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