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Date: Wed, 10 Apr 1996 05:24:15 -0700
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From: Daniel Dugour <[e-mail]>
To: Multiple recipients of list <[e-mail]>
Subject: Re: Water
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At 01:34 10-04-96 -0400, Scott wrote:
[DELETE]
>I have a glass modeled out that has a solid form(actually has
>thickness not flat polys, just incase it helps) and I am trying to put a
>liquid in it that I can make a ripple accross the top of.  What I thought
>about doing was put aplainar poly acros the top of where I would want the
>liquid to be and use a displacement map to distort the surface in to a
>ripple like movement.  My problem is how do I limit the edge of the ripple
>so that it doesn't exit through the sides of the glass?
>
Hello Scott,

If there isn't a particular reason to use displacement mapping (like a shot
from the side of the glass with huge waves crashing over the rim ;) ), why
don't you use the procedural ripple bumpmapping? Just get the center right,
use one source, and adjust the amplitude, speed, wavelength, etc. (Too bad
this can't be animated...nice feature for LW5.0?)

Another way would seem to me, to do the thing with the displacement map,
save transformed (maybe several key-frames stages of the movement), and use
modeler to adjust thes stages so they do not exit through the sides of the
glass (with the glass in a background layer that would not be too hard, and
use Foris Powerview to check it; just hide the outer wall of the glass,
leave just the inner poly's and the liquid surface).
Use these stages as morphing targets. In the experimental features of LW
(already discussed here and activated by ctrl-shift-F1), ctrl-shift-F2 when
in the objects panel activates multiple target morphing. 100% = target 1,
200% = target 2, etc. Figure this out for yourself, I haven't worked with it
yet (but I think you have to use a morph chain, in which object 2 is the
target of object 1, and object 3 is the target of object 2, etc.).

Hope this helps,

Daniel Dugour, AniTime 3D Computer Animation
Bilderdijkstraat 181-3a
NL-1053 KR AMSTERDAM
The Netherlands
Phone/Fax: [phone]
eMail: [e-mail]