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000684_owner-lightwav…bcom.webcom.com_Sat Jul 29 03:38:08 1995.msg
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1995-08-06
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Date: Sat, 29 Jul 1995 06:29:57 -0400
From: PalaBart@aol.com
Message-Id: <950729062949_125637171@aol.com>
To: lightwave@webcom.webcom.com
Subject: Transparent Earth
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July 28 drowley@fafnir.rx.uga.edu (Dennis Rowley) wrote:
------------snip
I'll be experimenting with the transparent earth
trick. So far it hasn't really acheived a look of transparency.
---------------snip
Dennis,
Try a black on white mercator projection of a globe map. I got mine from
some clip art. Use the projection as a spherical Y axis transparency map on
an appropriately sized sphere. Use whatever color you want in the color
requestor and 100% diffuse, 100% transparent. This will give you solid
continents, transparent oceans. Turn on double sided in the surface
requestor, so you can see the inside of the continents.
If you have a real mercator projection, from a topo map for example, and you
want to use the continent images rather than a solid color, try this:
Convert it to black continents, white oceans, and then use it in
transparency. Use the original as a spherical image in color. That way
you'll get the topo image superimposed on the continents. Be careful to
make the continents a bit smaller than the topo image continents, that way
you won't have to struggle to line up all the bits!
Let me know how it works out.
Bart Palamaro
Dark Horse Productions
palabart@aol.com
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