Auto Perspective option does not work with Viewport orbit snap #53904

New Issue

Ludvik Koutny · 2018-01-25T14:40:47+01:00

Ludvik Koutny commented

2018-01-25 14:40:47 +01:00

System Information
Windows 10, GTX1080Ti

Blender Version
Broken: 2.79
Worked: probably never

Short description of error
It appears that Auto Perspective option found in Interface tab of user preferences works only when aligned views (Front, left, top, etc...) are entered via a hotkey press. When aligned view is entered through viewport orbit snap feature (Holding down Alt key while orbiting), Auto Perspective option won't automatically switch perspective despite viewport label changing to an aligned view. This severely limits usefulness of this feature

Exact steps for others to reproduce the error
1, In user preferences, Interface tab, enable Auto Perspective option.
2, Switch views using numpad keys. Notice the feature works
3, Set viewport mode to perspective, and orbit around the viewport while holding Alt key. The viewport will snap to aligned views, but perspective won't change to orthographic despite Auto Perspective being enabled.

**System Information** Windows 10, GTX1080Ti **Blender Version** Broken: 2.79 Worked: probably never **Short description of error** It appears that Auto Perspective option found in Interface tab of user preferences works only when aligned views (Front, left, top, etc...) are entered via a hotkey press. When aligned view is entered through viewport orbit snap feature (Holding down Alt key while orbiting), Auto Perspective option won't automatically switch perspective despite viewport label changing to an aligned view. This severely limits usefulness of this feature **Exact steps for others to reproduce the error** 1, In user preferences, Interface tab, enable Auto Perspective option. 2, Switch views using numpad keys. Notice the feature works 3, Set viewport mode to perspective, and orbit around the viewport while holding Alt key. The viewport will snap to aligned views, but perspective won't change to orthographic despite Auto Perspective being enabled.

Ludvik Koutny commented

2018-01-25 14:40:47 +01:00

Added subscriber: @Rawalanche

blender-admin commented

2018-01-25 14:40:47 +01:00

#58361 was marked as duplicate of this issue

Philipp Oeser self-assigned this 2018-01-25 16:10:16 +01:00

Philipp Oeser commented

2018-01-25 19:20:05 +01:00

While this would be a nice feature to have, this is not a bug.

Code and tooltip are pretty explicit this is only happening when leaving top/front/side:

Automatically switch between orthographic and perspective when changing from top/front/side views

That being said, I agree

having ortho happening on numpad is a nice thing to have already
having ortho happening on snapping would be a nice thing to have

added as TODO https:*wiki.blender.org/index.php/Dev:Source/Development/Todo/Editors#3D_View:_Interaction

btw. manual description is mixed up as well atm.

would be interested in doing this, will look into this asap

While this would be a nice feature to have, this is not a bug. Code and tooltip are pretty explicit this is only happening when leaving top/front/side: > Automatically switch between orthographic and perspective when changing **_from_** top/front/side views That being said, I agree - having ortho happening on numpad is a nice thing to have already - having ortho happening on snapping would be a nice thing to have added as TODO [https:*wiki.blender.org/index.php/Dev:Source/Development/Todo/Editors#3D_View:_Interaction ](https:*wiki.blender.org/index.php/Dev:Source/Development/Todo/Editors#3D_View:_Interaction) btw. [manual ](https://docs.blender.org/manual/en/dev/preferences/interface.html#prefs-interface-auto-perspective) description is mixed up as well atm. would be interested in doing this, will look into this asap

Ludvik Koutny commented

2018-01-25 20:18:17 +01:00

Hello,

if the tooltip states "Automatically switch between orthographic and perspective when changing from top/front/side views" then the tooltip description may be wrong, because Auto Perspective does not only switch to ortho when entering the top/front/side views but it also switches back to perspective when initiating orbit to exit from top/front/side views. What I mean to say is that it works both ways, bot when entering top/front/side views and when exiting them.

Hello, if the tooltip states "Automatically switch between orthographic and perspective when changing _from_ top/front/side views" then the tooltip description may be wrong, because Auto Perspective does not only switch to ortho when entering the top/front/side views but it also switches back to perspective when initiating orbit to exit from top/front/side views. What I mean to say is that it works both ways, bot when entering top/front/side views and when exiting them.

Campbell Barton commented

2018-01-25 22:20:40 +01:00

Added subscriber: @ideasman42

Campbell Barton commented

2018-01-25 22:20:40 +01:00

An issue with switching back to ortho on snapping is it will only happen at some orientations.

If turntable is used this is mainly an issue for top/bottom views - where you may snap to the top but look down from a different rotation.

The result would be snapping to the top would only switch to ortho if it matches pressing Numpad7.

