Path: chuka.playstation.co.uk!news
From: James Russell <James_Russell@scee.sony.co.uk>
Newsgroups: scee.yaroze.programming.3d_graphics
Subject: Re: 2d sprites in a 3d world
Date: Sun, 29 Nov 1998 13:57:40 +0000
Organization: Sony Computer Entertainment Europe
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"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.