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收集整理的這篇文章主要介紹了
柏林噪声产生火焰等纹理
小編覺(jué)得挺不錯(cuò)的,現(xiàn)在分享給大家,幫大家做個(gè)參考.
from： http://blog.csdn.net/jia20003/article/details/7220740
柏林噪聲是一種特殊的隨機(jī)噪聲，即對(duì)于每個(gè)給定的值產(chǎn)生的隨機(jī)數(shù)是唯一的，但是不同的
值產(chǎn)生不同的隨機(jī)數(shù)。關(guān)于柏林噪聲更詳細(xì)的解釋可以參考這里：
http://freespace.virgin.net/hugo.elias/models/m_perlin.htm
?
本文主要是探討如何使用柏林噪聲產(chǎn)生火焰效果與烏云效果的紋理，在解釋實(shí)現(xiàn)代碼之前，
首先來(lái)看一下影響柏林噪聲效果的兩個(gè)參數(shù)音度(Octave) 與余輝(Persistence)，可以調(diào)節(jié)
紋理的大小和密度。
?
最終實(shí)現(xiàn)的火焰紋理效果
最終實(shí)現(xiàn)的烏云紋理效果
最終實(shí)現(xiàn)的草地紋理效果–怎么感覺(jué)有點(diǎn)魔獸中精靈族的草地啊，哈哈
代碼解釋
首先產(chǎn)生隨機(jī)空白噪聲，使用隨機(jī)空白噪聲產(chǎn)生柏林噪聲，最后將柏林噪聲映射為RGB值
輸出到指定大小的圖像中，代碼如下:
float[][] whiteNoise = GenerateWhiteNoise(rows, cols);
float[][] perlinNoise = GeneratePerlinNoise(whiteNoise, 6); //
float[][] colorData = MapGray(perlinNoise);
?
白噪聲產(chǎn)生主要是利用JAVA中的系統(tǒng)時(shí)間作為種子，產(chǎn)生[0~1]之間的噪聲數(shù)組
代碼如下：
public float[][] GenerateWhiteNoise(int width,int height)
{
Random random = new Random(System.currentTimeMillis()); ???
float[][] noise = new float[width][height];
for (int i = 0; i < width; i++)
{
??? ??? for (int j = 0; j <height; j++)
??? ??? {
??? ???? ?? noise[i][j] = (float)random.nextDouble();
??? ??? }
??? }
??? return noise;
}
?
柏林噪聲的產(chǎn)生稍微復(fù)雜一點(diǎn)點(diǎn)，首先把上面的白噪聲數(shù)據(jù)帶入，利用插值公式產(chǎn)生平滑的噪聲
數(shù)據(jù)，具體要產(chǎn)生幾組平滑噪聲數(shù)據(jù)取決于音度(Octave)參數(shù)。本程序的插值公式非常簡(jiǎn)單，
代碼如下：
public float Interpolate(float x0,float x1, float alpha)
{
return x0 * (1 - alpha) + alpha * x1;
}
最后把這些組的平滑噪聲加上不同的振幅混合在一起產(chǎn)生一個(gè)輸出數(shù)組結(jié)果即為柏林噪聲。
完成上面這些還不足以產(chǎn)生那些效果震撼的紋理，另外一個(gè)頂級(jí)秘訣在于怎么把柏林噪聲
映射到你想要的RGB值。代碼如下：
?? ?float[][] MapGradient(float[][] perlinNoise)
??? {
??? ?? int width =perlinNoise.length;
??? ?? int height =perlinNoise[0].length;
??? ?? float[][] image = new float[width][height];
??? ?? int ta=0, tr=0, tb=0,tg=0;
??? ?? for (int i = 0; i <width; i++)
??? ?? {
??? ????? for (int j = 0; j <height; j++)
??? ????? {
??? ??? ??ta = 255;
??? ??? ??int u = (int)(perlinNoise[i][j] * (float)angryFireColorTable.length);
??? ??? ??tr = (int)angryFireColorTable[u][0];
??? ??? ??tg = (int)angryFireColorTable[u][1];
??? ??? ??tb = (int)angryFireColorTable[u][2];
??? ??? ??image[i][j] = (ta <<24) | (tr << 16) | (tg << 8) | tb;
??? ????? }
??? ?? }
??? ??
