Perlin noise: Difference between revisions
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</pre>
=={{header|M2000 Interpreter}}==
{{trans|Java}}
<syntaxhighlight lang="m2000 interpreter">
Group Perlin {
private:
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)
Public:
function noise(x, y, z) {
p=lambda a=.permutation (it)-> {
if it < 256 then =a#val(it) else =a#val(it - 256)
}
def fade(t)= t * t * t * (t * (t * 6 - 15) + 10)
def lerp(t, a, b) = a + t * (b - a)
function grad(hash, x, y, z) {
// Convert low 4 bits of hash code into 12 gradient directions
h = binary.and(hash, 15)
u = if(h < 8-> x, y)
v = if(h < 4-> y, if(h == 12 or h == 14->x, z))
=if(binary.and(h,1) = 0-> u, -u) + if(binary.and(h, 2) = 0-> v, -v)
}
// Find unit cube that contains point
xi = binary.and(floor(x), 255)
yi = binary.and(floor(y), 255)
zi = binary.and(floor(z), 255)
// Find relative x, y, z of point in cube
xx = x - floor(x)
yy = y - floor(y)
zz = z - floor(z)
// Compute fade curves for each of xx, yy, zz
u = fade(xx)
v = fade(yy)
w = fade(zz)
// Hash co-ordinates of the 8 cube corners
// and add blended results from 8 corners of cube
a = p(xi) + yi
aa = p(a) + zi
ab = p(a + 1) + zi
b = p(xi + 1) + yi
ba = p(b) + zi
bb = p(b + 1) + zi
=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(3.14, 42.0, 7.0)
</syntaxhighlight>
{{out}}
<pre>
0.136919958784
</pre>
=={{header|Lua}}==
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