94 lines
3.2 KiB
C#
94 lines
3.2 KiB
C#
using UnityEngine;
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public static class PerlinNoise3D
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{
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private static int[] permutation;
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private static int[] p;
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static PerlinNoise3D()
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{
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permutation = new int[256]
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{
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151, 160, 137, 91, 90, 15, 131, 13, 201, 95,
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96, 53, 194, 233, 7, 225, 140, 36, 103, 30,
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69, 142, 8, 99, 37, 240, 21, 10, 23, 190,
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6, 148, 247, 120, 234, 75, 0, 26, 197, 62,
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94, 252, 219, 203, 117, 35, 11, 32, 57, 177,
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33, 88, 237, 149, 56, 87, 174, 20, 125, 136,
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171, 168, 68, 175, 74, 165, 71, 134, 139, 48,
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27, 166, 77, 146, 158, 231, 83, 111, 229, 122,
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60, 211, 133, 230, 220, 105, 92, 41, 55, 46,
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245, 40, 244, 102, 143, 54, 65, 25, 63, 161,
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1, 216, 80, 73, 209, 76, 132, 187, 208, 89,
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18, 169, 200, 196, 135, 130, 116, 188, 159, 86,
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164, 100, 109, 198, 173, 186, 3, 64, 52, 217,
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226, 250, 124, 123, 5, 202, 38, 147, 118, 126,
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255, 82, 85, 212, 207, 206, 59, 227, 47, 16,
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58, 17, 182, 189, 28, 42, 223, 183, 170, 213,
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119, 248, 152, 2, 44, 154, 163, 70, 221, 153,
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101, 155, 167, 43, 172, 9, 129, 22, 39, 253,
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19, 98, 108, 110, 79, 113, 224, 232, 178, 185,
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112, 104, 218, 246, 97, 228, 251, 34, 242, 193,
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238, 210, 144, 12, 191, 179, 162, 241, 81, 51,
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145, 235, 249, 14, 239, 107, 49, 192, 214, 31,
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181, 199, 106, 157, 184, 84, 204, 176, 115, 121,
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50, 45, 127, 4, 150, 254, 138, 236, 205, 93,
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222, 114, 67, 29, 24, 72, 243, 141, 128, 195,
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78, 66, 215, 61, 156, 180
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};
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p = new int[512];
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for (int i = 0; i < 512; i++)
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{
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p[i] = permutation[i % 256];
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}
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}
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public static float Perlin(float x, float y, float z)
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{
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int num = Mathf.FloorToInt(x) & 0xFF;
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int num2 = Mathf.FloorToInt(y) & 0xFF;
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int num3 = Mathf.FloorToInt(z) & 0xFF;
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float num4 = x - Mathf.Floor(x);
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float num5 = y - Mathf.Floor(y);
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float num6 = z - Mathf.Floor(z);
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float t = Fade(num4);
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float t2 = Fade(num5);
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float t3 = Fade(num6);
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int hash = p[p[p[num] + num2] + num3];
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int hash2 = p[p[p[num] + Inc(num2)] + num3];
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int hash3 = p[p[p[num] + num2] + Inc(num3)];
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int hash4 = p[p[p[num] + Inc(num2)] + Inc(num3)];
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int hash5 = p[p[p[Inc(num)] + num2] + num3];
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int hash6 = p[p[p[Inc(num)] + Inc(num2)] + num3];
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int hash7 = p[p[p[Inc(num)] + num2] + Inc(num3)];
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int hash8 = p[p[p[Inc(num)] + Inc(num2)] + Inc(num3)];
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float a = Mathf.Lerp(Grad(hash, num4, num5, num6), Grad(hash5, num4 - 1f, num5, num6), t);
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float b = Mathf.Lerp(Grad(hash2, num4, num5 - 1f, num6), Grad(hash6, num4 - 1f, num5 - 1f, num6), t);
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float a2 = Mathf.Lerp(a, b, t2);
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float a3 = Mathf.Lerp(Grad(hash3, num4, num5, num6 - 1f), Grad(hash7, num4 - 1f, num5, num6 - 1f), t);
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b = Mathf.Lerp(Grad(hash4, num4, num5 - 1f, num6 - 1f), Grad(hash8, num4 - 1f, num5 - 1f, num6 - 1f), t);
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float b2 = Mathf.Lerp(a3, b, t2);
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return (Mathf.Lerp(a2, b2, t3) + 1f) / 2f;
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}
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private static int Inc(int num)
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{
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num++;
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return num;
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}
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private static float Fade(float t)
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{
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return t * t * t * (t * (t * 6f - 15f) + 10f);
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}
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private static float Grad(int hash, float x, float y, float z)
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{
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int num = hash & 0xF;
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float num2 = ((num < 8) ? x : y);
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float num3 = ((num < 4) ? y : ((num == 12 || num == 14) ? x : z));
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return (((num & 1) == 0) ? num2 : (0f - num2)) + (((num & 2) == 0) ? num3 : (0f - num3));
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}
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}
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