??? ?? return image;
??? }
程序完全源代碼如下：
[java] view plaincopy
package?com.gloomyfish.perlin.noise;????import?java.util.Random;????public?class?PerlinNoiseCreator?{????????????private?int[][]?angryFireColorTable?=?{??????????????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},??????????????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},??????????????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},??????????????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},??????????????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},??????????????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},??????????????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},??????????????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?204},????{255,?255,?199},??????????????????{255,?255,?199},????{255,?255,?197},????{255,?255,?197},????{255,?255,?193},????{255,?255,?193},??????????????{255,?255,?191},????{255,?255,?191},????{255,?255,?189},????{255,?255,?189},????{255,?255,?185},??????????????{255,?255,?185},????{255,?255,?183},????{255,?255,?183},????{255,?255,?179},????{255,?255,?179},??????????????{255,?255,?177},????{255,?255,?177},????{255,?255,?175},????{255,?255,?175},????{255,?255,?171},??????????????????????{255,?255,?171},????{255,?255,?169},????{255,?255,?169},????{255,?255,?167},????{255,?255,?167},??????????????{255,?255,?163},????{255,?255,?161},????{255,?255,?157},????{255,?255,?155},????{255,?255,?153},??????????????{255,?251,?149},????{255,?249,?147},????{255,?246,?144},????{255,?244,?142},????{255,?242,?140},??????????????{253,?244,?205},????{248,?246,?197},????{248,?246,?187},????{248,?245,?178},????{248,?245,?168},??????????????{247,?245,?160},????{248,?243,?149},????{247,?244,?141},????{249,?243,?133},????{248,?243,?123},??????????????{249,?242,?112},????{248,?242,?102},????{248,?242,?92},?{247,?241,?81},?{248,?241,?73},??????????????{247,?240,?63},?{249,?239,?53},?{247,?239,?42},?{249,?238,?32},?{249,?238,?26},??????????????{248,?234,?21},?{248,?231,?21},?{250,?224,?25},?{248,?218,?24},?{249,?214,?26},??????????????{249,?209,?26},?{252,?204,?32},?{251,?198,?32},?{251,?191,?33},?{251,?186,?34},??????????????{250,?179,?35},?{252,?176,?38},?{252,?169,?41},?{252,?164,?41},?{254,?157,?44},??????????????{254,?151,?46},?{253,?145,?47},?{254,?141,?49},?{251,?136,?47},?{253,?135,?48},??????????????{251,?130,?47},?{250,?129,?46},?{249,?126,?46},?{247,?124,?44},?{246,?120,?43},??????????????{244,?118,?41},?{243,?115,?42},?{241,?113,?40},?{242,?111,?41},?{240,?109,?39},??????????????{239,?104,?40},?{236,?101,?37},?{234,?99,?35},??{235,?97,?34},??{232,?93,?34},??????????????{231,?91,?32},??{229,?88,?32},??{227,?86,?30},??{227,?83,?30},??{225,?81,?28},??????????????{224,?78,?27},??{222,?76,?25},??{223,?72,?27},??{221,?70,?25},??{219,?66,?24},??????????????{216,?63,?22},??{216,?58,?21},??