Bob,
  I'm still pretty new at Pov and it takes time for some of these things 
to set in to the old brain. Old age I guess. I'm going to play with the 
spline points for a while till I get it all worked out.
  Thanks again for your help,
Les

bob h wrote:

> "Les Patterson" <les### [at] txcybercom> wrote in message
> news:3C5### [at] txcybercom...
> 
>> Bob,
>>   Thanks for your help in both replies.
> 
> 
> Welcome to whatever I can manage to help with.
> 
> 
>> I understand how to use (From, Using, & To) for the movements, but the
>> spline/path is giving me problems now. Also, if I can figure out the
>> spline coordinates, I might just close the end of the path closest to
>> camera and have a full figure8, keeping everything in front of the
>> camera. I can get straight lines and curved lines but no crisscrossing
>> lines or figure 8 yet.
> 
> 
> That movement you have set up is probably uneven.  The spline path will yank
> the airplane around through it as though on the end of a snapping whip, well
> what I mean is that the interploation of points between won't be very
> steady.  Of course you would like acceleration and deceleration I'm sure but
> you must be careful how you set the points up.  The spacing between them
> should relate to speed, i.e. shorter spacings are slower and longer spacings
> are faster.  There's been a lot done in the way splines are calculated
> within POV-Ray but Chris Colefax's generator macro is external and I can't
> remember how it goes about it.  Would be obvious once you've rendered out
> the animation and viewed it.
> 3D graphing paper (nonexistant I guess :-)) would be perfect for planning
> such things out.  A figure-8 wouldn't be a problem anyway, it shouldn't
> tangle up.  ;-)
> 
> bob h

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