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Amiga Plus 1995 #5 & #6
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000485_owner-lightwave-l _Thu Apr 20 16:26:57 1995.msg
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Date: Thu, 20 Apr 1995 11:31:14 -0700 (PDT)
From: Mike McCool <mikemcoo@efn.org>
To: John Gross <jgross@netcom.com>
Cc: Lightwave <lightwave-l@netcom.com>
Subject: Re: clipmapping
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Hey John, et al,
Thanks, you, for the anti-aliasing suggestion. My manual makes
no reference to this, at least with any relation to clip-mapping.
And excuse the unspecific nature of my query. But I can't get
clip-mapping to work at all.
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.
I start with my simple plane, with four points and four polygons.
Onto this object's surface, I map my figure-pic, a six-bit ham picture,
as a planar image map, z axis, automatic sizing, with antialiasing and
pixel blending on.
Then, from the objects menu, I click on Clip Map, again with the
same six-bit Ham figure-pic mapped as a planar image map, z axis, automatic
sizing and with anitaliasing and pixel blending OFF.
To test for transparency of my plane, I have a background pic,
that my plane sits in front of. When I trace the picture, the plane is
fully visible as a black square, with my figure pic in the center. The
black areas are not clipped. It's as if the clip-map effect HAS no
effect at all, since the picture renders identically whether I have it
activated or not.
This process is such a snap in Imagine, I'm rather surprised at
having so much trouble with it in this supposedly superior program.
Again John and you others who responded, thanks, for your
attention. I'm sure it's something obvious that I'm failing to do.