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using UnityEngine; |
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using System.Collections; |
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public class SimplexNoiseGenerator { |
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private int[] A = new int[3]; |
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private float s, u, v, w; |
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private int i, j, k; |
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private float onethird = 0.333333333f; |
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private float onesixth = 0.166666667f; |
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private int[] T; |
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public SimplexNoiseGenerator() { |
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if (T == null) { |
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System.Random rand = new System.Random(); |
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T = new int[8]; |
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for (int q = 0; q < 8; q++) |
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T[q] = rand.Next(); |
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} |
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} |
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public SimplexNoiseGenerator(string seed) { |
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T = new int[8]; |
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string[] seed_parts = seed.Split(new char[] {' '}); |
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for(int q = 0; q < 8; q++) { |
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int b; |
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try { |
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b = int.Parse(seed_parts[q]); |
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} catch { |
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b = 0x0; |
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} |
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T[q] = b; |
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} |
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} |
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public SimplexNoiseGenerator(int[] seed) { // {0x16, 0x38, 0x32, 0x2c, 0x0d, 0x13, 0x07, 0x2a} |
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T = seed; |
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} |
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public string GetSeed() { |
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string seed = ""; |
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for(int q=0; q < 8; q++) { |
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seed += T[q].ToString(); |
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if(q < 7) |
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seed += " "; |
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} |
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return seed; |
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} |
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public float coherentNoise(float x, float y, float z, int octaves=1, int multiplier = 25, float amplitude = 0.5f, float lacunarity = 2, float persistence = 0.9f) { |
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Vector3 v3 = new Vector3(x,y,z)/multiplier; |
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float val = 0; |
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for (int n = 0; n < octaves; n++) { |
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val += noise(v3.x,v3.y,v3.z) * amplitude; |
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v3 *= lacunarity; |
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amplitude *= persistence; |
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} |
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return val; |
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} |
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public int getDensity(Vector3 loc) { |
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float val = coherentNoise(loc.x, loc.y, loc.z); |
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return (int)Mathf.Lerp(0,255,val); |
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} |
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// Simplex Noise Generator |
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public float noise(float x, float y, float z) { |
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s = (x + y + z) * onethird; |
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i = fastfloor(x + s); |
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j = fastfloor(y + s); |
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k = fastfloor(z + s); |
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s = (i + j + k) * onesixth; |
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u = x - i + s; |
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v = y - j + s; |
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w = z - k + s; |
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A[0] = 0; A[1] = 0; A[2] = 0; |
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int hi = u >= w ? u >= v ? 0 : 1 : v >= w ? 1 : 2; |
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int lo = u < w ? u < v ? 0 : 1 : v < w ? 1 : 2; |
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return kay(hi) + kay(3 - hi - lo) + kay(lo) + kay(0); |
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} |
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float kay(int a) { |
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s = (A[0] + A[1] + A[2]) * onesixth; |
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float x = u - A[0] + s; |
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float y = v - A[1] + s; |
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float z = w - A[2] + s; |
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float t = 0.6f - x * x - y * y - z * z; |
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int h = shuffle(i + A[0], j + A[1], k + A[2]); |
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A[a]++; |
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if (t < 0) return 0; |
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int b5 = h >> 5 & 1; |
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int b4 = h >> 4 & 1; |
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int b3 = h >> 3 & 1; |
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int b2 = h >> 2 & 1; |
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int b1 = h & 3; |
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float p = b1 == 1 ? x : b1 == 2 ? y : z; |
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float q = b1 == 1 ? y : b1 == 2 ? z : x; |
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float r = b1 == 1 ? z : b1 == 2 ? x : y; |
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p = b5 == b3 ? -p : p; |
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q = b5 == b4 ? -q : q; |
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r = b5 != (b4 ^ b3) ? -r : r; |
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t *= t; |
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return 8 * t * t * (p + (b1 == 0 ? q + r : b2 == 0 ? q : r)); |
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} |
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int shuffle(int i, int j, int k) { |
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return b(i, j, k, 0) + b(j, k, i, 1) + b(k, i, j, 2) + b(i, j, k, 3) + b(j, k, i, 4) + b(k, i, j, 5) + b(i, j, k, 6) + b(j, k, i, 7); |
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} |
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int b(int i, int j, int k, int B) { |
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return T[b(i, B) << 2 | b(j, B) << 1 | b(k, B)]; |
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} |
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int b(int N, int B) { |
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return N >> B & 1; |
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} |
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int fastfloor(float n) { |
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return n > 0 ? (int)n : (int)n - 1; |
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} |
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} |
jstanden created this gist