Path: chuka.playstation.co.uk!scea!peter_alau@playstation.sony.com
From: Elliott Lee <tenchi@netmagic.net>
Newsgroups: scee.yaroze.beginners
Subject: Re: Getting a sprite to leave a trail
Date: Wed, 27 May 1998 17:22:33 -0700
Organization: Cisco Systems
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References: <356C9B7A.C18CCEE4@easynet.co.uk> <6ki72j$lev11@chuka.playstation.co.uk>
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JohnT wrote:
> 
> You could try only using one video 'page' so that there is no swapping then
> just not clear the video memory between each frame.
> If you do this with frame 'page' swapping then the trail has the appearance
> of movement within it which could also be a nice effect.
> 
> JohnT

The only problem with that is that the previous impressions of the
sprite don't fade out.  :(

Phil, I take it that you're trying to do some kind of motion blur?
If so, I'd take your sprite and make about 4 or 5 copies of it at
about 20%-35% intensity and semitransparent.  The overlapping
transparent sprites will make the ones closer to the middle of the
trail a bit brighter and the ends a little darker.  Then put a
non-semitransparent copy of the sprite over the "head".  That
shouldn't take up too much GPU time.

> Ï<ò wrote in message <356C9B7A.C18CCEE4@easynet.co.uk>...
> >Hello all
> >
> >Could anyone give me some clues on how to get a moving sprite leave a
> >trail behind it? Would I need a new sprite for each bit of the trail,
> >each with its own level of brightness, to give the impression of the
> >trail fading away?
> >
> >Also, any hints on doing other special effects such as screen dissolves,
> >melts, morphs etc would be greatly appreciated.
> >
> >Thanks
> >
> >Phil
> >

- e!
  tenchi@netmagic.net
  http://www.netmagic.net/~tenchi/yaroze/