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Perlin noise: Difference between revisions
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=={{header|Swift}}==
<lang swift>import Foundation
struct Perlin {
private static let 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
]
private static let p = (0..<512).map({i -> Int in
if i < 256 {
return permutation[i]
} else {
return permutation[i - 256]
}
})
private static func fade(_ t: Double) -> Double { t * t * t * (t * (t * 6 - 15) + 10) }
private static func lerp(_ t: Double, _ a: Double, _ b: Double) -> Double { a + t * (b - a) }
private static func grad(_ hash: Int, _ x: Double, _ y: Double, _ z: Double) -> Double {
let h = hash & 15
let u = h < 8 ? x : y
let v = h < 4 ? y : h == 12 || h == 14 ? x : z
return (h & 1 == 0 ? u : -u) + (h & 2 == 0 ? v : -v)
}
static func noise(x: Double, y: Double, z: Double) -> Double {
let xi = Int(x) & 255
let yi = Int(y) & 255
let zi = Int(z) & 255
let xx = x - floor(x)
let yy = y - floor(y)
let zz = z - floor(z)
let u = fade(xx)
let v = fade(yy)
let w = fade(zz)
let a = p[xi] + yi
let aa = p[a] + zi
let b = p[xi + 1] + yi
let ba = p[b] + zi
let ab = p[a + 1] + zi
let bb = p[b + 1] + zi
return lerp(w, lerp(v, lerp(u, grad(p[aa], xx, yy, zz),
grad(p[ba], xx - 1, yy, zz)),
lerp(u, grad(p[ab], xx, yy - 1, zz),
grad(p[bb], xx - 1, yy - 1, zz))),
lerp(v, lerp(u, grad(p[aa + 1], xx, yy, zz - 1),
grad(p[ba + 1], xx - 1, yy, zz - 1)),
lerp(u, grad(p[ab + 1], xx, yy - 1, zz - 1),
grad(p[bb + 1], xx - 1, yy - 1, zz - 1))))
}
}
print(Perlin.noise(x: 3.14, y: 42, z: 7))</lang>
{{out}}
<pre>0.13691995878400012</pre>
=={{header|Tcl}}==
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