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From: [e-mail] (robert hood)
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Subject: Re: underwater
To: [e-mail] (Jerel Smith)
Date: Mon, 25 Sep 1995 07:28:14 -0700 (PDT)
Cc: [e-mail]
In-Reply-To: <[e-mail]> from "Jerel Smith" at Sep 25, 95 00:04:24 am
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>
> I know this is not new but i would love to know how the underwater light
> that ripples over the surfaces of vessels and the sea bed were done.
> Ive tryed a couple of things like putting a luminance ripple across every
> surface but this is pretty render intensive. I would like to be able to
> shine a light "through " water and have the apropriate light values
> (prefably with soft shadows ala shadow map).

Off the top of my head:

   1. Create a large polygon, and move it up and off camera.
   2. Apply the underwater texture to this polygon as a clip map.
   3. Give the texture a velocity so that it moves slowly
   4. Place a spotlight above the clip-mapped polygon with
      "shadow map" turned on.

This may not be perfect, but something along those lines should get you
going.

Render me gone,               |||
Bob                         ^(===)^
-------------------------oOO--(_)--OOo--------------------------------------
Bob Hood            | Bureaucracy destroys initiative.  There is little that
                    | bureaucrats hate more than innovation, especially
Work: 303-730-1324  | innovation that produces better results than the old
Home: 303-980-8392  | routines.  Improvements always make those at the top
[e-mail]    | of the heap look inept.  Who enjoys appearing inept?
[e-mail]      |                               - Frank Herbert
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