Let's say I have a little tent shape, like this:

tent shape

I've decided I want the bottom segment to follow the diagonal angle of the top segment instead of being vertical. I could grab the bottom four vertices and move them along the X-axis like so:

bottom four vertices selected bottom four vertices dragged along x-axis

I could also delete these vertices, and select those above them then grab or extrude along the angle. The problem is, I don't know how to do that! How can I lock the grab/extrusion to continue on along the angle of the tent?


There's a way to do it with custom orientation and scale on the 3D cursor, but it's a bit tedious, so the simplest way to get the same thing it is to delete the bottom vertices, and slide the face with GG and C to extend. You can snap on the grid (with the Absolute Grid Snap option enabled):

enter image description here

Then at the end add the edge loop where it is supposed to be

Or as pointed out by Marty Fouts, choose Normal orientation in the Transform Orientations panel and move along the good axis.

Or create a custom orientation on the face (the "+" button in the Transform Orientations panel) and extrude along the right axis, this way you keep the edge where it originally is:

enter image description here

  • $\begingroup$ One nice thing I've noticed.. GG snaps now. I'm sure it used to take no notice of snapping? $\endgroup$ Jul 7 at 6:26
  • $\begingroup$ yes it's new since 2.8 or 2.9 $\endgroup$
    – moonboots
    Jul 7 at 6:28
  • $\begingroup$ You're right I'm going to specify that $\endgroup$
    – moonboots
    Jul 7 at 6:33
  • 1
    $\begingroup$ A sometimes better way is to change the space to Normal and then extrude along the Z axis. $\endgroup$ Jul 7 at 15:25
  • $\begingroup$ Oh yes you're right, I didn't realize it was possible. Edit: Actually it doesn't work for an extrusion as it will loose the face axis, so it works like a slide. $\endgroup$
    – moonboots
    Jul 7 at 15:49

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