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To: mikemcoo@efn.org
Organization: Calumet College, York University
Date: Fri, 21 Apr 1995 13:15:29 -500
Subject: Re: clipmapping
Cc: lightwave-l@netcom.com
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>Date: Thu, 20 Apr 1995 15:29:30 -0700 (PDT)
>From: John Gross <jgross@netcom.com>
>Subject: Re: clipmapping
>To: Mike McCool <mikemcoo@efn.org>
>Cc: Lightwave <lightwave-l@netcom.com>
>
>>
> > I have a simple plane, sitting vertically in front of the camera,
> > like a movie screen. Onto this, I'm mapping a pic that has a figure in
> > the center, with black, color 0, all around it. My assumption with
> > clipmapping is that all this color 0 area should be 'removed' from the
> > plane onto which it's mapped, so that the figure appears to stand out
> > there in space. All the background color 0 should be transparent, at
> > least if I understand clipmapping.
>
>
> Clip mapping functions by using the luminosity (brightness) values of the
>image you are using as the clip map. Any luminosity values above 50% gray
>will be clipped, while those below won't be. Therefore, the parts you want
>clipped should be white. Any thing you don't want clipped should be black
>(or at least below 50% gray)
>
> JG
Perhaps he could use a B&W dithered image map, with shadow mapping and high
fuzzness (sp?), it might work out, or at least produce a strange shadow