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I recently discovered vertex slide and edge slide which are very useful. Now I'm in a similar situation, but I want to move a vertex such that it stays within the plane of a face. Is there a similar way to do this?

(What I am trying to do is modelling the Szilassi polyhedron, where you could see the usefulness of such a tool.)

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  • $\begingroup$ Related? blender.stackexchange.com/questions/91700/… $\endgroup$
    – Paul Gonet
    Nov 1, 2017 at 23:34
  • $\begingroup$ Did you ever find an answer for this? $\endgroup$
    – Ryan Stout
    May 12, 2018 at 22:22
  • $\begingroup$ @RyanStout Unfortunately not. I also found out that this could only work with triangular faces, as soon as you have four vertices you do not necessarily have a planar face anymore. $\endgroup$
    – flawr
    May 13, 2018 at 7:24
  • $\begingroup$ @RyanStout There is an answer now:) $\endgroup$
    – flawr
    Jun 26, 2018 at 16:04

3 Answers 3

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You can move a vertex along the normal of the associated face. This doesn't ensure that the face was planar in the first place.

  1. Switch to Normal orientation mode.
  2. Select a Face in face mode.
  3. Scale its Z normal to 0 in face mode. SZZ0

At this point nothing should have changed. If anything changed your face was not planar to begin with.

  1. Make sure all vertices of the face only belong to a single face by ripping them. V
  2. Move them along the face normal. G⇧ ShiftZZ

ripping and moving along normal

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  • $\begingroup$ Great, thanks a lot for the detailed explanation! $\endgroup$
    – flawr
    Jun 26, 2018 at 16:04
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You can do this by the vertex “surface slide” tool from MACHIN3tools for Blender 2.79. Now not work in Blender 2.80: https://github.com/machin3io/MACHIN3tools/branches https://blenderartists.org/t/machin3tools/1135716/199

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You can duplicate your object and set the snap tool to face. When you move the vertex in edit mode it will snap to the face of your duplicated object.

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