Thanks for the detailed explanation. I know the center path is a spline as I
use this extensively in another scene where it works very well. I then went
on to assume that one could control the outer surface as well. It seemed a
reasonable assumption based on the linear spline and b spline results.Thats
the trouble with making assumptions. I will stick with the b spline - it
works fine for my needs.
Richard

news:9a8bguo643ubbncriskpc1a9pumoqtn6pe@4ax.com...
> On Mon, 10 Jun 2002 21:29:52 +0200, "Richard" <pop### [at] iprolinkch> wrote:
> > I read in the help that "cubic splines produce the most flexible and
smooth
> > curves" but this does not seem to be the case with sphere sweep. The
> > linear:spline and b_spline work as advertised but the cubic-spline seems
to
> > curl in on itself and produce a sharp step. This code illustrates this.
Is
> > it supposed to do this?
>
> Personally I think that's your mistake. Whole sphere_sweep object is NOT
> spline. It is object which controls its parameters with splines. The path
> where centers of spheres are placed is spline. The radius function in
'time'
> is spline. If the max radius is 'bigger' than curvature/run of center
spline
> then smaller radii with theirs centers are completly hidden inside big
radius.
> Moreover You took quoted sentence from 'lathe' chapter not from
sphere_sweep
> one. Lathe is not sphere_sweep either. I hope my answer was understable
since
> my English limits such explanations.
>
> ABX

Post a reply to this message