Rick Measham wrote:

> My flying shopping cart is completed and flaps its wings. My next
> challenge is to put the cart on a spline and have it fly round a
> predefined path.
> 
> I've no idea how to do that!
> 
> Firstly I need to define the path. That doesn't seem too hard as it's
> all just beziers.
> 
> Secondly, I need to somehow calculate the position on that spline at
> which the cart will sit in each frame. No idea on that one.
> 
> Thirdly I need to get the vector of the spline at that point so that I
> can point the cart in the right direction. No idea here either.
> 
> Fourthly I need to get the (stationary) camera to follow the cart as it
> travels around the spline. Figure I'll sit the camera at some point and
> point_at the position in the 'secondly' section.
> 
> Can anyone talk me through this, or better yet, point me to a simple
> tutorial on how to do it?
> 
> Cheers!
> Rick

Maybe it's not your case but may help others reading this thread.
I discovered recently that you can use Inkscape to export your splines (or
paths) to povray. I haven't tried it yet, but I'm sure in this way you can
ease the process. At least you can define your splines in a visual way
(though limited to 2D).

Hope this helps.

-- 
Txemi Jendrix
www.txemijendrix.com

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