That's the hit.  Thank.  I remember when I first started playing with povray
(a whopping 3 weeks ago or so) I skimmed over that part thinking 'I'll look
into that later.'

Didn't make the connection in relation to this problem.

One thing though - it occurred to me this would make the value of the
'stretch' dependant on the number of frames being rendered in a set - true?

Also, I'd be glad to post the code if anyone is interested.  Is there a
particular newsgroup specific to code postings of this nature?

Again, thanks....

Andrew C on Mozilla wrote:

> Read up on POV-Ray's IO directives. The standard way to do stuff like
> this is to
> 
> 1. load position data from the previous frame
> 2. calculate (and draw) new positions
> 3. save new positions to file [overwriting what's there]
> 
> HTH.
> 
> Andrew @ home.

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