/usr/share/povray-3.7/include/makegrass.inc is in povray-includes 1:3.7.0.0-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/3.0/ or send a
// letter to Creative Commons, 444 Castro Street, Suite 900, Mountain View, California, 94041, USA.
// Persistence of Vision Ray Tracer version 3.6 / 3.7 Include File
// File: makegrass.inc
// --------------------------------------
// Author: Gilles Tran, 1999-2004, http://www.oyonale.com
// former mgrass.pov by Gilles Tran
// Updated for POV-Ray 3.7: March-2013
//
// Description: macros for creating grass.
// ================================================
// This file presents 3 macros
// MakeBlade() creates an individual blade of grass
// MakeGrassPatch() creates a patch of grass (mesh)
// optional with saving the mesh in a text file
// MakePrairie() creates a prairie of grass patches
// ------------------------------------------------
#ifndef( makegrass_Inc_Temp)
#declare makegrass_Inc_Temp=version;
#version 3.6;
#ifdef(View_POV_Include_Stack)
#debug "including makegrass.inc\n"
#end
//==============================================
// MakeBlade macro
//==============================================
// The MakeBlade macro creates a grass blade with a central fold
// The blade is positionned at posBlade and rotated around the y axis according to segBlade
// Its length is lBlade.
// The blade bends from vector startBend to vector endBend
// The describes how the curbe bends; low power bend faster
// --------------------------------------
// It first creates an array of points (vertices)
// Then it calculates the normals (optional)
/*
#declare doSmooth = true; // smooth triangles
#declare posBlade = <0,0,0>; // position of blade
#declare rotBlade = 100; // rotation of blade around y
#declare segBlade= 20; // number of blade segments - try low values (5 for instance) for tests
#declare lBlade = 10; // length of blade
#declare xBladeStart = 1; // width of blade at start
#declare xBladeEnd = 0.1; // width of blade at the end
#declare zBladeStart = 0.5; // depth of blade fold at start
#declare startBend = <0,1,0>; // bending of blade at start (<0,1,0>=no bending)
#declare vBend = <0,0,1>; // force bending the blade (<0,1,1> = 45°)
#declare pwBend = 1; // bending power (how slowly the curve bends)
#declare dofold = false; // true creates a fold in the blade (twice more triangles)
#declare dofile = false; // true creates a mesh file
// --------------------------------------
*/
//---------------------------------------------------------------------------------------------------------------
#macro MakeBlade( doSmooth, // 0 or 1,// smooth triangles
posBlade, // <0,0,0>,// position of blade
rotBlade, // 00,// rotation of blade around y
segBlade, // 20,// number of blade segments, try low values (5 for instance) for tests
lBlade, // 10,// length of blade
xBladeStart, // 1,// width of blade at start
xBladeEnd, // 0.1,// width of blade at the end
zBladeStart, // 0.5,// depth of blade fold at start
startBend, //<0,1,0.3>,// bending of blade at start (<0,1,0>=no bending)
vBend, // <0,0,1>,// force bending the blade (<0,1,1> = 45°)
