When in Edit Mode, I find sometimes I want to move an edge, or at least two vertices, in a direction that would be perpendicular to their orientation along their existing edge.

At that moment, the Transformation Orientation selections (Normal, Local, Global, et al) have no vectors pointing in that direction.

How might I, or is it possible to, change the "polarity" of those manipulator vectors (independent of the given selections: Global, Local, Normal, Gimble, View) so that one of them is pointing in the perpendicular direction to the line/edge between the vertices?

  • $\begingroup$ See blender.stackexchange.com/q/21248/599 $\endgroup$ – gandalf3 May 5 '16 at 21:57
  • $\begingroup$ You can create custom orientation as explained in Extrude edge along roof angle but you'll need at least a face to define an orientation. Could you better explain your example? $\endgroup$ – Carlo May 5 '16 at 21:58
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    $\begingroup$ @Carlo You can create an orientation with just an edge, two disconnected verts, or even a single vertex (using the line from the object's origin). $\endgroup$ – gandalf3 May 5 '16 at 21:59
  • $\begingroup$ Possible duplicate: blender.stackexchange.com/q/4965/599 $\endgroup$ – gandalf3 May 5 '16 at 22:01
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    $\begingroup$ @gandalf3 !!! Mhhh, I tried before writing that: maybe I wasn't paying enough attention. I'll investigate! $\endgroup$ – Carlo May 5 '16 at 22:02

Enter Edit Mode, switch to Edge selection mode, select any edge, go to the Transform Orientations panel and press the + button to add a new transform orientation while that edge is selected.

You can name your new transform orientation whatever you want, and then use it afterwards. There will additionally be created a new transform orientation named "Edge" that will hold the orientation you want.

You can then move along that edge direction, or perpendicularly to it, relative to the surrounding faces normals.

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