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For the example lets say there are two groups of faces. Is there a way to make them face one direction uniformly?

two groups of faces

What I've tried so far: Set pivot center for transform as Active Element and transform orientation as Normal. Then select all faces in question with the face to which other faces will align selected last. Then S Z Z 0. Problem is: the second group of faces will (predictably) go out of its place too much:

too much

Is there a way to leave it more or less in the position it was before the transform while making the faces facing the same direction nevertheless?

P.s. I've also tried to create new orientation to apply it to another group of faces (the same S Z Z 0), but a) it will clamp the geometry to a line if applied to the faces and b) it more or less works with vertices but there are problems aligning them to other axis and it is really time consuming.

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yes, there is. Set the pivot to individual elements instead of active element and scale them to zero along the desired axis.

There is a way to setup custom transform orientations if normal, view, global, local etc. does not offer the desired axis. I believe you can find it here further down the page.

https://www.blender.org/manual/editors/3dview/object/transform/transform_control/transform_orientations.html

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  • $\begingroup$ Thank you! Setting the pivot to individual elements and then scaling them to 0 along Z makes the faces' facing-direction uniform only in their "group", but not universally, BUT thanx to your answer it occurred to me I can set custom orientation not only via two vertices but from the face I want other faces to align with. And this was it worked. Thank you again. $\endgroup$
    – Troika__
    Commented Dec 25, 2016 at 13:46
  • $\begingroup$ "this waY it worked" - fixed, as I am unable to edit comments. Ok, so for those who might be interested how to make it work, in detail: choose the face you want other faces to share direction with. Create custom orientation from it (see the link above), it will appear in the Transform Orientation tab, choose it there. Set Pivot Center for Transform to Individual Origins, then select all the faces you want to change their facing and hit S Z Z 0. That's it. $\endgroup$
    – Troika__
    Commented Dec 25, 2016 at 13:56

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