{212,?54,?19},??{210,?50,?18},??{209,?45,?17},??????????????{206,?40,?14},??{206,?37,?14},??{203,?32,?12},??{200,?29,?9},???{200,?24,?9},??????????????{197,?21,?6},???{195,?17,?7},???{191,?13,?3},???{190,?7,?3},????{188,?5,?1},??????????????{184,?2,?0},????{180,?0,?0},????{178,?0,?0},????{174,?0,?0},????{172,?0,?0},??????????????{169,?1,?0},????{164,?0,?1},????{160,?0,?0},????{158,?0,?0},????{154,?0,?0},??????????????{150,?0,?0},????{146,?0,?0},????{144,?0,?0},????{140,?0,?1},????{136,?0,?2},??????????????{133,?0,?1},????{130,?0,?0},????{126,?1,?0},????{124,?0,?2},????{120,?0,?1},??????????????{116,?0,?0},????{112,?0,?0},????{109,?1,?1},????{104,?0,?0},????{103,?0,?1},??????????????{98,?0,?0},?{95,?0,?0},?{92,?1,?0},?{92,?1,?0},?{90,?0,?0},??????????????{89,?1,?0},?{88,?0,?0},?{86,?0,?0},?{86,?0,?0},?{84,?0,?0},??????????????{84,?0,?0},?{82,?1,?0},?{82,?1,?0},?{80,?0,?0},?{80,?0,?0},??????????????{79,?1,?1},?{78,?0,?0},?{76,?0,?0},?{76,?0,?0},?{74,?0,?0},??????????????{74,?0,?0},?{72,?0,?1},?{72,?0,?1},?{70,?0,?0},?{70,?0,?0},??????????????{69,?1,?2},?{68,?0,?1},?{66,?0,?1},?{66,?0,?1},?{64,?0,?0},??????????????{62,?1,?0},?{61,?1,?1},?{60,?0,?0},?{60,?0,?0},?{60,?0,?0},??????????????{58,?0,?0},?{58,?0,?0},?{56,?0,?1},?{56,?0,?1},?{54,?0,?0},??????????????{54,?0,?0},?{52,?1,?0},?{51,?0,?0},?{50,?0,?1},?{50,?0,?1},??????????????{49,?1,?1},?{48,?0,?0},?{46,?0,?0},?{46,?0,?0},?{44,?0,?1},??????????????{42,?0,?1},?{42,?0,?1},?{40,?0,?0},?{40,?0,?0},?{39,?0,?0},??????????????{38,?0,?0},?{38,?0,?0},?{36,?0,?0},?{35,?0,?0},?{34,?0,?0},??????????????{34,?0,?0},?{32,?0,?1},?{30,?0,?0},?{30,?0,?0},?{29,?1,?0},??????????????{28,?0,?0},?{28,?0,?0},?{26,?0,?1},?{24,?0,?0},?{22,?1,?0},??????????????{22,?1,?0},?{21,?1,?0},?{20,?0,?0},?{19,?1,?1},?{19,?1,?1},??????????????{16,?0,?0},?{16,?0,?0},?{16,?0,?0},?{14,?0,?0},?{12,?0,?0},??????????????{12,?0,?0},?{11,?1,?0},?{10,?0,?0},?{9,?1,?0},??{8,?0,?0},??????????????{6,?0,?0},??{6,?0,?0},??{5,?1,?0},??{4,?0,?0},??{2,?1,?0},??????????????{2,?1,?0},??{1,?1,?1},??{0,?0,?0},??{0,?0,?0},??{0,?0,?0},??????????};??????????????public?void?generateNoise(int[]?noiseData,?int?rows,?int?cols)?{????????????float[][]?whiteNoise?=?GenerateWhiteNoise(rows,?cols);??????????float[][]?perlinNoise?=?GeneratePerlinNoise(whiteNoise,?6);?????????????????????float[][]?colorData?=?MapGray(perlinNoise);??????????int?index?=?0;??????????for(int?row?=?0;?row<rows;?row++)?{??????????????for(int?col=0;?col<cols;?col++)?{??????????????????index?=?row?*?cols?+?col;??????????????????noiseData[index]?=?(int)colorData[row][col];??????????????}??????????}??????}????????????public?float[][]?GenerateWhiteNoise(int?width,?int?height)??????{??????????Random?random?=?new?Random(System.currentTimeMillis());???????????float[][]?noise?=?new?float[width][height];?????????????????for?(int?i?=?0;?i?<?width;?i++)??????????