Re: XSI Montreal "Tips & Tricks" session, looking for presenters

["Tim Leydecker" <BauerOink(at)gmx.de>]

Hi Luc-Eric,

I´m sorry if this sounds stupid but how would I get to
scale that object (I did with COG activated) uniformly
and numerically precise without "shifting" it offscreen?

Why would I first have to "move center to vertices" or
"freeze all transformations" or "set neutral pose"?

I imagined it has something to do with the center shifted off
but shouldn´t this be overridden by toggling let´s say COG on?

I´d have thought any values entered are calculated relative
to the currently set coordinate system, how else could one
get reliable results - if you´d always have to do numerical input
in Global space (>Display global values in view mode) only,
modeling in a differently set space can not be accurate.

I see that for animation and especially plotting the absolute
worldspace position is important but even then when you
animate scale something (using COG) but the scaling is
calculated in a different space, how do you know what
value to add and where?

Maya is different in that respect as it only supports one mode,
there´s no differentiation between local and global, e.g. you
couldn´t end up having two different scale values but of course
could shift an object when it´s center is outside the BoundingBox.
Maya will allways show the absolute scalefactor in the channelbox,
if you scale it´s based on the pivot - which is fixed until you change
it while in XSI the center(pivot) is constantly moving between spaces.

Cheers


tim








----- Original Message ----- 
From: "Luc-Eric Rousseau" <lucer(at)Softimage.COM>
To: <XSI(at)Softimage.COM>
Sent: Wednesday, May 31, 2006 7:30 PM
Subject: RE: XSI Montreal "Tips & Tricks" session, looking for presenters


> > -----Original Message-----
> > From: Tim Leydecker
> >
> > Hi Luc-Eric,
> >
> > I´ll see if I can put together a reproducable setup asap.
> > ...
> > Voilá. Got one. Sorry for attaching, my domain is down,
> > seems my host (strato) is down, too. Can´t access my server.
> >
> > *.zip contains a *.scn file for XSI 5.1 Foundation.
> >
> > Select the wheel and scale it by entering 2 into
> > the KP/L scale attributes, hit enter.
> >
> > Object jumps away. Scares me alot.
>
> Tim, objects scale around their centers, and you moved the
> center of the object offscreen. In this particuliar case I
> haven't found a particuliar setting that would change
> Transform Panel's Scale edit boxes to do something other
> than changing the local transform's scale, but if you expected
> to scale around the center of the geometry that operation requires
> changing more than 3 parameters of the scaling.  This is
> what the manipulator does if you use it in COG mode.
>
> We'll probably add in the future a mini transform panel
> in the keying panel area to add some flexibity with references,
> but let's keep in mind the keying panel is meant for animating,
> not for modeling, and isn't changing more parameters in your
> back, or adding operators, the way that the Transform Panel is
> to compensate for centers and references.  It's the 'true'
> data of the object. It's exactly what you get in the maya channel
> box, for example.
>
>
> ---
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