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Why when I scale vertices by zero with custom orientation, instead of getting a straight line, I get a little bit curved line.
enter image description here enter image description here enter image description here
You can see that vertices aren't perfectly aligned.
What I expected is to get perfectly straight line aligned along the custom orientation as shown in the picture below:
enter image description here

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I don't see a problem in your file?

Just in case.. to flatten to a plane .. in 2.79..

  • Select 3 points which define the plane
  • CtrlAltSpace create the Custom Orientation
  • With pivot set to 'Active' as you have done, SZZ0
  • To check the result, F make a face out of your arc, select it, and set an orthographic view to look straight down its side by hitting ShiftNumpad 3
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  • $\begingroup$ How come you don't see a problem? These edges on the left that aren't perfectly straight are scaled by zero along a custom orientation that I had defined earlier, and that right one is scaled along a global axis and then rotated. $\endgroup$
    – blablaalb
    Feb 25, 2019 at 14:12
  • $\begingroup$ @blablaalb .. reopened, double-checked.. selected both arcs, on each, filled with F, looked straight with shift 3, Shift-D duplicaled end verts to ensure straight line to compare .. looks fine! Mystery.. are you sure you're looking straight on? They're not straight to each other... $\endgroup$
    – Robin Betts
    Feb 25, 2019 at 14:20
  • $\begingroup$ i.ibb.co/BLNrn04/Clipboard01.png This is what I see from right orthographic view $\endgroup$
    – blablaalb
    Feb 25, 2019 at 14:27
  • $\begingroup$ Good.. so do I.. they're both flat/straight, but not parallel to each other... the one on the left is not orthogonal to global YZ, .. is that what you wanted? $\endgroup$
    – Robin Betts
    Feb 25, 2019 at 14:33
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    $\begingroup$ Ok sorry , apparently my custom orientation wasn't orthogonal to the global YZ axes. Sorry. $\endgroup$
    – blablaalb
    Feb 25, 2019 at 14:41

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