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noise.js
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noise.js
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var perlin3 = function () {
function G(x, y, z) {
this.x = x
this.y = y
this.z = z
}
G.prototype.dot3 = function (x, y, z) {
return this.x * x + this.y * y + this.z * z }
var grad3 = [
new G(1, 1, 0), new G(-1, 1, 0), new G(1, -1, 0), new G(-1, -1, 0),
new G(1, 0, 1), new G(-1, 0, 1), new G(1, 0, -1), new G(-1, 0, -1),
new G(0, 1, 1), new G(0, -1, 1), new G(0, 1, -1), new G(0, -1, -1)]
var 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]
var pr = Array(512), gp = Array(512)
function _seed(seed) {
if (seed < 256)
seed |= seed << 8
var seed2 = seed >> 8
var i, k
for (i = 0; i < 256; ++i) {
k = p[i] ^ ((i & 1? seed: seed2) & 255)
pr[i] = pr[i + 256] = k
gp[i] = gp[i + 256] = grad3[k % 12]
}
}
_seed(0|Math.random() * (1 << 16))
function _fade(t) { return t * t * t * (t * (t * 6 - 15) + 10) }
function _lerp(a, b, t) { return (1 - t) * a + t * b }
return function (x, y, z) {
var X = Math.floor(x),
Y = Math.floor(y),
Z = Math.floor(z)
x -= X
y -= Y
z -= Z
X &= 255
Y &= 255
Z &= 255
var n000 = gp[X + pr[Y + pr[Z ]]].dot3(x , y , z );
var n001 = gp[X + pr[Y + pr[Z + 1]]].dot3(x , y , z - 1);
var n010 = gp[X + pr[Y + 1 + pr[Z ]]].dot3(x , y - 1, z );
var n011 = gp[X + pr[Y + 1 + pr[Z + 1]]].dot3(x , y - 1, z - 1);
var n100 = gp[X + 1 + pr[Y + pr[Z ]]].dot3(x - 1, y , z );
var n101 = gp[X + 1 + pr[Y + pr[Z + 1]]].dot3(x - 1, y , z - 1);
var n110 = gp[X + 1 + pr[Y + 1 + pr[Z ]]].dot3(x - 1, y - 1, z );
var n111 = gp[X + 1 + pr[Y + 1 + pr[Z + 1]]].dot3(x - 1, y - 1, z - 1);
var u = _fade(x)
var v = _fade(y)
var w = _fade(z)
return _lerp(
_lerp(
_lerp(n000, n100, u),
_lerp(n001, n101, u), w),
_lerp(
_lerp(n010, n110, u),
_lerp(n011, n111, u), w),
v)
}
}()