Topic: What's the sysvar that...

[Matt__W]

...controls whether or not a viewport will zoom extents when you double-click inside to activate it?  I can't remember...   

[Matt__W]

UCSFOLLOW

(not sure how it was changed though)

[mjfarrell]

no that isn't it's real function or purpose....

The UCSFOLLOW setting is saved separately for each viewport. If UCSFOLLOW is on for a particular viewport, a plan view is generated in that viewport whenever you change coordinate systems.

Once the new UCS has been established, you can use DVIEW, PLAN, VIEW, or VPOINT to change the view of the drawing. It will change to a plan view again the next time you change coordinate systems.

0
 UCS does not affect the view
 
1
 Any UCS change causes a change to the plan view of the new UCS in the current viewport
 

The setting of UCSFOLLOW is maintained separately for paper space and model space and can be accessed in either, but the setting is ignored while in paper space (it is always treated as if set to 0). Although you can define a non-world UCS in paper space, the view remains in plan view to the world coordinate system.


So it must be something else....

[Matt__W]

So it must be something else....

No, that WAS it.

[mjfarrell]

I'm pretty sure it wasn't.

I just tested this is C3D 2012.

New view port.
UCSFOLLOW  0
activate viewport
no change
UCSFOLLOW 1
new viewport
activate
no change


That isn't the function of that variable.

Cn others please verify these results?

[alanjt]

Can others please verify these results?

Created viewport; activated; set ucsfollow to 1; deactivated viewport; reactivated viewport and it did a zoom extents.
Civil 3D 2011

I'm siding with Matt.

[mjfarrell]

Can others please verify these results?

Created viewport; activated; set ucsfollow to 1; deactivated viewport; reactivated viewport and it did a zoom extents.
Civil 3D 2011

I'm siding with Matt.

You might be siding with Matt, however a strict reading of the help file about the purpose and function of that sysvar has nothing to do with zooming a(n) activated viewport.

Could  it be that the function is a bad side effect in the version(s) you both are using and they fixed it in 2012?
I just ran the same test in completely new drawings I do not get that reaction from changing UCSFOLLOW to on or off, or off and then on.

[M-dub]

If it did what he wanted it to do, the sysvar could have been DOWHATIWANT = 1.  Maybe it's one of those weird AutoCAD things that did something it wasn't designed or intended to do.

[alanjt]

Maybe it's one of those weird AutoCAD things that did something it wasn't designed or intended to do.

Psha, that never happens.

[alanjt]

It actually does the same in 2012.

[M-dub]

Maybe it's one of those weird AutoCAD things that did something it wasn't designed or intended to do.

Psha, that never happens.

One of my faves is when the publish command sets SAVETIME to 0 and doesn't turn it back on when it's done.  Awesome!

[Matt__W]

no that isn't it's real function or purpose....

The UCSFOLLOW setting is saved separately for each viewport. If UCSFOLLOW is on for a particular viewport, a plan view is generated in that viewport whenever you change coordinate systems.

Once the new UCS has been established, you can use DVIEW, PLAN, VIEW, or VPOINT to change the view of the drawing. It will change to a plan view again the next time you change coordinate systems.

0
 UCS does not affect the view
 
1
 Any UCS change causes a change to the plan view of the new UCS in the current viewport
 

The setting of UCSFOLLOW is maintained separately for paper space and model space and can be accessed in either, but the setting is ignored while in paper space (it is always treated as if set to 0). Although you can define a non-world UCS in paper space, the view remains in plan view to the world coordinate system.

So it must be something else....

NO.... it isn't!!

[mjfarrell]

It actually does the same in 2012.

I'm using 2012 and it does NOT zoom extents any viewports I make....so it MUST be some other setting is also involved

[alanjt]

Maybe it's one of those weird AutoCAD things that did something it wasn't designed or intended to do.

Psha, that never happens.

One of my faves is when the publish command sets SAVETIME to 0 and doesn't turn it back on when it's done.  Awesome!

That's what you call a hidden feature.

[mjfarrell]

no that isn't it's real function or purpose....

The UCSFOLLOW setting is saved separately for each viewport. If UCSFOLLOW is on for a particular viewport, a plan view is generated in that viewport whenever you change coordinate systems.

Once the new UCS has been established, you can use DVIEW, PLAN, VIEW, or VPOINT to change the view of the drawing. It will change to a plan view again the next time you change coordinate systems.

0
 UCS does not affect the view
 
1
 Any UCS change causes a change to the plan view of the new UCS in the current viewport
 

The setting of UCSFOLLOW is maintained separately for paper space and model space and can be accessed in either, but the setting is ignored while in paper space (it is always treated as if set to 0). Although you can define a non-world UCS in paper space, the view remains in plan view to the world coordinate system.

So it must be something else....

NO.... it isn't!!

Matt,

Nothing you bolded says, Autocad will perform a ZOOM extents.
What it does say is that it creates a plan view.
That does not READ, performs a ZOOM Extents in any language I understand.