Bug in User Ortho mode: mesh flipped or corrupted #53939

New Issue

Alberto Giorgi · 2018-01-28T20:05:55+01:00

Alberto Giorgi commented

2018-01-28 20:05:55 +01:00

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: BugUserOrtho.blend

**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: [BugUserOrtho.blend](https://archive.blender.org/developer/F2017742/BugUserOrtho.blend)

Alberto Giorgi commented

2018-01-28 20:05:55 +01:00

Added subscriber: @Axa3D

Philipp Oeser commented

2018-01-29 16:51:07 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2018-01-29 16:51:07 +01:00

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...

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...

Alberto Giorgi commented

2018-01-30 23:47:05 +01:00

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

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. ![BugOrtho.jpg](https://archive.blender.org/developer/F2047622/BugOrtho.jpg) 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

Hans Peter commented

2018-01-31 10:48:04 +01:00

Added subscriber: @chnuspi1234

Hans Peter commented

2018-01-31 10:48:04 +01:00

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

cube.flv

I believe you have been tricked by an optical illusion - I hope this short video clarifies it for you :) [cube.flv](https://archive.blender.org/developer/F2056587/cube.flv)

Philipp Oeser commented

2018-01-31 19:19:29 +01:00

Changed status from 'Open' to: 'Archived'

Philipp Oeser closed this issue

2018-01-31 19:19:29 +01:00

Philipp Oeser self-assigned this 2018-01-31 19:19:29 +01:00

Philipp Oeser commented

2018-01-31 19:19:29 +01:00

@chnuspi1234 : thx for making that clearer :)
@Axa3D : 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...)

@chnuspi1234 : thx for making that clearer :) @Axa3D : 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...)

Alberto Giorgi commented

2018-01-31 23:36:01 +01:00

Added subscriber: @philipp-14

Alberto Giorgi commented

2018-01-31 23:36:01 +01:00

@Hans-6 Chnuspi (chnuspi1234) : Hi Hans, thanks for your video, now I understood!

@philipp-14 Oeser (lichtwerk) : Hi Philipp, yes both the problems are clear now.

Thanks for your times!

Ciao,

            Alberto

@Hans-6 Chnuspi (chnuspi1234) : Hi Hans, thanks for your video, now I understood! @philipp-14 Oeser (lichtwerk) : Hi Philipp, yes both the problems are clear now. Thanks for your times! Ciao, ``` Alberto

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Bug in User Ortho mode: mesh flipped or corrupted #53939