Hermite curves are a type of spline.  I think they're easier
to specify, and they're piecewise smooth across control points.
For camera animations, that means that the velocity is smooth
from one portion of the curve to the next.  Each control point
is specified by a point and vector and the direction and 
magnitude of the vector (again for something like a helicopter)
determines the speed it's traveling both into and out of the
control point.
I know about splines, but hermites are more the way I tend to
think about animations...

Emory

Peter Hertel wrote:
> 
> "Gwen & Emory Stagmer" <emo### [at] comcastnet> skrev i melding
> news:3D8### [at] comcastnet...
> > I've got a generic curve generator called POVHerm.  It generates
> > .INC files that give you a 3D Vector for each frame in the scene.
> 
> Sounds much like a spline to me. Except you can call a spline within POV-Ray
> without use of any .BAT or include files. Docs [6.1.9] - Spline dentifiers.
> Then again, teaching an old dog new tricks? :)
> 
> > Peter's examples are great!  I've been using POV for so long
> > (since 2.2 I think) and macros are kinda new, so I tend not to
> > use them too much - you can teach an old dog new tricks, but
> > it takes more milk bones!! ;)
> 
> Thank you! Macros are a awesome tool! I've been using POV-Ray since v3.1,
> (already for 4 years.. :-) But I learn new stuff (almost) every day. It
> always take some time before I start to use the new things I learn though..
> But macros are one thing that have saved me a lot of work.
> 
> -Peter
> http://hertel.no/peter

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