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Perlin Noise Problems

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I am havin problems with my noise function. I am getting a sort of pattern that emerges. This is the code I am using. float PerlinNoise::Noise(float x, float y) { int n = x + y * 17; n = (n<<13)^n; return ( 1.000 - ( (n * (n * n * 15731 + 789221) +1376312589) & 0x7FFFFFFF) / 1073741824.0); } are there any problems. An help is appreciated. Sagar Indurkhya

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