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I have a plane, as you can see below, that I would like to be the floor of a building.

How would I quickly create walls from all of the edges?

My plane

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In edge select mode (CtrlTab>Edge), select all the outer edges and press EZ to extrude along the Z axis:

enter image description here

In the above gif I used the new boundary edge selection tool, which is currently only available in the latest development builds (it will be in 2.71).

If you are using an older version, you can select the boundary edges like so:

  1. Enter edit mode (Tab)

  2. Select all (A)

  3. Press 3D view > Header > Select > Select Boundary Loop:

    enter image description here

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    $\begingroup$ How'd you do the boundary loop selection for new builds. I can't tell what you did from the screencast $\endgroup$ – MarcClintDion May 31 '14 at 8:06
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    $\begingroup$ Just press Alt+RMB on the edge twice (see this post) The old method works fine on new builds too. $\endgroup$ – gandalf3 May 31 '14 at 9:34
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    $\begingroup$ That works, thanks. It's nice to see it there now. It's a very appreciated addition to the selection tool. $\endgroup$ – MarcClintDion Jun 1 '14 at 6:45
  • $\begingroup$ Great approach and very helpful for newbies. $\endgroup$ – Vishal Kumar Sahu Nov 7 '17 at 19:47

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