Scaling in global axis does not work correctly if the object has rotation #42834

New Issue

Carlo Andreacchio · 2014-12-08T01:53:36+01:00

Carlo Andreacchio commented

2014-12-08 01:53:36 +01:00

System Information
Windows 7 x64 gtx 580

Blender Version
Broken: c8995ec

Short description of error
If the object has a rotation, global scaling does not work correctly

Exact steps for others to reproduce the error
step 1 : open attached blend file
step 2 : press s, y, -1 (scale global y by -1)
step 3 : notice how the empty scales correctly but the object does not.
scalebug.blend

**System Information** Windows 7 x64 gtx 580 **Blender Version** Broken: c8995ec **Short description of error** If the object has a rotation, global scaling does not work correctly **Exact steps for others to reproduce the error** step 1 : open attached blend file step 2 : press s, y, -1 (scale global y by -1) step 3 : notice how the empty scales correctly but the object does not. [scalebug.blend](https://archive.blender.org/developer/F130243/scalebug.blend)

Carlo Andreacchio commented

2014-12-08 01:53:36 +01:00

Changed status to: 'Open'

Carlo Andreacchio commented

2014-12-08 01:53:36 +01:00

Added subscriber: @candreacchio

Carlo Andreacchio commented

2014-12-08 01:56:04 +01:00

If you are scaling around a point... it puts it into the correct position, but not correct rotation (same procedure here)
scalebug-2.blend

If you are scaling around a point... it puts it into the correct position, but not correct rotation (same procedure here) [scalebug-2.blend](https://archive.blender.org/developer/F130244/scalebug-2.blend)

Julian Eisel commented

2014-12-08 14:55:37 +01:00

Changed status from 'Open' to: 'Archived'

Julian Eisel closed this issue

2014-12-08 14:55:37 +01:00

Julian Eisel self-assigned this 2014-12-08 14:55:37 +01:00

Julian Eisel commented

2014-12-08 14:55:37 +01:00

Hey @candreacchio,
It seems to me that everything works as expected. All you need to do is apply the rotation before. I might be wrong here, so if you can prove it should work differently, feel free to reopen

Anyway, thanks for the report but no bug here (I think) :)

Hey @candreacchio, It seems to me that everything works as expected. All you need to do is apply the rotation before. I might be wrong here, so if you can prove it should work differently, feel free to reopen Anyway, thanks for the report but no bug here (I think) :)

Carlo Andreacchio commented

2014-12-08 22:11:48 +01:00

Changed status from 'Archived' to: 'Open'

Carlo Andreacchio reopened this issue

2014-12-08 22:11:48 +01:00

Carlo Andreacchio commented

2014-12-08 22:11:48 +01:00

Added subscriber: @JulianEisel

Carlo Andreacchio commented

2014-12-08 22:11:48 +01:00

Hi @JulianEisel,

I think that this is a bug, as the object is clearly not scaled correctly. Applying the rotations should not be needed, and would be counter productive as we are heavily rely on instancing and keeping the local space logical. That way if there is a change needed later on it is simple to change all of the objects linked to it.

I have made a quick example... imagine this is a house... those are all windows, i have put the cursor at the point I want to scale from... pressing s, x, -1, will not have the correct rotations of the windows.

I cannot apply the rotations because then i would lose the instancing, where I can edit the mesh later easily and apply it over all of the objects, (say i get feedback from the client to make all the window frames thicker).

scalebug-2.blend

Hi @JulianEisel, I think that this is a bug, as the object is clearly not scaled correctly. Applying the rotations should not be needed, and would be counter productive as we are heavily rely on instancing and keeping the local space logical. That way if there is a change needed later on it is simple to change all of the objects linked to it. I have made a quick example... imagine this is a house... those are all windows, i have put the cursor at the point I want to scale from... pressing s, x, -1, will not have the correct rotations of the windows. I cannot apply the rotations because then i would lose the instancing, where I can edit the mesh later easily and apply it over all of the objects, (say i get feedback from the client to make all the window frames thicker). [scalebug-2.blend](https://archive.blender.org/developer/F130244/scalebug-2.blend)

Carlo Andreacchio commented

2014-12-08 23:38:31 +01:00

I apologize, I attached the wrong blend file above, Please find on this comment the correct blend file example
scalebug-3.blend

I apologize, I attached the wrong blend file above, Please find on this comment the correct blend file example [scalebug-3.blend](https://archive.blender.org/developer/F130371/scalebug-3.blend)

Julian Eisel removed their assignment 2014-12-08 23:42:11 +01:00

Julian Eisel commented

2014-12-09 16:10:07 +01:00

Added subscriber: @ideasman42

Julian Eisel commented

2014-12-09 16:10:07 +01:00

Okay, so just ignore my comment :D
@ideasman42, do you know what's up here? Bug or not?

Okay, so just ignore my comment :D @ideasman42, do you know what's up here? Bug or not?

Carlo Andreacchio commented

2015-01-12 06:14:05 +01:00

Just wondering if there has been any progress / update to this bug report?

Carlo Andreacchio commented

2015-02-16 01:46:10 +01:00

Just wondering if this is something that has been looked at yet whether it is a bug or intended to work that way?

Campbell Barton commented

2015-02-16 02:07:43 +01:00

Quick note, I didnt look into this in detail, but wouldnt attempt a fix for 2.74 unless its really obviously some silly mistake in the code (but doubt that since this code wasnt touched recently).

This area is really a can of worms & not necessarily any reasonable solution.

see: #29633, #42444, 88cc1a786b

Said, differently, its worth looking into a fix for sure, but conclusion may be there is no good way to fix (or a fix would involve having some different transform system).

Just word of warning because a quick fix here is likely to break something else.

Quick note, I didnt look into this in detail, but wouldnt attempt a fix for 2.74 unless its really obviously some silly mistake in the code (but doubt that since this code wasnt touched recently). ---- This area is really a can of worms & not necessarily any reasonable solution. see: #29633, #42444, 88cc1a786b ---- Said, differently, its worth looking into a fix for sure, but conclusion may be there is no good way to fix *(or a fix would involve having some different transform system)*. Just word of warning because a quick fix here is likely to break something else.

DenisPr commented

2015-04-23 20:10:17 +02:00

Added subscriber: @Kinetica

DenisPr commented

2015-04-23 20:10:17 +02:00

This comment was removed by @Kinetica

*This comment was removed by @Kinetica*

DenisPr commented

2015-04-23 20:16:55 +02:00

Looks like it works as expected check this link: http://blender.stackexchange.com/questions/28778/hexagon-is-distorting-on-x-axis-when-scaling-on-y-globally

Campbell Barton commented

2015-09-11 15:44:56 +02:00

Changed status from 'Open' to: 'Archived'

Campbell Barton closed this issue

2015-09-11 15:44:56 +02:00

Campbell Barton self-assigned this 2015-09-11 15:44:56 +02:00

Campbell Barton commented

2015-09-11 15:44:56 +02:00

Looked into the code again and think this this can be closed as a known limit.

This report compares scaling on a single axis, to scaling a rotated object which isn't equivalent.

Looked into the code again and think this this can be closed as a known limit. This report compares scaling on a single axis, to scaling a rotated object which isn't equivalent.

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Scaling in global axis does not work correctly if the object has rotation #42834