We could switch to ortho but keep the view named "User Ortho".

Or we support named views at different rotations (Top / Top -90 / Top 90 / Top 180).

Either way this isn't a bug, archiving since it's been added to our TODO.

An issue with switching back to ortho on snapping is it will only happen at some orientations. If turntable is used this is mainly an issue for top/bottom views - where you may snap to the top but look down from a different rotation. The result would be snapping to the top would only switch to ortho if it matches pressing Numpad7. We could switch to ortho but keep the view named "User Ortho". Or we support named views at different rotations (Top / Top -90 / Top 90 / Top 180). Either way this isn't a bug, archiving since it's been added to our TODO.

Campbell Barton commented

2018-01-25 22:24:24 +01:00

Changed status from 'Open' to: 'Archived'

Campbell Barton closed this issue

2018-01-25 22:24:24 +01:00

Ludvik Koutny commented

2018-01-30 11:46:26 +01:00

In #53904#481641, @ideasman42 wrote:
An issue with switching back to ortho on snapping is it will only happen at some orientations.

If turntable is used this is mainly an issue for top/bottom views - where you may snap to the top but look down from a different rotation.

The result would be snapping to the top would only switch to ortho if it matches pressing Numpad7.

We could switch to ortho but keep the view named "User Ortho".

Or we support named views at different rotations (Top / Top -90 / Top 90 / Top 180).

Either way this isn't a bug, archiving since it's been added to our TODO.

Hi, sorry for replying to this archived one.

I would simply make a condition for perspective/ortho switch to be when viewport perspective "camera" aligns to any of the world axes regardless of its roll. So as long as user snaps perspective view camera to to any of the +X/-X,+Y/-Y or +Z/-Z world axis direction, the perspective would be switched to ortho, and as soon as that ceases to be the case, it would switch back to perspective.

From my user point of view, here is how I use this feature: I really like that I can freely snap to world axis aligned views holding down alt key because numpad keys are very far away from where you hand rests on your keyboard, and aligning view to a world axes is extremely frequent operation especially when it comes to selecting mesh elements that are lined up across one or two axes, doing precise cuts with for example knife or bisect tool, or even placing objects precisely on top of others. So this snapping feature removes necessity of traveling my hand long distances to the numpad key.

The issue however is that while you want world axis aligned views to be ortho, to be able to do precise mesh editing, selection and placement, you don't want your non-aligned views to be ortho because orthographic perspective tends to distort the appearance of the 3D object (human brain is not used to orthographic view) it's a lot harder to evaluate 3D shapes. Now while there is a partial win of not having to travel to numpad keys when switching aligned views, I still have to travel there to toggle between perspective and ortho, which basically defeats the purpose, and therefore there is no gain from enabling auto perspective as long as an user uses orbit snapping instead of numpad keys to align views.

> In #53904#481641, @ideasman42 wrote: > An issue with switching back to ortho on snapping is it will only happen at some orientations. > > If turntable is used this is mainly an issue for top/bottom views - where you may snap to the top but look down from a different rotation. > > The result would be snapping to the top would only switch to ortho if it matches pressing Numpad7. > > We could switch to ortho but keep the view named "User Ortho". > > Or we support named views at different rotations (Top / Top -90 / Top 90 / Top 180). > > Either way this isn't a bug, archiving since it's been added to our TODO. Hi, sorry for replying to this archived one. I would simply make a condition for perspective/ortho switch to be when viewport perspective "camera" aligns to any of the world axes regardless of its roll. So as long as user snaps perspective view camera to to any of the +X/-X,+Y/-Y or +Z/-Z world axis direction, the perspective would be switched to ortho, and as soon as that ceases to be the case, it would switch back to perspective. From my user point of view, here is how I use this feature: I really like that I can freely snap to world axis aligned views holding down alt key because numpad keys are very far away from where you hand rests on your keyboard, and aligning view to a world axes is extremely frequent operation especially when it comes to selecting mesh elements that are lined up across one or two axes, doing precise cuts with for example knife or bisect tool, or even placing objects precisely on top of others. So this snapping feature removes necessity of traveling my hand long distances to the numpad key. The issue however is that while you want world axis aligned views to be ortho, to be able to do precise mesh editing, selection and placement, you don't want your non-aligned views to be ortho because orthographic perspective tends to distort the appearance of the 3D object (human brain is not used to orthographic view) it's a lot harder to evaluate 3D shapes. Now while there is a partial win of not having to travel to numpad keys when switching aligned views, I still have to travel there to toggle between perspective and ortho, which basically defeats the purpose, and therefore there is no gain from enabling auto perspective as long as an user uses orbit snapping instead of numpad keys to align views.

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Auto Perspective option does not work with Viewport orbit snap #53904