

2

Select all internal Edges and delete them.
Select whats left (two circles should left) and press Ctrl+E and choose Bridge Edge Loops.
Press I and Inset is working fine also you will have neat topology.

answered Dec 10, 2017 at 21:32

cgslav

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$\begingroup$ Thank you! Is there an easier way to select the inside edges besides selecting everything but the edges, then select inverse? Could be an issue with larger meshes. $\endgroup$
– Marek Andreansky
Dec 10, 2017 at 21:37
$\begingroup$ Or a way to convert a vector to a mesh in such a way that this process is not needed? $\endgroup$
– Marek Andreansky
Dec 10, 2017 at 21:39
$\begingroup$ I was using "C" for Circle Select. You can also select outward edges and invert them or try to select one from the inside and Shift + G to Select Similar. $\endgroup$
– cgslav
Dec 10, 2017 at 21:39
$\begingroup$ @MarekAndreansky Sadly no, only manual retopology will give you nice results. Unfortunately converting from Text to Mesh is pretty messy. $\endgroup$
– cgslav
Dec 10, 2017 at 21:40
$\begingroup$ Yes, tried converting a few vectors and had to fix most of them manually. Either way, thank you very much Luke!! $\endgroup$
– Marek Andreansky
Dec 10, 2017 at 21:47

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