Perlin noise: Difference between revisions
julia example
(→{{header|Go}}: added GLSL) |
(julia example) |
||
Line 662:
static { for (int i=0; i < 256 ; i++) p[256+i] = p[i] = permutation[i]; }
}</lang>
=={{header|Julia}}==
<lang julia>const permutation = UInt8[
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]
function grad(h::Integer, x, y, z)
h &= 15 # CONVERT LO 4 BITS OF HASH CODE
u = h < 8 ? x : y # INTO 12 GRADIENT DIRECTIONS.
v = h < 4 ? y : h == 12 || h == 14 ? x : z
(h & 1 == 0 ? u : -u) + (h & 2 == 0 ? v : -v)
end
function perlinsnoise(x, y, z)
p = vcat(permutation, permutation)
fade(t) = t * t * t * (t * (t * 6 - 15) + 10)
lerp(t, a, b) = a + t * (b - a)
floorb(x) = Int(floor(x)) & 0xff
X, Y, Z = floorb(x), floorb(y), floorb(z) # FIND UNIT CUBE THAT CONTAINS POINT.
x, y, z = x - floor(x), y - floor(y), z - floor(z) # FIND RELATIVE X,Y,Z OF POINT IN CUBE.
u, v, w = fade(x), fade(y), fade(z) # COMPUTE FADE CURVES FOR EACH OF X,Y,Z.
A = p[X + 1] + Y; AA = p[A + 1] + Z; AB = p[A + 2] + Z
B = p[X + 2] + Y; BA = p[B + 1] + Z; BB = p[B + 2] + Z # HASH COORDINATES OF THE 8 CUBE CORNERS
return lerp(w, lerp(v, lerp(u, grad(p[AA + 1], x , y , z ), # AND ADD
grad(p[BA + 1], x - 1, y , z )), # BLENDED
lerp(u, grad(p[AB + 1], x , y - 1, z ), # RESULTS
grad(p[BB + 1], x - 1, y - 1, z ))), # FROM 8
lerp(v, lerp(u, grad(p[AA + 2], x , y , z - 1 ), # CORNERS
grad(p[BA + 2], x - 1, y , z - 1)), # OF CUBE.
lerp(u, grad(p[AB + 2], x , y - 1, z - 1 ),
grad(p[BB + 2], x - 1, y - 1, z - 1))))
end
x = perlinsnoise(3.14, 42.0, 7.0)
println("Perlin noise applied to (3.14, 42.0, 7.0) gives ", x)
</lang>{{out}}
<pre>
Perlin noise applied to (3.14, 42.0, 7.0) gives 0.13691995878400012
</pre>
=={{header|Kotlin}}==
| |||