Re: rigging dilemma: driving a parent with attributes of the child

["Robert Moodie" <robertm(at)hybride.com>]

Yep, that's what I believe also.




----- Original Message ----- 
From: "kim aldis" <kim(at)cg-soup.com>
To: <XSI(at)Softimage.COM>
Sent: Wednesday, March 01, 2006 2:48 AM
Subject: RE: rigging dilemma: driving a parent with attributes of the child


> I'm not sure there is an evaluation order. My understanding of local and
> global is that they're both just different representations of the same
> thing. In fact, if you think about it and look at the values, they 
> couldn't
> be applied one after the other. Concatenating these two matrices would 
> give
> you the wrong results.
>
> > -----Original Message-----
> > From: owner-xsi(at)Softimage.COM
> > [mailto:owner-xsi(at)Softimage.COM] On Behalf Of brad
> > Sent: 01-March-2006 03:19
> > To: XSI(at)Softimage.COM
> > Subject: RE: rigging dilemma: driving a parent with
> > attributes of the child
> >
> > I believe the evaluation order can be ascertained by looking
> > at the node stack, same as with modeling and deformation ops.
> > Start at the bottom of the kinematic stack and work your way
> > up. Since the Global node is higher than the Local, anything
> > applied to Global, such as a constraint happens after
> > whatever effect is applied to the Local transform.
> >
> >
> > >  -------Original Message-------
> > >  From: brad friedman <xsibrad(at)fie.us>
> > >  Subject: RE: rigging dilemma: driving a parent with
> > attributes of the
> > > child
> > >  Sent: 01 Mar '06 03:12
> > >
> > >  There's the added complexity of the local transform vs the global
> > > transform.  Constraints apply to the global, not the local.  But a
> > > child's  local transform is not affected by the parent's
> > translation.
> > > An adjustment  to a global seems to trigger a change to the
> > local and
> > > visa-versa.  This is  a scenario you don't find in maya as there is
> > > but one transform.  I'm  actually a bit currious as to the
> > evaluation
> > > order of the local and global  transform in different
> > scenarios like this one.
> > >
> > >  -brad
> > >
> > >  _ANDRE DEANGELIS <ANDRE.DEANGELIS(at)UBISOFT.COM>_ wrote: Yes
> > I relise
> > > that Kim,
> > >
> > >  But having tried it and seeing hat it works (at least in a simple
> > > test),  I am wondering what makes this colution less than desirable.
> > >
> > >  Andre
> > >
> > >  -----Original Message-----
> > >  From: owner-xsi(at)Softi!  mage.COM
> > [mailto:owner-xsi(at)Softimage.COM] On
> > > Behalf  Of kim aldis
> > >  Sent: Tuesday, February 28, 2006 2:29 PM
> > >  To: XSI(at)Softimage.COM
> > >  Subject: RE: rigging dilemma: driving a parent with
> > attributes of the
> > > child
> > >
> > >  Because the rotation of the parent is driven by the child,
> > but the
> > > rotation of the parent affects the position of the child,
> > which then
> > > affects the direction of the parent, which affects the
> > rotation of the
> > > child .....
> > >
> > >  > -----Original Message-----
> > >  > From: owner-xsi(at)Softimage.COM
> > >  > [mailto:owner-xsi(at)Softimage.COM] On Behalf Of Andre DeAngelis  >
> > > Sent: 28-February-2006 19:04  > To: XSI(at)Softimage.COM  >
> > Subject: RE:
> > > rigging dilemma: driving a parent with attributes of the  >
> > child  >
> > > > There is only one parameter dependency here.
> > >  >
> > >  > If you parent one null to another and then apply a direction  >
> > > constraint to the parent (to point to the child) it workd
> > just dandy.
> > >  >
> > >  >!  ; In  fact, you can continur to rotate the parent in
> > branch mode,
> > > to
> > >
> > >  > offset the whole set-up.
> > >  >
> > >  > Am I missing something here?
> > >  >
> > >  > -----Original Message-----
> > >  > From: owner-xsi(at)Softimage.COM
> > >  > [mailto:owner-xsi(at)Softimage.COM] On Behalf Of kim aldis  > Sent:
> > > Tuesday, February 28, 2006 1:48 PM  > To: XSI(at)Softimage.COM  >
> > > Subject: RE: rigging dilemma: driving a parent with
> > attributes of the
> > > > child  >  > I'd be intrigued to see how, as rob says, the
> > child is
> > > dependant  upon  > the parent which is dependant upon the
> > child, which
> > > is dependant upon  > the parent which is dependant upon the child
> > > which ...... And the  > whole thing rapidly crawls up it's
> > own arse.
> > > Whichever software you  > use.
> > >  > Would have been the same in SI3D too.
> > >  >
> > >  > > -----Original Message-----
> > >  > > From: owner-xsi(at)Softimage.COM
> > >  > > [mailto:owner-xsi(at)Softimage.COM] On Beh!  alf Of
> > David Gallagher
> > > > > Sent: 28-February-2006 18:39  > > To: XSI(at)Softimage.COM  > >
> > > Subject: Re: rigging dilemma: driving a parent with  >
> > attributes of
> > > the  > > child  > >  > >  > > Maya has its benefits. It
> > handles this
> > > situation better  > unfortunately.
> > >  > >
> > >  > > > I don't see how you can avoid a cycle.
> > >  > > >
> > >  > > > As soon as you tranlsate the child in negative Y the
> >  > parent
> > > rotates  > > > causing the child to move causing the parent
> > to rotate
> > > > causing the  > > > child to move...
> > >  > > >
> > >  > > > _rob
> > >  > >
> > >  > >
> > >  > >
> > >  > > --
> > >  > > David Gallagher
> > >  > > Animator, Blue Sky Studios
> > >  > >
> > >  > > ---
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