[Bf-committers] Weird Armature update bug

[Ton Roosendaal]

Hi,

It is pretty understandable, that constraints create lagging... that  
was a problem with the old parenting/tracking system as well. I hacked  
in a 'sorting' routine, to make sure the objects are calculated in the  
right order.

The current constraints don't do that. Meaning, that when a window  
updates, it also recalculates positions, hence the errors seem to go  
away.

For the future, I would love to see the Constraint system improved  
further. Hopefully,  with such a generic relationship system, we can  
implement a good pre-compiling that makes Constraint evaluation  
predictable and lag-free...

-Ton-

(BTW: afaik the Render routines calculate a position twice, to make  
sure lagging is reduced... during ALT+A playback that is not done, for  
speed)


On Thursday, May 15, 2003, at 22:16 Europe/Amsterdam, instinctive new  
media wrote:

>
>
> Hi people,
>
> I don't know if this is a known bug, but I thought Ton might know best  
> about
> it, so i decided to bring it up here.
>
> I just had the weirdest display update issue:
>
> I have a complex armature setup with various tracktos/copy position
> constraints (but NO IK solvers), the camera tracks the character.
>
> Now when i change frames (no matter if in ALT-A or manually), some of  
> the
> objects "fall behind" the armature by at least one frame! This is most
> noticable with the camera itself: In camera view, you can see the  
> camera's
> rectangle ITSELF rotating around the viewport! (I.E., the viewport  
> doesn't
> rotate, the camera wireframe does!)
>
> This messed up state even persists when you hit ESC to stop the  
> animation.
>
> THe funny part: as soon as the screen is updated (move the mouse to a
> different space, switch workspaces, etc.), the errors are gone,  
> everything
> seems OK.
>
> Did anyone ever see this behaviour?
>
> | alexander ewering           instinctive new media
> | ae@instinctive.de       http://www.instinctive.de
> |
> | fon: +49-2393-220558         fax: +49-2393-220559
>
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>
------------------------------------------------------------------------ 
--
Ton Roosendaal  Blender Foundation ton@blender.org