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Bug in User Ortho mode: mesh flipped or corrupted
Closed, InvalidPublic


System Information
Windows 10 Home, GeForce GTX 950M, Cpu I7, 8GB Ram
Windows 7 Porfessional, Intel Graphic (embedded), Cpu I5, 6GB Ram

Blender Version
Broken: 2.79 5bd8ac9 - 2.77a abf6f08

Short description of error
Mesh flipped by 180 degrees on Z axis switching from wireframe to solid mode in user ortho and mesh corruption

Exact steps for others to reproduce the error
Open Blender and press (numbers on Keypad):
5 to enter in User Ortho mode
3 to select Right Ortho
tab to enter in edit mode
a to deselect all
z to switch in wireframe mode

select the four leftmost vertices
move the selection on the negative Y axis (gy-3)
move the selection on the Z axis (gz2)

a to deselect all

select the four rightmost vertices

1 to select Front Ortho
z to switch in solid mode: the mesh is flipped by 180 degree on the Z axis!

z to switch in wireframe mode
6 (or 4) a couple of times to rotate in User Ortho
z to switch in solid mode: the mesh is corruped (missing faces)!

blend file:



Event Timeline

Philipp Oeser (lichtwerk) triaged this task as Needs Information from User priority.

I am not sure if I understand correctly:

  • Front Ortho is the view from negative Y-axis
  • could you be more specific as to what your expectations are when you say 'flipped by 180 degrees'
  • I dont see any corrupt misssing faces...
  • when I open provided .blend file, everything seems as expected here

Have you checked with factory settings?

Marking as incomplete for the time being...

Hi Philips, thanks for your answer!

I tried to descrive the problem as best I can, I am sorry if I did unsecesfull, I'll try with an image.

As in the blend file, you can see a mesh with a face selected. Pressing z to switch in solid mode the selected face is no more visible, because the mesh was flipped by 180 degrees on the z axis.
I tried with the factory settings with the same result and experimented the bug on 3 pc.

Ciao, Alberto

I believe you have been tricked by an optical illusion - I hope this short video clarifies it for you :)

Philipp Oeser (lichtwerk) claimed this task.

@Hans Peter (chnuspi1234) : thx for making that clearer :)
@Alberto Giorgi (AlbertG) : left hand side of your screenshot the face is also 'back' (you just see right through in wireframe)
reg. missing faces: I think that video makes it clear?

Closing (feel free to comment again if further questions remain...)

@Hans Chnuspi (chnuspi1234) : Hi Hans, thanks for your video, now I understood!

@Philipp Kant (philipp) Oeser (lichtwerk) : Hi Philipp, yes both the problems are clear now.

Thanks for your times!