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From: [e-mail] (Ken VanBrocklin)
To: [e-mail] (Lightwave)
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Organization: Alliant Techsystems, Inc.
Date: Thu, 07 Sep 1995 09:09:38 -0700
Subject: RE: swiming shark
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Ken VanBrocklin wrote:

>The  scene you are talking about used a black to grey image map, as a
>displacement map to give the shark its swimming motion. Simmilar to a
waving
>flag effect. All that is left to do in move the shark around in the scene.

Steve Axtell wrote:

>How can you apply this displacement map to the shark object and not distort
>the shape of the fins etc.?  Ax
*******************************************************************
The displacement map should distort the fins the same as the amount of
wiggle it puts in the shark.

 In the premiere issue of LightWave Pro, Mark Thompson and Grant Boucher
both did tutorials on displacement mapping. Mark Thompson's was about waving
grass and a swimming shark.  To make the shark swim he made a vertical
gradient brush map that went from black to grey to black. Used a planer
displacement map perpendicular to the side of the fish (Z axis). Sized the
brush slightly larger than the object. Gave the texture, velocity along the
Z axis to control how fast the fish will wiggle, and adjusted the amplitude
to set the amount of displacement (wiggle).
 To create a scool of fish, use clone object to make as many copies as you
like. Parent the clone's to the origional and start moving them around the
scene. To give the clones a different wiggle, just adjust the texture center
for each displacement map.
 In the same Issue of LWP, Eric Barba did a tutorial on using bones to make
a shark swim. A lot more work, but you have more control of the swimming
motion. I guess if the fish are just cruzing thru in the background, use the
displacement trick for its ease of use. If thr shark is up close and
personal, use bones.


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