// Randomly place (and alpha-blend) bitmap on top of something else// RamdomBitmap.osl by Zap Andersson)// Modified: 2019-11-26// Modified: 2021-03-26 by Saul Espinosa for Redshift 3D// Copyright 2019 Autodesk Inc, All rights reserved. This file is licensed under Apache 2.0 license// https://github.com/ADN-DevTech/3dsMax-OSL-Shaders/blob/master/LICENSE.txtcolor TextureFetch(string filename, point lp, output float a){color rgb = texture(filename, lp[0], 1.0-lp[1], "alpha", a, "wrap", "clamp");int channels = 3;gettextureinfo(filename, "channels", channels);if (channels <= 3) // If there is no alpha...a = 1.0; // ...use 1.0return rgb;}shader RandomBitmaps[[ string help = "Randomly place (and alpha blend) a set of<br>bitmaps on top of something else",string version = "2.0.0",string label = "Randomized Bitmaps", string page = "0 : General" ]](int Layers = 1 [[ int min=1, int max=9, int connectable=0, string page = "0 : General" ]],vector UVW = vector(u,v,0) [[string page = "3 : Other"]],float Scale = 1.0 [[ float min = 0, float max = 2, string label = "Overall Scale", string page = "0 : General" ]],color Input = 0.0[[ string label = "Background RGB", string page = "0 : General",string help="The input color on top of which everything else is put. Thia allows cascading multiple RandomBitmap on top of each other easily..." ]],float InputAlpha = 1.0[[ float min = 0, float max = 1.0,string label = "Background Alpha", string page = "0 : General",string help="The input alpha on top of which everything else is put. Thia allows cascading multiple RandomBitmap on top of each other easily..." ]],#define LAYER(x) \string Filename##x = "" \[[ string widget="filename", \string label="File name " #x, \string help="The name of the bitmap to place randomly", string page = "1 : Textures" ]],LAYER(0)//====LAYER-BEGIN====LAYER(1)LAYER(2)LAYER(3)LAYER(4)LAYER(5)LAYER(6)LAYER(7)LAYER(8)LAYER(9)//====LAYER-END====#undef LAYERint NumFiles = 0[[ string label = "Limit to N Files",string help = "By default, all files are used, but for testing purpouses, ""one can choose to only use a few of them by setting this ""value greater than zero.",int min = 0, int max = 10, string page = "0 : General" ]],int Seed = 39[[ string help="The random seed", string page = "2 : Randomization", int min = 0, int max = 100 ]],vector Probability = vector(1.0, 0.0, 0.1)[[ string help="Three values: The probability a bitmap will show up, the randomness of the variation in the probability, and the scale of said randomness",float min = 0.0,float max = 1.0, string page = "2 : Randomization" ]],vector PosRandom = vector(0.5,0.5,0.0)[[ string page = "2 : Randomization", string help="Position randomness. For large numbers you may have to turn Overlap up, but impacts performance! Note: the Z value is not used." ]],vector ScaleMin = vector(1.0, 1.0, 0.0)[[ string help="The scale randomness. For large scales you may have to turn Overlap up, but impacts performance! Note: the Z value is not used." ,float min = 0.0,float max = 10.0, string page = "2 : Randomization" ]],vector ScaleMax = vector(1.0, 1.0, 0.0)[[ string help="The scale randomness. For large scales you may have to turn Overlap up, but impacts performance! Note: the Z value is not used." ,float min = 0.0,float max = 10.0, string page = "2 : Randomization" ]],int UniformScale = 1[[ string widget="checkBox",string help="If enabled, U and V scales in sync with each other, if off, they scale independently", string label = "Randomize Scale Proportionally", string page = "2 : Randomization" ]],float PixelScale = 0.0[[ float min = 0, float max = 8192, float sensitivity = 1, string page = "2 : Randomization", string help="Relates pixels to image size.<ul><li>If zero, each image is considered to be a 1.0 x 1.0 square in UV space.<li>If nonzero, maps that many pixels to a the size of 1.0, so that images are the same size w.r.t. to pixels <i>and</i> retains their aspect ratio.<br/><b>NOTE</b>: Sizes ending up larger than 1.0 will require turning up Overlap, which reduces performance!</li></ul>" ]],float RotMin = 0.0[[ string help="The Rotational randomness." ,float min = -180,float max = 0, string page = "2 : Randomization", float sensitivity = 1 ]],float RotMax = 0.0[[ string help="The Rotational randomness." ,float min = 0,float max = 180, string page = "2 : Randomization", float sensitivity = 1 ]],int RotSteps = 1[[ string help="Number of 'steps' of Rotational randomness. 1 means 'no steps'.