pwBend, // 1,// bending power (how slowly the curve bends)
dofold, // 0 or 1,// true or 1 creates a fold in the blade (twice more triangles)
dofile // 0 or 1,// true or 1 creates a mesh file
) //--------------------------------------------------------------------------------------------
#local lsegBlade=lBlade/segBlade;
#if (dofold=true)
#local nI=3;
#else
#local nI=2;
#end
#local nJ=segBlade+1;
#local nP=nI*nJ;
#local P=array[nP]
#local N=array[nP]
#local pBlade=<0,0,0>;
#local Count=0;
#local xBlade=xBladeStart;
#local zBlade=zBladeStart;
#if (dofold=true)
#local P[0]=vaxis_rotate(-x*xBlade,y,rotBlade)+posBlade;
#local P[1]=vaxis_rotate(z*zBlade,y,rotBlade)+posBlade;
#local P[2]=vaxis_rotate(x*xBlade,y,rotBlade)+posBlade;
#else
#local P[0]=vaxis_rotate(-x*xBlade,y,rotBlade)+posBlade;
#local P[1]=vaxis_rotate(x*xBlade,y,rotBlade)+posBlade;
#end
#local Count=1;
#local pBlade=vnormalize(startBend)*lsegBlade;
// --------------------------------------
// Fills the array of points
// --------------------------------------
#while (Count<nJ)
#local tBlade=Count/segBlade;
// This is where the blade shape is defined
#local pBlade=pBlade+lsegBlade*vnormalize(vnormalize(pBlade)+ vBend*pow(tBlade,pwBend));
#local xBlade=xBladeStart+tBlade*(xBladeEnd-xBladeStart);
#if (dofold=true)
#local zBlade=zBladeStart*(1-tBlade);
#local P[Count*nI]=vaxis_rotate(pBlade-x*xBlade,y,rotBlade)+posBlade;
#local P[Count*nI+1]=vaxis_rotate(pBlade+z*zBlade,y,rotBlade)+posBlade;
#local P[Count*nI+2]=vaxis_rotate(pBlade+x*xBlade,y,rotBlade)+posBlade;
#else
#local P[Count*nI]=vaxis_rotate(pBlade-x*xBlade,y,rotBlade)+posBlade;
#local P[Count*nI+1]=vaxis_rotate(pBlade+x*xBlade,y,rotBlade)+posBlade;
#end
#local Count=Count+1;
#end
// --------------------------------------
// Calculates normals if doSmooth = true
// --------------------------------------
#if (doSmooth=true)
#local N = array[nP] // Normales
#local q=0;
#while (q<nP)
#local i=mod(q,nI);#local j=(q-i)/nI;
#local V0 = q-nI-1;#if (i=0) #local V0=-1; #end
#local V1 = q-nI;
#local V2 = q-nI+1;#if (i=nI-1) #local V2=-1; #end
#local V3 = q-1;#if (i=0) #local V3=-1; #end
#local V4 = q;
#local V5 = q+1;#if (i=nI-1) #local V5=-1; #end
#local V6 = q+nI-1;#if (i=0) #local V6=-1; #end
#local V7 = q+nI;
#local V8 = q+nI+1;#if (i=nI-1) #local V8=-1; #end
#if (j=0) #local V0=-1;#local V1=-1;#local V2=-1;#end
#if (j=nJ-1) #local V6=-1;#local V7=-1;#local V8=-1; #end
#local N[q]=<0,0,0>;
#local k=0;
#if (V5>-1 & V8>-1) #local N[q]=N[q]+vcross(P[V4]-P[V5],P[V8]-P[V4]);#local k=k+1;#end
#if (V2>-1 & V5>-1) #local N[q]=N[q]+vcross(P[V4]-P[V2],P[V5]-P[V4]);#local k=k+1;#end
#if (V1>-1 & V2>-1) #local N[q]=N[q]+vcross(P[V4]-P[V1],P[V2]-P[V4]);#local k=k+1;#end
#if (V0>-1 & V1>-1) #local N[q]=N[q]+vcross(P[V4]-P[V0],P[V1]-P[V4]);#local k=k+1;#end
#if (V3>-1 & V0>-1) #local N[q]=N[q]+vcross(P[V4]-P[V3],P[V0]-P[V4]);#local k=k+1;#end
#if (V6>-1 & V3>-1) #local N[q]=N[q]+vcross(P[V4]-P[V6],P[V3]-P[V4]);#local k=k+1;#end
#if (V7>-1 & V6>-1) #local N[q]=N[q]+vcross(P[V4]-P[V7],P[V6]-P[V4]);#local k=k+1;#end
