EnigmA Amiga Run 1995 November/EnigmA AMIGA RUN 02 (1995)(G.R. Edizioni)(IT)[!][issue 1995-11][Skylink CD].iso/earcd/docs/lwml9505.lha/LWML9505.TXT/[e-mail]_Wed May 24 23:25:41 1995.msg

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Date: Thu, 25 May 95 07:28 BST-1
From: [e-mail] (Stephen Loughran)
Subject: Re: model/background edge blending
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On Wed, 24 May 1995, [e-mail] wrote:

>  I've got a question/problem. I doing animated sprites for a video game.
>These sprites need to have cast shadows with no anti-aliasing between the
>character and the background. I've been rendering three passes for each
>sprite animation. One pass with anti-aliasing and save 24bit color turned
>on, the second pass with no anti-aliasing and save 8bit alpha turned on -
>using that wonderful new shadow alpha feature to produce the cast shadows,
>and the third pass with no geometry loaded compositing the image sequence
>from the first render though the image sequence from the second render onto
>a solid grey background. I then convert the resulting image sequence into a
>flic and fill the background with 0 black.
>  The problem I'm having is even though I'm rendering the alpha sequence
>with no anti-aliasing the shadow still seems to have a one shade transition
>between it and the background. So I have to go back and remove them manually
>frame by frame. Does anyone have a solution to this? Allen? I am using
>traced shadows not shadow maps.
>Paul Davies
>Concept Artist-RPG/Action Games
>Magnet Interactive Studios Inc.

    i had the exact same problem when i was called upon to render some
sprite for one of the games we are producing here. i would always end
up with either a shitty looking render (no anti aliasing) but *NO* edge
blending, or a good render but *WITH* edge blending. i could have gone
through them all by hand and sorted them out but i had to render 29
bodies, 20 heads and 4 sets of weapons, all which have 440 frames
each... err... quick calculation shows that it would not be feasible to
touch up 23320 frames by hand :( i could not find a way of doing it
with the quality i wanted... we eventually brought forward the date of
buying some Silicon Graphics machine to run Alias which has a composite
render option. this allows you to determine how much of and edge pixel
needs to be covered before it is completely on.... it does no
model/background anti aliasing and the results are better than i was
expecting for 32 pixels tall :) If Allen could add this option to a
later Lightwave, it would be a great help to those of us who use
lightwave in the games industry....

    steve

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[e-mail]  |   SGI Indy2 (175MHz, 96Mb RAM) 1Gb SCSI-II
                            |   $Gb Micorpolis, CD-ROM , 16Gbx4  DAT Tape
Steve Loughran,             |   Alias PowerAnimator v6.0
Millennium Interactive Ltd, |   A2000/030@40MHz 1Mb CHIP 12Mb FAST,
Great Shelford,             |   Picasso II, GVP G-Lock, Scala MM300
Cambridge,                  |   Lightwave v3.5, Imagine, Essence, Vista,
England.                    |   AdPro, Scala MM300..anything I've missed?
Tel: [phone]      |   Oh yes, my beloved Yamaha YZF750R :)
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