So yeah, shrinkwrap it be.
-- Alan
On Feb 12, 2008 8:33 PM, Greg Smith <greg(at)vfxsmith.com> wrote:
> Actually I'm pretty sure that is geometry. One of the things I liked about
> Maya was its ability to use a polygonal mesh or nurbs surface as an
> influence to the skin (envelope). Any secondary deformations that were
> applied ot that geometry would then be transposed to the weighted envlope
> mesh.
> This was was good for addressing areas like the shoulder where the
> pectoralis major connects under the deltoid. you could you could model out a
> simple pect muscle, cluster constrain one end to the rib cage and the other
> end to the upper arm bone, and voila, you get a much more predictable
> deformation in that area, then the pinching that normally occurs.
>
> I have seen methods in XSI that try to mimick this behavior where a null is
> place at every vertex of a geometry, then rather than the geometry being
> added as influence, all the nulls are enveloped instead. Done right, you get
> the same results, however it just requires much more setup time than simply
> picking a geometry and having it enveloped to your mesh.
>
> Greg
>
>
>
>
>
> really? so that isn't geometry? it is just a object with a transform that is
> included in the "smooth skin"?
>
>
> On Feb 12, 2008 7:28 PM, Alan Fregtman <alan.fregtman(at)gmail.com> wrote:
> > Hi Steven,
> >
> > Actually, we DO have that... it's the terminology that makes it sound
> confusing.
> >
> > In Maya a "smooth skin" is the equivalent of an envelope. In XSI, when
> > you add an envelope, you pick deformers (be it bones or anything) to
> > deform the envelope and these have envelope weights. In Maya,
> > deformers of an envelope (skin) are refered to as "influence objects"
> > (fun fact: ONLY joints are allowed.)
> >
> > To remove a joint [bone] from a skin [envelope] in Maya, you use
> > "remove influence object", which is the XSI equivalent of selecting an
> > enveloped mesh and going to Envelope->Remove Deformers then picking a
> > particular bone.
> >
> > And what do we do in XSI to add a new deformer to an existing
> > envelope? Well, we do "Set Envelope" and pick the new deformer! So
> > there's your equivalent.
> >
> > The only difference is that when you add an influence object it does
> > the automated weighting for you, which in XSI only happens the first
> > time you envelope, so in other words, you'd have to paint the weights
> > yourself after adding the deformer. (But hey, you always have to
> > adjust them either way, so who's complaining?)
> >
> >
> > There's no shrinkwrap effect going on in that video. (Not that such is
> > not possible in Maya.) He just has a floating single joint object with
> > a very big size. Joints look like some kind of wireframe nurb sphere.
> > Then it seems he has some expression or something to move that joint
> > as the arm goes up. It's just a deformer object though and the size or
> > shape of it doesn't actually make a difference, only its
> > transformations.
> >
> > Hope that cleared it up.
> > Cheers,
> >
> > -- Alan
> >
> >
> > ps: I totally agree with you, Thiago.
> >
> >
> > On Feb 12, 2008 7:13 PM, Thiago Costa <thiagocosta3d(at)gmail.com> wrote:
> >
> >
> > > haha what a great feature. I love the Maya workflow: Add Influence ops
> didnt
> > > work > Go to bind pose didnt work > Disable IK > Go to Bind Pose > Add
> > > Influence Enable IK again.
> > > I forget how happy I'm for do not have to do this every day anymore! :)
> > >
> > > I'm sorry I'm not helping you at all but yes Shrink wrap should do the
> same
> > > and he can connect a weight-map to mask the thing... but seriously why
> your
> > > co-worker don't just go and add a deform key god for that pose?? Then he
> can
> > > have control of each point of the mesh.
> > >
> > >
> > >
> > > On 12/02/2008, Steven Caron <carons(at)gmail.com> wrote:
> > > > trying to figure out the best equivalent to these things... a co
> worker
> > > keeps bugging me about xsi not having an equivalent.
> > > >
> > > > example of it's usage
> > > > http://www.digitaltutors.com/digital_tutors/video.php?v=96
> > > >
> > > > seems like shrink wrap deformers on clusters might do it
> > > >
> > > > thanks
> > > > steven
> > > >
> > >
> > >
> > ---
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> > unsubscribe xsi
> >
>
>
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