Perlin noise: Difference between revisions
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Perlin Noise for (3.14,42,7) is 0.1369199587840001
</pre>
=={{header|PureBasic}}==
{{trans|Pascal}}
<lang PureBasic>; Perlin_noise
; http://www.rosettacode.org
DataSection
STARTDATA:
Data.i 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
ENDDATA:
EndDataSection
Procedure.i p(index.i)
ProcedureReturn PeekI(?STARTDATA+SizeOf(Integer)*index)
EndProcedure
Procedure.d fade(t.d)
ProcedureReturn ((t*6-15)*t+10)*t*t*t
EndProcedure
Procedure.d lerp(t.d,a.d,b.d)
ProcedureReturn t*(b-a)+a
EndProcedure
Procedure.d grad(hash.i, x.d,y.d,z.d)
Select hash & 15
Case 0 : ProcedureReturn x+y
Case 1 : ProcedureReturn y-x
Case 2 : ProcedureReturn x-y
Case 3 : ProcedureReturn -x-y
Case 4 : ProcedureReturn x+z
Case 5 : ProcedureReturn z-x
Case 6 : ProcedureReturn x-z
Case 7 : ProcedureReturn -x-y
Case 8 : ProcedureReturn y+z
Case 9 : ProcedureReturn z-y
Case 10 : ProcedureReturn y-z
Case 11 : ProcedureReturn -y-z
Case 12 : ProcedureReturn x+y
Case 13 : ProcedureReturn z-y
Case 14 : ProcedureReturn y-x
Case 15 : ProcedureReturn -y-z
EndSelect
EndProcedure
Procedure.d noise(x.d,y.d,z.d)
Define.d u,v,w
Define.i a,b,c,A0,A1,A2,B0,B1,B2
a=Int(x)&255
b=Int(y)&255
c=Int(z)&255
x=x-IntQ(x)
y=y-IntQ(y)
z=z-IntQ(z)
u=fade(x)
v=fade(y)
w=fade(z)
A0=p(a)+b
A1=p(A0)+c
A2=p(A0+1)+c
B0=p(a+1)+b
B1=p(B0)+c
B2=p(B0+1)+c
ProcedureReturn lerp(w,lerp(v,lerp(u,grad(p(A1),x,y,z),
grad(p(B1),x-1,y,z)),
lerp(u,grad(p(A2),x,y-1,z),
grad(p(B2),x-1,y-1,z))),
lerp(v,lerp(u,grad(p(A1+1),x,y,z-1),
grad(p(B1+1),x-1,y,z-1)),
lerp(u,grad(p(A2+1),x,y-1,z-1),
grad(p(B2+1),x-1,y-1,z-1))))
EndProcedure
If OpenConsole()
PrintN("noise(3.14,42,7) => "+StrD(noise(3.14,42,7),17))
Input()
EndIf
</lang>
{{out}}
<pre>noise(3.14,42,7) => 0.13691995878400012</pre>
=={{header|Python}}==
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