Re: Waves.

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Angus Dorbie (dorbie++at++multipass.asd.sgi.com)
Thu, 3 Jul 1997 13:24:54 -0700

On Jul 3, 8:51am, Peter Plachta wrote:
> Subject: Waves.
>
> Hi
>
> I work at DCIEM (a defence/civil reaserach facility in Toronto). We are
> working on a ship simulator, and are currently modelling the ocean.
> I was wondering if anybody knows a way to animate waves in performer. I
> have an article (SIGGRAPH, 1986, vol. 20, no. 4) which explains the
> dynamics and explains (well, sort of) how to do it using ray tracing, but
> that's way to slow. I've tried moving blue cylinders/spheres/etc. through
> a blue sheet, but it just doesn't look realistic.

Get a mesh of polygons and animate them.

A phase shifted cylindrical motion on the vertices will produce good
wave-like motion. In performer you'll have to store multiple buffers
of vertex information to avoid cracking due to Multi Processing.

Both Coryphaeus and Paradigm have dynamic sea state graphics
capabilities which they sell, and other companies which have long
since solved this problem on SGI include Marconi Simulation and
Maritime Dynamics.

Cheers,Angus.

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