CODEWITHSUNDEEP
randomnumbersrandom-seednoise-generator
Thiago
Thiago

Reputation: 471

Seeded Pseudo Random Number Generator

I am developing a Perlin Noise generator which works based on a seed integer and on two other integers: x and y.

By now, the pseudo-random number generator is looking like this:

private float noise(int x, int y) {     

    int n = x + y * seed;
    return (1.0f - ((n * (n * n * 15731 + 789221) + 1376312589) & 0x7fffffff) / 1073741824f);

}

But there are some problems with this implementation: first of all, the return interval is not constant (ideally, I would like to work with [-1, 1] or [0, 1]) and for negative x and y values, the pattern gets blocky, not looking organic at all. Is there a way to change my formula (or maybe a totally new one) which would make it fit my needs?

Upvotes: 1

Views: 626

Answers (1)

Frank
Frank

Reputation: 15641

I use this one (i found it on the net, but i don't have the original link anymore):

private double noise(int x, int y) {
    int n=(int)x*331+(int)y*337; // add your seed on this line.
    n=(n<<13)^n;
    int nn=(n*(n*n*41333 +53307781)+1376312589)&0x7fffffff;       
    return ((1.0-((double)nn/1073741824.0))+1)/2.0;

}

You can easy add your seed to it.

Upvotes: 1

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