Path: chuka.playstation.co.uk!news
From: "Matt Verran" <mverran@btinternet.com>
Newsgroups: scee.yaroze.freetalk.english
Subject: Re: Matrix
Date: Mon, 30 Jul 2001 16:23:48 +0100
Organization: PlayStation Net Yaroze (SCEE)
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Message-ID: <9k3u6h$6qb4@www.netyaroze-europe.com>
References: <9k3qu6$6qb1@www.netyaroze-europe.com>
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No you don't need to call GsInit3D to use the matrix stuff.

Here's a function I use instead of sin/cos or lookups:

int RotPosX(int size, int r)
  {
  MATRIX matTmp;
  SVECTOR startVector;
  SVECTOR rotateVector;

  startVector.vx = size;   startVector.vy = 0;   startVector.vz = 0;
  rotateVector.vx = 0;     rotateVector.vy = 0;  rotateVector.vz = r;

  RotMatrix(&rotateVector, &matTmp);
  ApplyMatrixSV(&matTmp, &startVector, &rotateVector);

  return rotateVector.vx;
  }

(NB:  the 'r' parameter 4096=360 degrees)


to do:
X = 60 * Sin(90)

using my function:
X = RotPosX(60, 1024)

Basically the function rotates the startVector about the Z axis (so it's X
and Y values are changed), only the X value is returned, but the Y value is
just the same shifted 90 (1024) degrees, just like sin/cos.

No problem giving further help, just ask...
MattV



Nigel Critten <Nigel@gameware.demon.co.uk> wrote in message
news:9k3qu6$6qb1@www.netyaroze-europe.com...
> I've been looking at my highscore name entry and its a bit boring, being
> based on one I did back in 94 :) so I want to make it look flash, at the
> moment I'm using a lookup table, If you look back you will find a thread
on
> Floating Points that was in March and I've been using a lookup since then
> meaning to get into Matrix stuff but never getting round to.
>
> But this is the time, Matt V if you can hear me help... you gave a good
> explanation back then but I need more help :)
>
> Right basic stuff first, do I need to GsInit3D, there is no mention in the
> manual that I can see that needs Init3D for the Matrix stuff?
>
> Are there any nice demos about showing off the basics of this stuff.
>
> Cheers
> Nigel
>
>