Path: chuka.playstation.co.uk!news
From: "Harvey.C" <hc054@mdx.ac.uk>
Newsgroups: scee.yaroze.programming.3d_graphics
Subject: Re: 2d sprites in a 3d world
Date: Sun, 29 Nov 1998 15:13:42 +0000
Organization: PlayStation Net Yaroze (SCEE)
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Message-ID: <366164A6.660A@mdx.ac.uk>
References: <36610839.30F5@mdx.ac.uk> <366152D4.FDA4A6B3@scee.sony.co.uk>
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James Russell wrote:
> 
> "Harvey.C" wrote:
> >
> >
> > I managed to get this code working, and sure enough I got my sprite on the screen with
> > the correct x,y position and depth priority. However, it positions the sprite relative
> > to the camera, not the world.
> >
> > For example, my game uses a chase cam for the car (using the super field). When I
> > display the sprite at say 0,0,5000 it will position it in front of the of the camera
> > regardless of the position or direction of the camera!
> 
> Hmmmm... Are you sure you're using the right matrix (GsWSMATRIX, sorry, I forgot the 'WS' part in
> the code that I posted)? If you're using that, are you using it _after_ you call GsSetRefView2()?
> 
> Also, I recall that ApplyMatrixLV doesn't add in the translation of the matrix. So try this:
> 
>         ApplyMatrixLV(&GsWSMATRIX,&spritePosition, &transformedPosition);
>         transformedPosition.vx += GsWSMATRIX.t[0];
>         transformedPosition.vy += GsWSMATRIX.t[1];
>         transformedPosition.vz += GsWSMATRIX.t[2];
> 
> That would make a big difference!
> 
> Let me know if it works, this code would be a useful addition to the FAQ.
> 
> Cheers,
> 
> James
> 
> --
> == James_Russell@scee.sony.co.uk                +44 (171) 447-1626
> == Developer Support Engineer - Sony Computer Entertainment Europe
> 
> Easter is canceled this year.  They've found the body.

Ahhhhh, I knew there was something missing because I couldn't figure out
the purpose
in applying an empty matrix.

I'll try it out and let you know if it works. Thanks mate - you da man!
-- 
Regards  |  E-mail: hc054@mdx.ac.uk
Harvey   |  ICQ: 4269478