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000526_owner-lightwave-l _Mon Oct 31 19:23:08 1994.msg
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From: 92malikh@wave.scar.utoronto.ca (MALIK HAMMED MAHMOUD)
Message-Id: <9411010044.AA23581@wave.scar.utoronto.ca>
Subject: Re: Negative Lights
To: lightwave-l@netcom.com
Date: Mon, 31 Oct 1994 19:44:48 -0500 (EST)
In-Reply-To: <9410280135.AA18845@cns.cscns.com> from "James Jones/Nibbles and Bits" at Oct 27, 94 07:35:49 pm
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>Negative light sounds like something called a "flashdark" I once saw
>in a cartoon... it cast a pool of dark instead of, ah... light. :)
I haven't used a rendering package with this feature but I remember
someone talking about it in the comp.graphics newsgroup. Apparently
negative lights are useful for negating effects of other light sources
(duh..:-) eg. if you've got too much light shining into a hole in the
ground and changing the intensity/position of the original light source
isn't feasible, you could stick in a 'light eater' in the hole. One guy
on the newsgroup went as far as saying that absence of negative lights
is a bug! I promptly tried a neg value for a light in LW and found out
that LW has this bug :-) Apparently its not that hard to implement
negative lights.
hammed