<br><br>For example, to rotate something only 0, 90, 180 and 270 degrees, set min rotation to 0, max rotation to 270, and RotSteps to 4." ,int min = 1,int max = 10, string page = "2 : Randomization" ]],vector HSVMin = vector(0.0, 1.0, 1.0)[[ string help="Hue/Saturation/Value randomness. Start range of hue shift and saturation/value scaling" ,float min = -2.0,float max = 2.0, string page = "2 : Randomization" ]],vector HSVMax = vector(0.0, 1.0, 1.0)[[ string help="Hue/Saturation/Value randomness. End range of hue shift and saturation/value scaling" ,float min = -2.0,float max = 2.0, string page = "2 : Randomization" ]],float AlphaMin = 1.0[[ string help="The Alpha randomness. Minimum multiplier of alpha." ,float min = 0.0,float max = 1.0, string page = "2 : Randomization" ]],float AlphaMax = 1.0[[ string help="The Alpha randomness. Maximum multiplier of alpha." ,float min = 0.0,float max = 1.0, string page = "2 : Randomization" ]],float GammaMin = 0.0[[ string help="The Gamma randomness. Minimum offset of gamma value." ,float min = -5.0,float max = 5.0, string page = "2 : Randomization" ]],float GammaMax = 0.0[[ string help="The Gamma randomness. Maximum offset of gamma value." ,float min = -5.0,float max = 5.0, string page = "2 : Randomization" ]],int Clamp = 1[[ string widget = "checkBox", string page = "3 : Other",string help = "Large color tweaks can yield colors outside of the 0-1 range. It's a good idea to clamp those colors to the 0-1 range..." ]],float ManualGamma = 2.2[[ string label="Manual Gamma", string page = "3 : Other" ]],int OverLap = 1[[ string help="For very large scales or position shifts, you may see cut-off textures. This means the shader may need to look further into more neighbouring cells. Increasing this reduces performance A LOT so ONLY do this if absolutely necessary!",int min=0, int max=5, string page = "3 : Other" ]],output color Out = 0.0,output float Alpha = 1.0,){// Adjust behaviour based on versionint oslversion = 0;getattribute("osl:version", oslversion);point UVWs = UVW / Scale;int ix = int(floor(UVWs[0]));int iy = int(floor(UVWs[1]));float fx = UVWs[0] - ix;float fy = UVWs[1] - iy;float gamma = 1.0;gamma = ManualGamma;// Start with the output being the inputOut = Input;Alpha = InputAlpha;// The modulo value is number of layers+1int modValue = Layers+1;// Has the user chosen to limit number of files?if (NumFiles > 0 && NumFiles <= Layers)modValue = NumFiles;for (int xx = -OverLap; xx <= OverLap; xx++){for(int yy = -OverLap; yy <= OverLap; yy++){// The point used for all the randomnesspoint rndpoint = point(ix + xx, iy + yy, Seed);// Compensate for old cellnoise behaviourif (oslversion >= 11000){rndpoint[0] = rndpoint[0] < 0 ? rndpoint[0]-1: rndpoint[0];rndpoint[1] = rndpoint[1] < 0 ? rndpoint[1]-1: rndpoint[1];rndpoint[2] = rndpoint[2] < 0 ? rndpoint[2]-1: rndpoint[2];}// Random pos datapoint pos = ((noise("cell", rndpoint, 0) - vector(0.5,0.5,0.0)) * vector(PosRandom[0], PosRandom[1], 1.0));// The actual lookup pointpoint lp = point(fx-xx, fy-yy, 0) - pos;float prob = Probability[0] + noise("perlin", rndpoint * Probability[2]) * Probability[1];if (pos[2] < prob){// Scale and rotation randomnesspoint scr = noise("cell", rndpoint, 1);int pic = int((float)noise("cell", rndpoint, 15) * 100) % modValue;// XY scaling tweakfloat sx = 1.0, sy = 1.0;if (PixelScale > 0.0){int res[2];if (pic == 0) gettextureinfo(Filename0, "resolution", res);#define LAYER(x) else if (pic == x) gettextureinfo(Filename##x, "resolution", res);//====LAYER-BEGIN====LAYER(0)LAYER(1)LAYER(2)LAYER(3)LAYER(4)LAYER(5)LAYER(6)LAYER(7)LAYER(8)LAYER(9)//====LAYER-END====#undef LAYERsx = res[0] / PixelScale;sy = res[1] / PixelScale;}float scaleX = sx * mix(ScaleMin[0], ScaleMax[0], scr[0]);float scaleY = sy * mix(ScaleMin[1], ScaleMax[1], scr[UniformScale?0:1]);if (RotSteps > 1){scr[2] = floor(scr[2] * RotSteps) / (RotSteps - 1);}float rot = mix(RotMin, RotMax, scr[2]);lp -= 0.5;lp = rotate(lp, radians(rot), point(0,0,0), vector(0,0,1));lp /= vector(scaleX, scaleY, 1.0);lp += 0.5;if (lp[0] >= 0.0 && lp[0] < 1.0 &&lp[1] >= 0.0 && lp[1] < 1.0){color rgb;float a = 1.0;if (pic == 0) rgb = TextureFetch(Filename0, lp, a);#define LAYER(x) else if (pic == x) rgb = TextureFetch(Filename##x, lp, a);//====LAYER-BEGIN====LAYER(0)LAYER(1)LAYER(2)LAYER(3)LAYER(4)LAYER(5)LAYER(6)LAYER(7)LAYER(8)LAYER(9)//====LAYER-END====#undef LAYERif (a > 0.0){// Color randomnesspoint clr = noise("cell", rndpoint, 2);// Alpha and Gamma randomnesspoint arr = noise("cell", rndpoint, 3);float gr = mix(GammaMin, GammaMax, arr[1]);if (gamma + gr != 1.0)rgb = pow(rgb, gamma + gr);vector hsvTweak = mix(HSVMin, HSVMax, clr);float ar = mix(AlphaMin, AlphaMax, arr[0]);color hsv = transformc("rgb", "hsv", rgb);hsv[0] += hsvTweak[0]; // Offset the huehsv[1] *= hsvTweak[1]; // Scale the saturationhsv[2] *= hsvTweak[2]; // Scale the valuergb = transformc("hsv", "rgb", hsv);// Apply alpha randomnessrgb *= ar; a *= ar;if (Clamp)rgb = clamp(rgb, 0.0, 1.0);}Alpha = 1.0 - ((1.0-Alpha)*(1.0-a));Out = Out * (1.0-a) + rgb;}}}}}
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