Perlin noise: Difference between revisions
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Thundergnat (talk | contribs) m (Promote to task, lots of examples, little controversy, add note about expected accuracy) |
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{{out}} |
{{out}} |
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0.13691995878400012 |
0.13691995878400012 |
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=={{header|Wren}}== |
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{{trans|Kotlin}} |
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<lang ecmascript>var permutation = [ |
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151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225, |
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140, 36, 103, 30, 69, 142, 8, 99, 37, 240, 21, 10, 23, 190, 6, 148, |
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247, 120, 234, 75, 0, 26, 197, 62, 94, 252, 219, 203, 117, 35, 11, 32, |
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57, 177, 33, 88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175, |
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74, 165, 71, 134, 139, 48, 27, 166, 77, 146, 158, 231, 83, 111, 229, 122, |
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60, 211, 133, 230, 220, 105, 92, 41, 55, 46, 245, 40, 244, 102, 143, 54, |
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65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169, |
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200, 196, 135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64, |
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52, 217, 226, 250, 124, 123, 5, 202, 38, 147, 118, 126, 255, 82, 85, 212, |
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207, 206, 59, 227, 47, 16, 58, 17, 182, 189, 28, 42, 223, 183, 170, 213, |
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119, 248, 152, 2, 44, 154, 163, 70, 221, 153, 101, 155, 167, 43, 172, 9, |
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129, 22, 39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178, 185, 112, 104, |
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218, 246, 97, 228, 251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162, 241, |
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81, 51, 145, 235, 249, 14, 239, 107, 49, 192, 214, 31, 181, 199, 106, 157, |
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184, 84, 204, 176, 115, 121, 50, 45, 127, 4, 150, 254, 138, 236, 205, 93, |
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222, 114, 67, 29, 24, 72, 243, 141, 128, 195, 78, 66, 215, 61, 156, 180 |
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] |
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var p = (0...512).map { |i| (i < 256) ? permutation[i] : permutation[i-256] }.toList |
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var fade = Fn.new { |t| t * t * t * (t * (t * 6 - 15) + 10) } |
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var lerp = Fn.new { |t, a, b| a + t * (b - a) } |
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var grad = Fn.new { |hash, x, y, z| |
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// Convert low 4 bits of hash code into 12 gradient directions |
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var h = hash & 15 |
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var u = (h < 8) ? x : y |
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var v = (h < 4) ? y : (h == 12 || h == 14) ? x : z |
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return (((h & 1) == 0) ? u : -u) + (((h & 2) == 0) ? v : -v) |
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} |
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var noise = Fn.new { |x, y, z| |
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// Find unit cube that contains point |
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var xi = x.floor & 255 |
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var yi = y.floor & 255 |
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var zi = z.floor & 255 |
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// Find relative x, y, z of point in cube |
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var xx = x.fraction |
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var yy = y.fraction |
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var zz = z.fraction |
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// Compute fade curves for each of xx, yy, zz |
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var u = fade.call(xx) |
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var v = fade.call(yy) |
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var w = fade.call(zz) |
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// Hash co-ordinates of the 8 cube corners |
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// and add blended results from 8 corners of cube |
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var a = p[xi] + yi |
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var aa = p[a] + zi |
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var ab = p[a + 1] + zi |
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var b = p[xi + 1] + yi |
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var ba = p[b] + zi |
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var bb = p[b + 1] + zi |
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return lerp.call(w, |
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lerp.call(v, lerp.call(u, grad.call(p[aa], xx, yy, zz), grad.call(p[ba], xx - 1, yy, zz)), |
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lerp.call(u, grad.call(p[ab], xx, yy - 1, zz), grad.call(p[bb], xx - 1, yy - 1, zz))), |
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lerp.call(v, lerp.call(u, grad.call(p[aa + 1], xx, yy, zz - 1), grad.call(p[ba + 1], xx - 1, yy, zz - 1)), |
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lerp.call(u, grad.call(p[ab + 1], xx, yy - 1, zz - 1), grad.call(p[bb + 1], xx - 1, yy - 1, zz - 1))) |
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) |
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} |
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System.print(noise.call(3.14, 42, 7))</lang> |
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{{out}} |
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<pre> |
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0.136919958784 |
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</pre> |
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=={{header|zkl}}== |
=={{header|zkl}}== |