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POPerlin Noise not working
 

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  1. POPerlin Noise not working
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    <p>I have a bit of an issue (again) with my Perlin Noise generation. I have read multiple articles on how it works. I implemented it with the following code:</p> <pre><code>package PerlinNoise; import java.util.Random; public class PerlinNoise { private long seed; private Random rand; private float f; public PerlinNoise(long seed, float f) { this.seed = seed; this.f = f; rand = new Random(); } //interpolates generated noise public float getInterpolatedNoise(float x, float y) { float a = (int) Math.floor((double) x / f); float A = a + 1; float b = (int) Math.floor((double) y / f); //&lt;-- define the points around the point float B = b + 1; return cosineInterpolate( cosineInterpolate((float) getNoise(a, b), (float) getNoise(A, b), (float) (x - a * f) / f), cosineInterpolate((float) getNoise(a, B), (float) getNoise(A, B), (float) (x - a * f) / f), (float) (y - b * f) / f); //&lt;-- interpolates everything } //cosine interpolation private float cosineInterpolate(float a, float b, float x) { float f = (float) ((1f - Math.cos(x * Math.PI)) * .5f); return a * (1f - f) + b * f; } //generates random noise value between -1.0 and 1.0 private float getNoise(float x, float y) { if(y &lt; 0) { rand.setSeed((long) (332423 * (Math.sin(Math.cos(x) * x) + Math.cos(Math.sin(y) * y) + Math.tan(seed)))); }else{ rand.setSeed((long) (432423 * (Math.sin(x) + Math.cos(y) + Math.tan(seed)))); } float n = (float)(((float)rand.nextInt(255) - (float)rand.nextInt(255)) / 255.0f); return n; } </code></pre> <p>And here is when I add all my octaves together:</p> <pre><code> //performs perlin noise function public static float[][] getPerlinNoise(int octaves, long seed) { float[][] noise = new float[Main.csX][Main.csY]; for(int z = 0; z &lt; octaves; z++) { float f = (float)Math.pow(2, z); PerlinNoise oct = new PerlinNoise(seed, f); for(int y = 0; y &lt; Main.csY; y++) { for(int x = 0; x &lt; Main.csX; x++) { noise[x][y] = (noise[x][y] + oct.getInterpolatedNoise(x * f, y * f)) * (float)Math.pow(p, z); //&lt;- pumps out numbers between -1.0 and 1.0 } } } return noise; } </code></pre> <p>Sorry for the giant code dump there. The code all works when I run it, but I don't get Perlin noise. I just get this:</p> <p><img src="https://i.stack.imgur.com/iTq3U.png" alt="Definitely not Perlin Noise.."></p> <p>This is more of blury, blended noise than anything else. I get very similar results even when I add more octaves and/or ramp up the persistence. I used <a href="http://freespace.virgin.net/hugo.elias/models/m_perlin.htm" rel="nofollow noreferrer">this</a> article as a reference for building the code (and also <a href="http://webstaff.itn.liu.se/~stegu/TNM022-2005/perlinnoiselinks/perlin-noise-math-faq.html" rel="nofollow noreferrer">this</a> one). So if anyone has any ideas as to why this isn't working, please comment/answer. Thanks!</p>
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    1. USCoderTheTyler
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    1. COFor better help sooner, post an [SSCCE](http://sscce.org/).
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    2. COno.. i think I'll just wait for a response. Thanks though
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    3. COOr hope for a respone :D
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