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POSoftware Perlin noise implementation
 

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    <p>I have written a 2D Perlin noise implementation based on information from <a href="http://www.dreamincode.net/forums/topic/66480-perlin-noise/" rel="nofollow">here</a>, <a href="http://freespace.virgin.net/hugo.elias/models/m_perlin.htm" rel="nofollow">here</a>, <a href="http://www.codeproject.com/KB/recipes/SimpleRNG.aspx" rel="nofollow">here</a>, and <a href="http://mrl.nyu.edu/~perlin/doc/oscar.html#noise" rel="nofollow">here</a>. However, the output looks like <a href="http://dl.dropbox.com/u/14021598/Output.png" rel="nofollow">this</a>.</p> <pre><code>public static double Perlin(double X, double XScale, double Y, double YScale, double Persistance, double Octaves) { double total=0.0; for(int i=0;i&lt;Octaves;i++){ int frq = (int) Math.Pow(2,i); int amp = (int) Math.Pow(Persistance,i); total += InterpolatedSmoothNoise((X / XScale) * frq, (Y / YScale) * frq) * amp; } return total; } private static double InterpolatedSmoothNoise (double X, double Y) { int ix = (int) Math.Floor(X); double fx = X-ix; int iy = (int) Math.Floor(Y); double fy = Y-iy; double v1 = SmoothPerlin(ix,iy); // -- double v2 = SmoothPerlin(ix+1,iy); // +- double v3 = SmoothPerlin(ix,iy+1);// -+ double v4 = SmoothPerlin(ix+1,iy+1);// ++ double i1 = Interpolate(v1,v2,fx); double i2 = Interpolate(v3,v4,fx); return Interpolate(i1,i2,fy); } private static double SmoothPerlin (int X, int Y) { double sides=(Noise(X-1,Y,Z)+Noise(X+1,Y,Z)+Noise(X,Y-1,Z)+Noise(X,Y+1,Z)+Noise(X,Y,Z-1)+Noise(X,Y,Z+1))/12.0; double center=Noise(X,Y,Z)/2.0; return sides + center; } private static double Noise (int X, int Y) { uint m_z = (uint) (36969 * (X &amp; 65535) + (X &gt;&gt; 16)); uint m_w = (uint) (18000 * (Y &amp; 65535) + (Y &gt;&gt; 16)); uint ou = (m_z &lt;&lt; 16) + m_w; return ((ou + 1.0) * 2.328306435454494e-10); } </code></pre> <p>Any input on what is wrong is appreciated.</p> <p>EDIT: I found a way to solve this: I used an array of doubles generated at load to fix this. Any way to implement a good random number generator is appreciated though.</p>
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