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I'm trying to extend an edge from the existing roof face axis. How can I do this? I want it to go all the way down to the lower part of the building. It must connect there (I want a edge there too so the remaining right part of that lower building will be cut off).

example mesh diagram

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You can create new transform orientation for that edge.

Select side face of the roof. In the N panel create new transform orientation (you can create it pressing Ctrl + Alt + Space, as Gonzou mentioned):

enter image description here

The created orientation should be selected as active. If it isn't, in Alt+Space menu select this orientation (it will be called something like Face). Switch to Edge selection mode, select your edge, extrude it, cancel moving by Esc and start grabbing pressing G twice.

enter image description here

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  • $\begingroup$ I think both answers are good but this seems to be the most simple one :) Thanks $\endgroup$ – Nique Sep 13 '15 at 20:01
  • $\begingroup$ Quick tip: To quickly create a new transformation orientation you may use a Shift + Alt + Space shortcut. $\endgroup$ – Paul Gonet Sep 13 '15 at 20:29
  • $\begingroup$ Did you mean Ctrl+Alt+Space ? And thanks, I will edit the answer $\endgroup$ – Mr Zak Sep 13 '15 at 20:32
  • $\begingroup$ Yeah, Ctrl + Alt + Space of course :). My mistake. $\endgroup$ – Paul Gonet Sep 13 '15 at 22:29
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  1. Select the face of the roof.
  2. Press ShiftNumPad 7 to move the view to that face.
  3. Change the Transform Orientation (in the 3D view header) to "View".
  4. Press E ShiftY (to exclude the Y axis from the movment)

A new edge perfectly aligned to the roof.

Altogether in an animated gif:
animated gif

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  • 1
    $\begingroup$ +1 This one is better then Mr. Zak's because after a while of doing this you can end up with ALOT of transforms. $\endgroup$ – GiantCowFilms Sep 13 '15 at 20:34
  • $\begingroup$ @GiantCowFilms As for me, I drop them immediately after transforms. The View method doesn't work for me because it makes me to recover the 3D view alignment which I don't like. But maybe that's just me. $\endgroup$ – Mr Zak Sep 13 '15 at 20:45
  • $\begingroup$ @MrZak blenderartists.org/forum/showthread.php?218403. I dont personally use it, but looks useful. $\endgroup$ – David Sep 13 '15 at 21:07
  • $\begingroup$ This would work as well with the knife tool to make a cut on the face on the other side of the building. $\endgroup$ – cegaton Sep 13 '15 at 21:38
  • $\begingroup$ @cegaton I'm not following. will you head over to chat and explain further? $\endgroup$ – David Sep 13 '15 at 21:39
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enter image description here

In the image above a loop cut was made. Next we viewed the angles as indicated. The vertex of the loop cut was moved until angles were within tolerance. You may may have zero tolerance capable hands. In this example the angle in question is about 44 degrees. Finish by adding and deleting faces.

The loop cut allows deletion of faces.

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  • $\begingroup$ Very well explained. But i'll stick with Mr Zak's answer because its simple :). Thanks! $\endgroup$ – Nique Sep 13 '15 at 20:03

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