Voronoi Shader (Source code included)

算法来自于Advanced Renderman，又加了一下边边角角。不是很完整，在源文件里能看到有很多参数没实现。

 

 

 

//voronoi_h.slvoid voronoi_f1(pointP;floatjitter;outputfloatf1;outputpointpos1;){pointcell = point(floor(P[0]),floor(P[1]),floor(P[2]))+vector(0.5);uniformfloati,j,k;pointcurrentCell,currentPos;f1 = 1e9;for(i = -1;i<=1;i+=1)for(j = -1;j<=1;j+=1)for(k = -1;k<=1;k+=1){currentCell = cell+vector(i,j,k);currentPos = currentCell + jitter*(vector cellnoise(currentCell)-.5);floatl = length(currentPos - P);if (l<f1){f1 = l;pos1 = currentPos;};}}void voronoi_f1f2(pointP;floatjitter;outputfloatf1;outputpointpos1;outputfloatf2;outputpointpos2;){pointcell = point(floor(P[0]),floor(P[1]),floor(P[2]))+vector(0.5);uniformfloati,j,k;pointcurrentCell,currentPos;f1 = 1e9;f2 = f1;for(i = -1;i<=1;i+=1)for(j = -1;j<=1;j+=1)for(k = -1;k<=1;k+=1){currentCell = cell+vector(i,j,k);currentPos = currentCell + jitter*(vector cellnoise(currentCell)-.5);floatl = length(currentPos - P);if (l<f1){f2 = f1;pos2 = pos1;f1 = l;pos1 = currentPos;}else if(l<f2){f2 = l;pos2 = currentPos;}}}

 

#include "voronoi_h.sl"colorlocIllumVoronoi(normalN;colorKa;colorC;colorKs;floatroughness; ){extern vectorI;vectorIN = normalize(I);return (diffuse(N)*C + Ka + Ks*specular(N,-IN,roughness));}surfacevoronoi(colorKa = .1;//matrixM = 1;floatscale = 1;floatjitter = 1;floatjitterWall = 0.1;colorKs_Cell = .7;colorKs_Wall = .3;floatroughness_Cell = 0.5;floatroughness_Wall = 0.2;colorcolor_Wall = 1;floatwallThreshold = 0.1;floatwallBlurness = 0.3;floatheight_Wall = 0.1;floatheight_Cell = 0.05; ){vectorNf = faceforward(normalize(N),I);pointPw = transform("world",P);/////////////////////////////////////////////*matrixtmpM = 2;Pw = transform(1/tmpM,Pw);uniformfloataaa = 0;if (aaa<1){printf("%m/n",placement);aaa = 1;}Ci = color(Pw);*//////////////////////////////////////////////floatf1,f2;pointpos1,pos2;voronoi_f1f2(Pw/scale,jitter,f1,pos1,f2,pos2);floatvalue;value = smoothstep(wallThreshold-wallBlurness*.1,wallThreshold+wallBlurness*.1,f2 - f1);value = clamp(value,0,1);// 0 - wall// 1 - cellcolorCWall,CCell,C,illumWall,illumCell,illum;floathWall,hCell,h;// Displacementif (value!=0)hCell = (1-f1) * height_Cell;if (value!=1)hWall = height_Wall;h = mix(hWall,hCell,value);vector Nw = normalize(ntransform("world",N));Pw += Nw*h;P = transform("world","current",Pw);N = calculatenormal(P);Nf = faceforward(normalize(N),I);/*////////////////////////if (value == 0) Ci = color(1,0,0);else if (value == 1) Ci = color(0,1,0);else Ci = value;Ci = diffuse(Nf);*/// Shadingif (value!=0){float _v = random();CCell = color "hsv" (cellnoise(pos1),1,1);illumCell = locIllumVoronoi(Nf,Ka,CCell,Ks_Cell,roughness_Cell);}if (value!=1){CWall = color_Wall;illumWall = locIllumVoronoi(Nf,Ka,CWall,Ks_Wall,roughness_Wall);}C = mix(CWall,CCell,value);illum = mix(illumWall,illumCell,value);// ShadingCi =C*illum*Cs;}