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perlin: use wea.bit.band
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@ -58,9 +58,9 @@ end
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function Perlin:noise( x, y, z )
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y = y or 0
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z = z or 0
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local xi = self:BitAND(math.floor(x), 255)
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local yi = self:BitAND(math.floor(y), 255)
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local zi = self:BitAND(math.floor(z), 255)
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local xi = wea.bit.band(math.floor(x), 255)
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local yi = wea.bit.band(math.floor(y), 255)
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local zi = wea.bit.band(math.floor(z), 255)
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-- print("x", x, "y", y, "z", z, "xi", xi, "yi", yi, "zi", zi)
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-- print("p[xi]", self.p[xi])
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@ -109,17 +109,6 @@ function Perlin:noise( x, y, z )
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)
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end
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function Perlin:BitAND(a, b) --Bitwise and
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local p, c = 1, 0
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while a > 0 and b > 0 do
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local ra, rb = a%2, b%2
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if ra + rb > 1 then c = c + p end
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a, b, p = (a - ra) / 2, (b - rb) / 2, p * 2
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end
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return c
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end
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function Perlin:fade(t)
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return t * t * t * (t * (t * 6 - 15) + 10)
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end
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@ -129,7 +118,7 @@ function Perlin:lerp(t, a, b)
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end
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function Perlin:grad(hash, x, y, z)
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local h = self:BitAND(hash, 15)
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local h = wea.bit.band(hash, 15)
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local u = h < 8 and x or y
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local v = h < 4 and y or ((h == 12 or h == 14) and x or z)
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return ((h and 1) == 0 and u or - u) + ((h and 2) == 0 and v or - v)
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