{??????????????for?(int?j?=?0;?j?<?height;?j++)??????????????{??????????????????noise[i][j]?=?(float)random.nextDouble();??????????????}??????????}?????????????????return?noise;??????}????????????public?float[][]?GenerateSmoothNoise(float[][]?baseNoise,?int?octave)??????{?????????int?width?=?baseNoise.length;?????????int?height?=?baseNoise[0].length;????????????????float[][]?smoothNoise?=?new?float[width][height];????????????????int?samplePeriod?=?1?<<?octave;??????????float?sampleFrequency?=?1.0f?/?samplePeriod;????????????????for?(int?i?=?0;?i?<?width;?i++)?????????{????????????????????????int?sample_i0?=?(i?/?samplePeriod)?*?samplePeriod;????????????int?sample_i1?=?(sample_i0?+?samplePeriod)?%?width;?????????????float?horizontal_blend?=?(i?-?sample_i0)?*?sampleFrequency;???????????????????for?(int?j?=?0;?j?<?height;?j++)????????????{??????????????????????????????int?sample_j0?=?(j?/?samplePeriod)?*?samplePeriod;???????????????int?sample_j1?=?(sample_j0?+?samplePeriod)?%?height;????????????????float?vertical_blend?=?(j?-?sample_j0)?*?sampleFrequency;?????????????????????????????????????float?top?=?Interpolate(baseNoise[sample_i0][sample_j0],??????????????????baseNoise[sample_i1][sample_j0],?horizontal_blend);?????????????????????????????????????float?bottom?=?Interpolate(baseNoise[sample_i0][sample_j1],??????????????????baseNoise[sample_i1][sample_j1],?horizontal_blend);?????????????????????????????????????smoothNoise[i][j]?=?Interpolate(top,?bottom,?vertical_blend);????????????}?????????}????????????????return?smoothNoise;??????}????????????public?float?Interpolate(float?x0,?float?x1,?float?alpha)??????{?????????return?x0?*?(1?-?alpha)?+?alpha?*?x1;??????}????????????public?float[][]?GeneratePerlinNoise(float[][]?baseNoise,?int?octaveCount)??????{?????????int?width?=?baseNoise.length;?????????int?height?=?baseNoise[0].length;????????????????float[][][]?smoothNoise?=?new?float[octaveCount][][];?????????????????float?persistance?=?0.5f;??????????????????????????for?(int?i?=?0;?i?<?octaveCount;?i++)?????????{?????????????smoothNoise[i]?=?GenerateSmoothNoise(baseNoise,?i);?????????}?????????????????float[][]?perlinNoise?=?new?float[width][height];??????????float?amplitude?=?1.0f;??????????float?totalAmplitude?=?0.0f;???????????????????????????for?(int?octave?=?octaveCount?-?1;?octave?>=?0;?octave--)??????????{?????????????amplitude?*=?persistance;?????????????totalAmplitude?+=?amplitude;????????????????????for?(int?i?=?0;?i?<?width;?i++)?????????????{????????????????for?(int?j?=?0;?j?<?height;?j++)????????????????{???????????????????perlinNoise[i][j]?+=?smoothNoise[octave][i][j]?*?amplitude;????????????????}?????????????}??????????}?????????????????????????for?(int?i?=?0;?i?<?width;?i++)?????????{????????????for?(int?j?=?0;?j?<?height;?j++)????????????{???????????????perlinNoise[i][j]?/=?totalAmplitude;????????????