Path: chuka.playstation.co.uk!news
From: Jim <jim@micronetics.com>
Newsgroups: scee.yaroze.programming.3d_graphics
Subject: Re: Point light sources
Date: Wed, 30 Jul 1997 10:11:53 +0100
Organization: PlayStation Net Yaroze (SCEE)
Lines: 25
Message-ID: <33DF0559.64BEAFB5@micronetics.com>
References: <01bc9297$19d2e5a0$733261cb@beast> <33CDFDB1.66D7@interactive.sony.com> <01bc981d$7d0849e0$903261cb@beast>
NNTP-Posting-Host: jim.micronetics.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 4.0b4 [en] (Win95; I)
X-Priority: 3 (Normal)

Tyrone McAuley wrote:
> 
> 
> So we simulate point light sources by manipulating the normals of objects
> in
> relation to a parallel light source which is pretending to be a point light
> source.
> (I guess thats what you mean).
> 

This is an idea I was toying around with last night, after deciding that
the light model in gslib is pretty much useless.  I want to light up a
rather small area of a map, for an explosion, gun fire, etc..

Presently the way I think its going to go is to just point the polygon
normals around the explosion towards the lightsource vector, the normal
should just be the inversion of the light vector.  It should brighten
the ajoining polys quite neatly.  Fortunately the tmd normal data is not
used for culling.

You have any pratical experiance with this on the Yaroze? Ideas?
Is there an easier way to just illuminate a small section of a model?

Cheers
JiM