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Bob Hughes <inv### [at] aol com> wrote:
> Thought I'd try and locate this message post again so I could reply.
> I was looking into doing something like this myself long ago and again
> because you brought it up here. I figured the Spline Generator from
> Chris Colefax would suffice easily enough. Wrong. It fails to
> animate a continuous track for some reason unknown to me. It drops a
> position (tractor tread) out every frame of the animation. Well maybe
> there's still hope in the future, Chris has stated he may have a
> Spline Generator for POV-Ray 3.1 someday soon, perhaps the fix will
> appear then.
Without seeing your code I couldn't say for sure why the include file might
be missing a tread - are you using a direct spline clock counter (between 0
and 1) to return the tread positions? In this case you might find that
rounding errors are causing the last tread to be skipped. I would usually
recommend using an integer counter, from which you can calculate your spline
clock value, eg:
#declare Steps = 100;
#declare Counter = 0; #while (Counter <= Steps)
#declare spline_clock = Counter/Steps;
.....
#declare Counter = Counter + 1; #end
More importantly, I do indeed have a complete Spline macro system pretty
much waiting to go, but after posting a description on my site I had the
crazy idea of completely rewriting the memory usage to take advantage of an
apparently undocumented feature of POV-Ray arrays. Fortunately all went as
planned, and I even managed to add a couple of extra features (such as
latest message I've posted a track preview animation in
details...
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