}?????????}????????????????return?perlinNoise;??????}????????????float[][]?MapGray(float[][]?perlinNoise)??????{?????????int?width?=?perlinNoise.length;?????????int?height?=?perlinNoise[0].length;?????????float[][]?image?=?new?float[width][height];?????????int?ta=0,?tr=0,?tb=0,?tg=0;?????????for?(int?i?=?0;?i?<?width;?i++)?????????{????????????for?(int?j?=?0;?j?<?height;?j++)????????????{????????????????ta?=?255;????????????????int?u?=?(int)(perlinNoise[i][j]?*?(float)80.0);????????????????tr?=?u+100;????????????????tg?=?u+100;????????????????tb?=?u+100;????????????????????????????????image[i][j]?=?(ta?<<?24)?|?(tr?<<?16)?|?(tg?<<?8)?|?tb;????????????????????????????}?????????}??????????????????return?image;??????}????????????float[][]?MapGradient(float[][]?perlinNoise)??????{?????????int?width?=?perlinNoise.length;?????????int?height?=?perlinNoise[0].length;?????????float[][]?image?=?new?float[width][height];?????????int?ta=0,?tr=0,?tb=0,?tg=0;?????????for?(int?i?=?0;?i?<?width;?i++)?????????{????????????for?(int?j?=?0;?j?<?height;?j++)????????????{????????????????ta?=?255;????????????????int?u?=?(int)(perlinNoise[i][j]?*?(float)angryFireColorTable.length);????????????????tr?=?(int)angryFireColorTable[u][0];????????????????tg?=?(int)angryFireColorTable[u][1];????????????????tb?=?(int)angryFireColorTable[u][2];????????????????image[i][j]?=?(ta?<<?24)?|?(tr?<<?16)?|?(tg?<<?8)?|?tb;????????????}?????????}??????????????????return?image;??????}????}?? 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z18770085003 2014-12-21 16:45發(fā)表 [回復(fù)] 你上面那些二維素組都是width在外循環(huán)么？感覺(jué)怎么和一般矩陣的存儲(chǔ)方式相反了呢？一般是內(nèi)循環(huán)才是width呀。。。不知道我理解對(duì)了么？
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rex_zhu 2014-03-24 16:00發(fā)表 [回復(fù)] 萬(wàn)能的樓主啊，還在嗎，為啥我用了您的代碼以后，輸出的數(shù)組和輸入的數(shù)組完全一樣啊.......一番運(yùn)算后白噪聲還是白噪聲 Re: gloomyfish 2014-03-24 16:03發(fā)表 [回復(fù)] 回復(fù)rex_zhu：可能你運(yùn)算精度不對(duì)，或者什么的，總之原理就是這個(gè)
或者是你的lookup color table有問(wèn)題！
2樓
fulongfuhu 2013-07-15 08:22發(fā)表 [回復(fù)] 用你寫(xiě)的MapGray函數(shù) 同樣是一塊一塊的，我感覺(jué)是平滑函數(shù)這里有問(wèn)題，我是用vc改寫(xiě)的 Re: gloomyfish 2013-07-15 09:20發(fā)表 [回復(fù)] 回復(fù)fulongfuhu：有可能是計(jì)算精度的問(wèn)題，我run Java一直沒(méi)問(wèn)題啊！ Re: fulongfuhu 2013-07-15 16:46發(fā)表 [回復(fù)] 回復(fù)jia20003：可以把文章中帶界面的java程序源碼給一份嗎？ Re: fulongfuhu 2013-07-15 20:11發(fā)表 [回復(fù)] 回復(fù)fulongfuhu：jingshishengxu@gmail.com，謝謝 Re: fulongfuhu 2013-07-15 20:19發(fā)表 [回復(fù)] 回復(fù)fulongfuhu：不用了，弄好了，是我代碼一個(gè)地方改錯(cuò)了，謝謝 Re: gloomyfish 2013-07-15 22:24發(fā)表 [回復(fù)] 回復(fù)fulongfuhu：贊！
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fulongfuhu 2013-07-14 08:07發(fā)表 [回復(fù)] 我用你的代碼，為什么出來(lái)的火焰效果是一塊一塊的，不連續(xù)呢？ Re: gloomyfish 2013-07-14 15:25發(fā)表 [回復(fù)] 回復(fù)fulongfuhu：應(yīng)該不會(huì)吧，你有調(diào)整color table嘛，一定要調(diào)整color table
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