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Date: Thu, 28 Sep 1995 11:48:53 -0700 (PDT)
From: Mike McCool <[e-mail]>
To: Jerel Smith <[e-mail]>
Cc: Lightwave <[e-mail]>
Subject: Re: waterbaby
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> did take longer to render but acheived an very fifferent effect. But in
> the end i opted for straight bump mapped ripples which looked like real
> coffee in a cup. I hope this thought helps.
>

Hey Jerel,

    This is great.  Just the kind of feedback I needed.  Thanks,
you.

    I, too, am trying all sorts of combinations of bump and displacement
maps. Displacement maps require a more subdivided surface, so render
times go up dramatically, for the payoff of more realism.

    I'm able to get eerily realistic stills of a watery surface, but
my anims leave much to be desired.  I did one last night that combined
bump map ripples with a displacement map greyscale of my water surface
pic.  The color version of this pic was also mapped onto the surface as a
planar projection map, with velocity, and likewise as a reflection map.

    The resultant anim looked like ripply waving folds of lime-colored
silk.  Cool,--but not exactly the surface-of-a-swimming-pool effect I'm
working for.

    Interestingly enough, I tried simplifying things this morning,
with a two polygon plane.  Under the advice of Justin Barrett (thanks,
dude), I tried eliminating the displacement map, and going for just the
bump-mapped ripples, and with my color image planar projection-mapped
onto the surface, with the same velocity as the bump ripples.

    The anim comes much closer to the effect of a ripply-wavey water
surface, and took much less time to render.

    My problem may be that my camera needs to be right down on the
water, looking out across a big expanse of it.  From a distance, it's
easier to fool the eye into believing in the illusion of surface
movement.

    Oh well, I can't say it's not fun.

    Again Jerel (et al), thanks.


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