Hi,
I went back to Chris Colefax's Spline Macro tutorial,
http://www.geocities.com/ccolefax/spline/ , and using one of the example pov
scenes, and making some changes, I was able to get multiple objects, but I
still can't figure out how to keep the spacing the same throughout the
animation. I emailed Chris about this and am still waiting for an answer.
By the way, I found the "roller coaster", and although it is an awesome
animation, The only moving part is a single marble, so that's no help. When
I get the time, I will try out your suggestions about delta time.
Steve Shelby

"squidian" <squ### [at] localhostlocaldomain> wrote in message
news:3ee565cb$1@news.povray.org...
> On Fri, 06 Jun 2003 09:24:51 -0400, Steve Shelby wrote:
>
> > Hi,
> > I've been trying out spline paths for the first time. There are many
> > options available to do this, and it's all rather confusing. I found
> > that "spline.mcr" seemed to be the easiest to understand and use. I did
> > not see any reference in the tutorial or elsewhere to moving multiple
> > objects (such as a train on curvy tracks or heavy traffic on a winding
> > road) along the spline. I would guess that it would involve adding some
> > kind of clock variable to each object, but I have no idea how to go
> > about it. Do any of you out there know how to do this? Steve Shelby
>
> It is not clear how much you know in asking this question. So let me
> start and tell me if I am insulting you.
>
> A spline is just a smooth curve between fixed points. If you remember
> curve fitting back in high school algebra it is basically the same thing.
>
> Adding a clock variable is delta along the spline.
>
> location(object_1) = spline*delta_time
>
> Obviously delta_time is most simply a function of the clock variable.
>
> There is a IRTC winner from a few years ago which is a ride on a roller
> coaster. You might wish to look into that and contact the author.

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