Hi Karla,

you could try it like this:

cylinder{<point of particle>, <point ofparticle>+<direction>*velocity,
radius}

This would create a cylinder starting at the location of the particle, and
pointing in the specified direction.

Is this what you mean?

Greets,
JWV


"karla" <kar### [at] hotmailcom> wrote in message
news:web.40dc4b9ed18daaf0100aded90@news.povray.org...
> Hi,
> I wanted to ask if anyone knows how to create streamlines.  I am
visualizing
> particles in a box that have a velocity. what I want to do is be able to
> create a streamline or an arrow that origines in the particle and points
> toward the {x,y,x} that I specify.
> I would appreciate if anyone can help
> thank you
>
> karla
>
>

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