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Date: Wed, 29 Jun 94 08:16:02 PDT
From: [e-mail] (Bill Mills)
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Subject: Re: growing or stretching object over keyframes
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My approach to filling the well with sand, etc.

Create the 'core' sand object, make a surface map that has horizontal color
banding (to represent layers of strata - not necessary, but it would
look cool), then create a transparency map.  Cylinder map it around the core
on the y axis (oh yeah, map the strata surface map the same way).  Then
The transparency map should be a 2 color image and can be quite small.
It simple needs to have a line dividing in the middle (for extra fun this
line can be wavy) above the line it should be black, and below the line
it should be white.  When applying it as a transparency map, tweak the
SIZE and velocity values (using a positive Y velocity) so that the 'solid'
rendered portion of the core moves upward (if you drew a wavy line, add a small
x velocity and the sand will appear to build up unevenly).  IMHO the look
of the strata would add class/realism to the image (if it is supposed to build
up over long periods), and this can not be achieved by stretching, morphing
the object, as your strata would stretch as well.

The drawback to this approach is that it MUST be viewed from the side, as there
will be no 'top' to the sand that is piling up.  Hmmm, actually if you were
crafty, and you did need to get in close on the top of this core as it
is piling up, you could tripple and subdivide the top of the core.  Then
use a fractal noise to displacement or bump map it (as the sand is piling
up.  In this instance you would not need to use a transparency map, but would
move the core up the well shavt.  You would set the surface map (the strata)
to have a velocuty on the Y axis that is -1*the Y velocity of the core.  Thus
the strata map is stationary relative to the well.  The top of the core would
even be changin color here to match the strata that is accumulating.

Be seeing you...
-Bill Mills


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