The interaction you describe is more or less a
very physical one: water hits against a rock and
thus, water masses tumble before it, creating the
waves. The water will then be washed away by
the current, but new water also washes against the
rock. Its an ongoing difficult process which isn't
handled by my simulation at all.
In my simulation, the waves caused by wave-emitters
all move at steady speed: 1 node per step. Still, its
not too unrealistic to just move them downstream. Ever
observed raindrops hitting a river? Its the same
effect taking place. But the interaction at the rocks
lacks some physical precision, which is why I am
thinking about some other means which are just
meant to build some basis for a near-realistic still-
frame, and some animated turbulence on the surface
should give a visually acceptable river. Here's a
link to a nice program which is what I'm after:
http://john.deweese.com/StableFluids/

Regards,
Tim

-- 
Tim Nikias v2.0
Homepage: http://www.digitaltwilight.de/no_lights
Email: Tim### [at] gmxde

> Hi!
>
> You are on the right track! Moving the data at 2 nodes per step, stops the
> height from adding up unrealistically? Fine! I wonder though.. Do your
> system works so that all horisontal movements has a steady speed?  Imagine
> the wind direction is -1*x  and you have a rock somewhere that blocks that
> movement. This will cause waves to bounce off in different directions, and
> some waves will go directly the opposite way  ( 1*x )... In your system,
> will they continue in that direction with the same speed and fade out?  In
> real life, I suppose they will fade and change speed, to eventually end up
> going at -1*x  again.
>
> This may not be necessary to simulate, though, as the effect might be
> subtle?
>
> > To work, the simulation requires some rain
> > or lots of wave-emitters, which looks rather
> > irregular, but it might do for some scenes
>
> Fortunately, your system does not slow down with the use of many wave
> emitters.
>
> > still pondering about another set of macros
> > designed to just model the basic flows of the
> > stream, and then superimpose some irregular
> > waves on that later...
>
> Sounds very interesting!
>
> > Regards,
> > Tim
>
> Hugo
>
>

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