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// http://mrl.nyu.edu/~perlin/noise/ | |
(function(){ | |
window.perlin = function(x, y, z){ | |
var floorX = Math.floor(x), floorY = Math.floor(y), floorZ = Math.floor(z); | |
var X = floorX & 255, Y = floorY & 255, Z = floorZ & 255; | |
x -= floorX; | |
y -= floorY; | |
z -= floorZ; | |
var xMinus1 = x -1, yMinus1 = y - 1, zMinus1 = z - 1; | |
var u = perlin.fade(x), v = perlin.fade(y), w = perlin.fade(z); | |
var A = perlin.p[X]+Y, AA = perlin.p[A]+Z, AB = perlin.p[A+1]+Z, B = perlin.p[X+1]+Y, BA = perlin.p[B]+Z, BB = perlin.p[B+1]+Z; | |
return perlin.lerp(w, perlin.lerp(v, perlin.lerp(u, perlin.grad(perlin.p[AA], x, y, z), | |
perlin.grad(perlin.p[BA], xMinus1, y, z)), | |
perlin.lerp(u, perlin.grad(perlin.p[AB], x, yMinus1, z), | |
perlin.grad(perlin.p[BB], xMinus1, yMinus1, z))), | |
perlin.lerp(v, perlin.lerp(u, perlin.grad(perlin.p[AA+1], x, y, zMinus1), | |
perlin.grad(perlin.p[BA+1], xMinus1, y, z-1)), | |
perlin.lerp(u, perlin.grad(perlin.p[AB+1], x, yMinus1, zMinus1), | |
perlin.grad(perlin.p[BB+1], xMinus1, yMinus1, zMinus1)))); | |
} | |
perlin.fade = function(t){ | |
return t * t * t * (t * (t * 6 - 15) + 10); | |
}; | |
perlin.lerp = function(t, a, b){ | |
return a + t * (b - a); | |
}; | |
perlin.grad = function(hash, x, y, z){ | |
var h = hash & 15; | |
var u = h < 8 ? x : y, v = h < 4 ? y : h == 12 || h == 14 ? x : z; | |
return ((h&1) == 0 ? u : -u) + ((h&2) == 0 ? v : -v); | |
}; | |
perlin.p = [ | |
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 | |
]; | |
for (var i=0; i < 256 ; i++) { | |
window.perlin.p[256 + i] = window.perlin.p[i]; | |
} | |
})(); |
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