animating hard edge crease value parameter WAS: Bezier curves in 4.0 ?? 2004-04-29 - By Ben Kilgore
Back
Graham, I dont know if you noticed before, but I have been unable to locate
an animatable parameter for hard edge crease value (as stated in a previous
thread). Softimage support has been silent since the query was posed to
them. The only way to control it right now is with a SCOP. So, this would
be an even more exciting task now--gazillions of SCOPs to build for those
Gazillions of non-animatable hard edge parameters. With sliders. Maybe
they corrected this omission in 4?
Ben
> Like the useful feature of direct point control on SubD surfaces,
> I see 4 handles on SubD points effecting underling layers and crease
> weight as being useful too. This may seem obscure to some of you but for
> detailed organic modeling where one normally has to deal with silly
> amounts of overlapping points and edges, bezier type of control on subDs
> would be more intutive and far easier to change and animate IMO than
> gazillions of parameters in gazillions of hard edge PPGs.
>
> -- ---- ---- ---- ---- ---- --
> http://www.grahamdclark.com
> 2nd hand TD
>
>
>
> > -- --Original Message-- --
> > From: owner-xsi@(protected)
> > [mailto:owner-xsi@(protected)] On Behalf Of Luc-Eric Rousseau
> > Sent: April 28, 2004 8:11 PM
> > To: XSI@(protected)
> > Subject: RE: Bezier curves in 4.0 ??
> >
> >
> > > -- --Original Message-- --
> > > > > -- --Original Message-- --
> > > > > lofting, extruding, path constraints, merging
> > > > >
> > > > > I see absolutely no point to that... I can't think of one
> > > > > example when you'd
> > > > > want to loft, extrude etc. you Beziers.
> > > > > Keep in mind that in Beziers, all points have influence over
> > > > > the whole shape
> > > > > of curve (or surface). So moving one point would move
> > > > > something on the other
> > > > > end. Not too user friendly. Also, Beziers can get really slow
> > > > > if they have many point (i.e. not just a patch).
> > > >
> > > > that's silly, when people ask for bezier they mean
> > > > piecewize cubic bezier/
> > >
> > > Luc, could you elaborate on your comment ?
> >
> > sure, I'll elaborate.
> >
> > People who ask for bezier curve ask for what the see as
> > bezier curves in application they use, not what the
> > mathematical definition is. In theory you can have beziers of
> > any degree but the vast majority of applications implement
> > only cubic ones.
> >
> > Cubic means it's degree 3 (exponent 3 = cubic) which in turns
> > means it has 4 control points. (the degree is number of
> > control points minus one)
> >
> > The way you make a bezier curve with more points is with a
> > completely non mathematical (Andre Foisy would say 'hack')
> > method were simply make the UI show multiple segments of 4
> > control points as one curve.
> >
> > As argued in lenght in this group, the actual implementation
> > of it all doesn't matter, what matters is what Joe User
> > wants. What Joe User wants is to import logo, graphics, from
> > Freehand as pretty much the same curves, modify them, extrude
> > them, or create new curve and have handles that react in a
> > way he can guess and quickly work with. This is not
> > happening with standard NURBS control points. With cubic
> > bezier, two of the control points are directly on the curve,
> > and the other two control the bending of the curve. it's
> > very to get the shape desired. It's all user interface,
> > manipulators; in 3D it would be best done on a NURBS implementation.
> >
> >
> >
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> >
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>
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