Desenvolvimento de Software

Use a função Compile para gerar texturas processualmente

A função Compile pode ser utilizada para gerar texturas processualmente que podem ser aplicadas a objetos.

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dot = With[{grad = {{1, 1, 0}, {-1, 1, 0}, {1, -1, 0}, {-1, -1,

0}, {1, 0, 1}, {-1, 0, 1}, {1, 0, -1}, {-1, 0, -1}, {0, 1,

1}, {0, -1, 1}, {0, 1, -1}, {0, -1, -1}}},

Compile[{{gradIdx, _Integer}, {x, _Real}, {y, _Real}, {z, _Real}},

grad[[gradIdx + 1]][[1]]*x + grad[[gradIdx + 1]][[2]]*y +

grad[[gradIdx + 1]][[3]]*z

]

];

fade = Compile[{{t, _Real}}, t*t*t*(t*(t*6.0 - 15.0) + 10.0)];

lerp = Compile[{{x, _Real}, {y, _Real}, {t, _Real}}, (1.0 - t)*x +

t*y];

signedNoise =

With[{permutations =

Join[(permutations = RandomSample[Range[0, 255]]), permutations]},

Compile[{{x0, _Real}, {y0, _Real}, {z0, _Real}},

Module[{x, y, z, ix, iy, iz, g000, g001, g010, g011, g100, g101,

g110, g111, n000, n100, n010, n110, n001, n101, n011, n111, u,

v, w, nx00, nx01, nx10, nx11, nxy0, nxy1, nxyz},

ix = IntegerPart[x0];

iy = IntegerPart[y0];

iz = IntegerPart[z0];

x = x0 - ix;

y = y0 - iy;

z = z0 - iz;

ix = Mod[ix, 255] + 1;

iy = Mod[iy, 255] + 1;

iz = Mod[iz, 255] + 1;

g000 =

Mod[permutations[[

ix + permutations[[iy + permutations[[iz]]]]]], 12];

g001 =

Mod[permutations[[

ix + permutations[[iy + permutations[[iz + 1]]]]]], 12];

g010 =

Mod[permutations[[

ix + permutations[[iy + 1 + permutations[[iz]]]]]], 12];

g011 =

Mod[permutations[[

ix + permutations[[iy + 1 + permutations[[iz + 1]]]]]], 12];

g100 =

Mod[permutations[[

ix + 1 + permutations[[iy + permutations[[iz]]]]]], 12];

g101 =

Mod[permutations[[

ix + 1 + permutations[[iy + permutations[[iz + 1]]]]]], 12];

g110 =

Mod[permutations[[

ix + 1 + permutations[[iy + 1 + permutations[[iz]]]]]], 12];

g111 =

Mod[permutations[[

ix + 1 + permutations[[iy + 1 + permutations[[iz + 1]]]]]],

12];

n000 = dot[g000, x, y, z];

n100 = dot[g100, x - 1, y, z];

n010 = dot[g010, x, y - 1, z];

n110 = dot[g110, x - 1, y - 1, z];

n001 = dot[g001, x, y, z - 1];

n101 = dot[g101, x - 1, y, z - 1];

n011 = dot[g011, x, y - 1, z - 1];

n111 = dot[g111, x - 1, y - 1, z - 1];

u = fade[x];

v = fade[y];

w = fade[z];

nx00 = lerp[n000, n100, u];

nx01 = lerp[n001, n110, u];

nx10 = lerp[n010, n110, u];

nx11 = lerp[n011, n111, u];

nxy0 = lerp[nx00, nx10, v];

nxy1 = lerp[nx01, nx11, v];

nxyz = lerp[nxy0, nxy1, w];

nxyz

"CompilationTarget" -> "C"

]

];

classicPerlin =

With[{octaves = 8},

Compile[{{xIndex, _Integer}, {yIndex, _Integer}, {amplitude, \

_Real}, {frequency, _Real}, {gain, _Real}, {lacunarity, _Real}, \

{scale, _Real}, {increment, _Real}, {width, _Integer}, {height, \

_Integer}},

Module[{noiseVal = 0.0, x, y, z, freq = frequency,

amp = amplitude},

x = xIndex*frequency/scale;

y = yIndex*frequency/scale;

z = 1.0*frequency/scale;

Do[

noiseVal += signedNoise[x*freq, y*freq, z*freq]*amp;

freq *= lacunarity;

amp *= gain,

{octaves}

];

Min[Max[noiseVal, 0.0], 1.0]

]

];

ImageRecolor[img_, r_, g_, b_] :=

Image[{r*img, g*img, b*img}, Interleaving -> False]

perlin[width_Integer, height_Integer] :=

Table[classicPerlin[ii, jj, amplitude, frequency, gain, lacunarity,

scale, increment, width, height], {ii, 0, width}, {jj, 0,

height}];

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