My only thought is to calculate the center of gravity of the object (I know
probably very difficult to do).  Since the object is changing throughout the
animation, the bounding box measurement method won't likely produce a
realistic result.
A quick way is to find the center of the bounding box (easier, but probably
still inaccurate)
How sure are you that the object when transformed will have the center of
gravity along a continuous path?
That would be important for a realistic animation.

well, that's my 2 cents on the problem.

Kruger


"Tim Nikias v2.0" <tim### [at] gmxde> wrote in message
news:3e8d43ea@news.povray.org...
> I've got following problem:
> For an algorithm to behave realistic, I need to know
> the speed an object has. Problem is, I only have the
> boundary-box accessible, and this one may change
> its size. The object is macro driven and may suddenly
> become something different, or just grow at certain
> places.
>
> Thinking about it, there is no error-proof method of
> getting the speed from that, is there?
>
> Hm. Perhaps I'll need to seperate object and its
> transformation, and just apply the transformation to
> a position. This'll give me the possibility of generating
> the speed...
>
> Any other ideas?
>
> --
> Tim Nikias v2.0
> Homepage: http://www.digitaltwilight.de/no_lights
> Email: Tim### [at] gmxde
>
>

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