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103 lines
3.4 KiB
Python
103 lines
3.4 KiB
Python
#
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# A python perlin noise implementation, from
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# http://www.fundza.com/c4serious/noise/perlin/perlin.html
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#
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# This is used for testing how to create maps with a python script.
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#
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import math
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p = (
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151,160,137,91,90,15,131,13,201,95,96,53,194,233,7,225,140,36,103,
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30,69,142,8,99,37,240,21,10,23,190,6,148,247,120,234,75,0,26,197,
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62,94,252,219,203,117,35,11,32,57,177,33,88,237,149,56,87,174,20,
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125,136,171,168,68,175,74,165,71,134,139,48,27,166,77,146,158,231,
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83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,102,
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143,54,65,25,63,161,1,216,80,73,209,76,132,187,208,89,18,169,200,
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196,135,130,116,188,159,86,164,100,109,198,173,186,3,64,52,217,226,
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250,124,123,5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,
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58,17,182,189,28,42,223,183,170,213,119,248,152,2,44,154,163,70,
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221,153,101,155,167,43,172,9,129,22,39,253,19,98,108,110,79,113,
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224,232,178,185,112,104,218,246,97,228,251,34,242,193,238,210,144,
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12,191,179,162,241,81,51,145,235,249,14,239,107,49,192,214,31,181,
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199,106,157,184,84,204,176,115,121,50,45,127,4,150,254,138,236,
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205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180,
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151,160,137,91,90,15,131,13,201,95,96,53,194,233,7,225,140,36,103,
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30,69,142,8,99,37,240,21,10,23,190,6,148,247,120,234,75,0,26,197,
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62,94,252,219,203,117,35,11,32,57,177,33,88,237,149,56,87,174,20,
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125,136,171,168,68,175,74,165,71,134,139,48,27,166,77,146,158,231,
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83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,102,
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143,54,65,25,63,161,1,216,80,73,209,76,132,187,208,89,18,169,200,
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196,135,130,116,188,159,86,164,100,109,198,173,186,3,64,52,217,226,
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250,124,123,5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,
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58,17,182,189,28,42,223,183,170,213,119,248,152,2,44,154,163,70,
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221,153,101,155,167,43,172,9,129,22,39,253,19,98,108,110,79,113,
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224,232,178,185,112,104,218,246,97,228,251,34,242,193,238,210,144,
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12,191,179,162,241,81,51,145,235,249,14,239,107,49,192,214,31,181,
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199,106,157,184,84,204,176,115,121,50,45,127,4,150,254,138,236,
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205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180)
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def lerp(t, a, b):
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return a + t * (b - a)
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def fade(t):
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return t * t * t * (t * (t * 6 - 15) + 10)
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def grad(hash, x, y, z):
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h = hash & 15
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if h < 8:
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u = x
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else:
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u = y
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if h < 4:
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v = y
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elif h == 12 or h == 14:
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v = x
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else:
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v = z
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if h & 1 != 0:
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u = -u
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if h & 2 != 0:
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v = -v
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return u + v
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def pnoise(x, y, z):
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global p
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X = int(math.floor(x)) & 255
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Y = int(math.floor(y)) & 255
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Z = int(math.floor(z)) & 255
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x -= math.floor(x)
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y -= math.floor(y)
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z -= math.floor(z)
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u = fade(x)
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v = fade(y)
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w = fade(z)
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A = p[X] + Y
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AA = p[A] + Z
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AB = p[A + 1] + Z
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B = p[X + 1] + Y
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BA = p[B] + Z
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BB = p[B + 1] + Z
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pAA = p[AA]
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pAB = p[AB]
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pBA = p[BA]
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pBB = p[BB]
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pAA1 = p[AA + 1]
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pBA1 = p[BA + 1]
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pAB1 = p[AB + 1]
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pBB1 = p[BB + 1]
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gradAA = grad(pAA, x, y, z)
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gradBA = grad(pBA, x-1, y, z)
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gradAB = grad(pAB, x, y-1, z)
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gradBB = grad(pBB, x-1, y-1, z)
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gradAA1 = grad(pAA1,x, y, z-1)
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gradBA1 = grad(pBA1,x-1, y, z-1)
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gradAB1 = grad(pAB1,x, y-1, z-1)
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gradBB1 = grad(pBB1,x-1, y-1, z-1)
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return lerp(w,
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lerp(v, lerp(u, gradAA, gradBA), lerp(u, gradAB, gradBB)),
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lerp(v, lerp(u, gradAA1,gradBA1),lerp(u, gradAB1,gradBB1)))
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