Path: chuka.playstation.co.uk!news
From: Robert Swan <rs108@mdx.ac.uk>
Newsgroups: scee.yaroze.programming.3d_graphics
Subject: Re: What is a normal?
Date: Mon, 17 Aug 1998 08:20:15 +0100
Organization: I wish!
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Craig Graham wrote:
> // Cross Product==Normal Vector
> void CrossProduct(SVECTOR *a, SVECTOR *b, SVECTOR *c, SVECTOR *out)
> {
>         SVECTOR ab,ac;
> 
>         ab.vx=b.vx-a.vx; ab.vy=b.vy-a.vy; ab.vz=b.vz-a.vz;
>         ac.vx=c.vx-a.vx; ac.vy=c.vy-a.vy; ac.vz=c.vz-a.vz;
> 
>         out->vx=ab.vy*ac.vz - ab.vz*ac.vy;
>         out->vy=ab.vz*ac.vx - ab.vx*ac.v.z;
>         out->vz=ab.vx*ac.vy - ab.vy*ac.vx;
> }
> 
> Then unify to length 4096 using the usual methods.

Thanks, now rather than having to write the method myself I can use
that, which will save a bit of time. At least that now means I can
complete the tmd stuff in a few weeks. I have full confidence in what
you say, considering youve done rather a bit yourself to do with
modelling.

Rob