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From: [e-mail] (Justin Barrett)
Subject: Re: About Clip mapping
Date: Sat,  9 Sep 1995 05:34:00 GMT
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Organization: Ten Forward BBS in Port Angeles, WA 360.452.7681
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On 8 Sep 95, [e-mail] spoke up and said:

Rc> I am trying to use a moving texture of flames to create a fire object in
Rc> LW.  I almost get what I am after by using a combination of clip and
Rc> image mapping with some transparency..  Only trouble is that the edges
Rc> of the flams are too hard (sharp).  I set the edge settings to
Rc> transparent and the value to about 100, and this works, but only for the
Rc> edges of the object proper and not for the individual cutouts applied by
Rc> clip mapping.

That's the way clip mapping is.  It works similar to the Toaster's
luminance key, which uses the brightness of the image's pixels to
determing which ones are keyed out and which ones stay.  There's no soft
edge in luminance keying, and likewise there's no soft edge in clip
mapping.  The clip map uses the brightness of the image to determine what
is clipped and what stays.  If a given pixel is above a certain RGB
value (which I don't know offhand.....anyone?), the corresponding part of
the object will be clipped.

I'd suggest using the image map as a transparency map, possibly with
Negative Image turned on.  This way, the brighter parts of the flames will
be the least transparent, and the area around the flames will be totally
transparent (assuming it was shot against a black background).

I'm curious...where is the fire sequence coming from?

         Justin Barrett - [e-mail] - 1:350/401
    Free Spirit Productions   -   Northland Cable   -   Peninsula College

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