Path: chuka.playstation.co.uk!news
From: will atkin <william_atkin@hotmail.com>
Newsgroups: scee.yaroze.programming.3d_graphics
Subject: Re: more 3d problems..
Date: Tue, 27 Apr 1999 17:45:28 +0100
Organization: PlayStation Net Yaroze (SCEE)
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Message-ID: <3725E9A8.7CE7102A@hotmail.com>
References: <3721F00A.D31147E8@bournemouth.ac.uk> <7g243s$7352@chuka.playstation.co.uk>
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>
>
> void draw_3dsprite (GsSPRITE *sprite,VECTOR spritePosition) {
>     // The spritePosition is the point in 3D space (world coords) that your
> sprite lies at.
>
>     VECTOR transformedPosition;
>     extern MATRIX GsWSMATRIX;
>
>     ApplyMatrixLV(&GsWSMATRIX,&spritePosition,&transformedPosition);
>     transformedPosition.vx += GsWSMATRIX.t[0];
>     transformedPosition.vy += GsWSMATRIX.t[1];
>     transformedPosition.vz += GsWSMATRIX.t[2];
>
>     if (transformedPosition.vz>0) {    // Only draw sprite if it's in front
> of the camera.
>             // Scales the sprite according to the distance.
>         sprite->scalex = sprite->scaley = (ONE << 12) /
> transformedPosition.vz;
>         sprite->x = transformedPosition.vx * PROJECTION_DISTANCE /
> transformedPosition.vz;
>         sprite->y = transformedPosition.vy * PROJECTION_DISTANCE /
> transformedPosition.vz;
>
> GsSortSprite(&sprite,&OTable_Header[GsGetActiveBuffer()],transformedPosition
> .vz >> (14 - ORDERING_TABLE_LENGTH));
>     }
> }
>
> Rikki

Thanks for the tip... we'll try it out!

Will