In article <394249e2@news.povray.org>, "kane" 
<ann### [at] mindspringcom> wrote:

> Hi all, as part of a project I'm working on, I'm trying to create a 
> macro in either Pov or MegaPov that will create a river of sorts, a 
> line of objects on a hf.
>   You'd just enter in the x,y,z of where it should start, and the macro
> would then place an object there, then determine the next lowest 
> point, right next to the previous objects location, and place another 
> object, until it has either reached a predetermined length , reached 
> the edge of the object, or has reached a pool, or bottom where there 
> is no more lower points.

I have done something similar to this...I made a particle with mass and 
affected by gravity and used multiple calls to trace() to make the 
height field repel it. The particles kind of hover and bounce around the 
height field until they find a low area with no slope or go over the 
edge. To make the height field repel the particles, I simply used a 
bunch of trace() calls pointed from the particles current position in 
random directions.
I might still have the source code somewhere...I could look for it and 
post it if you are interested.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/

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