[DGD] Damage Weapons and Stuff (Math and Code)

[White, Ben]

Well, you could just code them both up and find out...
But given you're not generating tens of thousands of them
per second, it's probably not going to matter too much.
So just pick the one you prefer...

-----Original Message-----
From: Ben Chambers [mailto:bjchamb at bellsouth.net]
Sent: Tuesday, 3 June 2003 11:56
To: dgd at list.imaginary.com
Subject: Re: [DGD] Damage Weapons and Stuff (Math and Code) 
> 
> 
> yeah, I was looking on line, this version is taken straight from that
> version but doesn't use the calls to cos/sin... which would 
> be slower...
> sin/cos or this version?
> 
> ----- Original Message -----
> From: "White, Ben" <ben.white at dsto.defence.gov.au>
> To: <dgd at list.imaginary.com>
> Sent: Monday, June 02, 2003 10:12 PM
> Subject: RE: [DGD] Damage Weapons and Stuff (Math and Code)
> 
> 
> > From: Ben Chambers [mailto:bjchamb at bellsouth.net]
> > >
> > > http://www.taygeta.com/random/gaussian.html
> > >
> > > The code found there follows:
> > >          float x1, x2, w, y1, y2;
> > >
> > >          do {
> > >                  x1 = 2.0 * ranf() - 1.0;
> > >                  x2 = 2.0 * ranf() - 1.0;
> > >                  w = x1 * x1 + x2 * x2;
> > >          } while ( w >= 1.0 );
> > >
> > >          w = sqrt( (-2.0 * ln( w ) ) / w );
> > >          y1 = x1 * w;
> > >          y2 = x2 * w;
> > >
> > > As the websites explains, ranf is a function to return a
> > > random number in
> > > the range [0, 1].  The problem is the number of calls that
> > > occur to ranf.
> > > There is the potential that a lot of calls would be made.
> > > How would DGD
> > > handle this?  How fast is the random generation function in DGD?
> > >
> >
> > The area of the square in which the number is being uniformly
> > generated is 4 (2 * 2).  The area of the circle in which the
> > numbers are chosen is 3.14159... (pi * r**2).  So you have a
> > better than 75% chance of getting your number first pop.
> > This does the same thing as one version I posted before, only
> > with the looping instead of a cos/sin...
> >
> > Ben.
> >
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