Re: r

[Alan Jones <skyphyr(at)gmail.com>]

Thanks, but this is for expressions. If anyone's curious how to do it
with JScript here's an ugly function that breaks easily. Apply this as
a scripted event to your particle and it'll rotate it to a random
direction based on its ID.

function NextRandomNumber()  {
  var hi   = this.seed / this.Q;
  var lo   = this.seed % this.Q;
  var test = this.A * lo - this.R * hi;
  if (test > 0)
    this.seed = test;
  else
    this.seed = test + this.M;
  return (this.seed * this.oneOverM);
}

function RandomNumberGenerator(seed) {
  var d = new Date();
  this.seed = 2345678901 +
    (seed * 0xFFFFFF);
  this.A = 48271;
  this.M = 2147483647;
  this.Q = this.M / this.A;
  this.R = this.M % this.A;
  this.oneOverM = 1.0 / this.M;
  this.next = NextRandomNumber;
  return this;
}

function random(lrn, urn) {
  // Random LowerRange Number (lrn)
  // Random UpperRange Number (urn)
  // return Math.round((urn - lrn + 1) * rand.next() + lrn);
  return Math.floor((urn - lrn + 1) * rand.next() + lrn);
}

var rand = new RandomNumberGenerator(inParticle.ID);

var xNum = random(-60, 60);
var zNum = random(-60, 60);

var v1 = XSIMath.CreateVector3();
v1.x = xNum + inParticle.Rotation.X;
v1.y = inParticle.Rotation.Y;
v1.z = zNum + inParticle.Rotation.Z;
inParticle.Rotation = v1;

Cheers,

Alan.

On 7/21/05, Nils Koesters <nils(at)mcs.st-and.ac.uk> wrote:
> The XSI help file says
> 
> randBool(17)
> 
> Generates a random number between 0.0 and 1.0 at each frame. The sequence
> is the same each time you play the scene back.
> 
> 
> Dunno if that helps.
> 
> Otherwise just generate them for your frame once somewhere, store them and
> reuse them.
> 
> Regards
> Nils
> 
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