#if (V8>-1 & V7>-1) #local N[q]=N[q]+vcross(P[V4]-P[V8],P[V7]-P[V4]);#local k=k+1;#end
#local N[q]=N[q]/k;
#local q=q+1;#end
#end
// --------------------------------------
// Writes the triangles
// --------------------------------------
#local q=0;
#while (q<(nI*(nJ-1)-1))
#local i=mod(q,nI);#local j=(q-i)/nI;
#if (i <nI-1)
#if (doSmooth=true)
#if (dofile=true)
#write(filehandle,"smooth_triangle{<",P[q].x,",",P[q].y,",",P[q].z,">,<",N[q].x,",",N[q].y,",",N[q].z,">,<",P[q+1].x,",",P[q+1].y,",",P[q+1].z,">,<",N[q+1].x,",",N[q+1].y,",",N[q+1].z,">,<",P[q+nI+1].x,",",P[q+nI+1].y,",",P[q+nI+1].z,">,<",N[q+nI+1].x,",",N[q+nI+1].y,",",N[q+nI+1].z,">}\n")
#write(filehandle,"smooth_triangle{<",P[q].x,",",P[q].y,",",P[q].z,">,<",N[q].x,",",N[q].y,",",N[q].z,">,<",P[q+nI].x,",",P[q+nI].y,",",P[q+nI].z,">,<",N[q+nI].x,",",N[q+nI].y,",",N[q+nI].z,">,<",P[q+nI+1].x,",",P[q+nI+1].y,",",P[q+nI+1].z,">,<",N[q+nI+1].x,",",N[q+nI+1].y,",",N[q+nI+1].z,">}\n")
#else
smooth_triangle{P[q],N[q],P[q+1],N[q+1],P[q+nI+1],N[q+nI+1]}
smooth_triangle{P[q],N[q],P[q+nI],N[q+nI],P[q+nI+1],N[q+nI+1]}
#end
#else
#if (dofile=true)
#write(filehandle,"triangle{<",P[q].x,",",P[q].y,",",P[q].z,">,<",P[q+1].x,",",P[q+1].y,",",P[q+1].z,">,<",P[q+nI+1].x,",",P[q+nI+1].y,",",P[q+nI+1].z,">}\n")
#write(filehandle,"triangle{<",P[q].x,",",P[q].y,",",P[q].z,">,<",P[q+nI].x,",",P[q+nI].y,",",P[q+nI].z,">,<",P[q+nI+1].x,",",P[q+nI+1].y,",",P[q+nI+1].z,">}\n")
#else
triangle{P[q],P[q+1],P[q+nI+1]}
triangle{P[q],P[q+nI],P[q+nI+1]}
#end
#end
#end
#local q=q+1;#end
#end
// --------------------------------------
// End of the MakeBlade macro
//==============================================
//==============================================
// MakeGrassPatch macro
//==============================================
// The MakeGrassPatch macro creates a grass patch by creating
// individual blades with the MakeBlade macro
// The resulting patch is a mesh of nBlade*nBlade individual blades
// Its size is lPatch*lPatch
// The main tuning parameters are segBlade and nBlade (keep low to test)
// --------------------------------------
// Patch parameters
// --------------------------------------
/*
#declare lPatch=50; // size of patch
#declare nBlade=40; // number of blades per line
#declare ryBlade = 60; // initial y rotation of blade
#declare segBlade= 15; // number of blade segments
#declare lBlade = 15; // length of blade
#declare wBlade = 1; // width of blade at start
#declare wBladeEnd = 0.3; // width of blade at the end
#declare doSmooth=false; // true makes smooth triangles
#declare startBend = <0,1,0.3>; // bending of blade at start (<0,1,0>=no bending)
#declare vBend = <0,-1,2>; // direction of the force bending the blade (<0,1,1> = 45°)
#declare pwBend = 3; // bending power (how slowly the curve bends)
#declare rd = 459; // seed
#declare stdposBlade = 1; // standard deviation of blade position 0..1
#declare stdrotBlade = 360; // standard deviation of rotation
#declare stdBlade = 3; // standard deviation of blade scale;
#declare stdBend = 0; // standard deviation of blade bending;
#declare dofold = false; // true creates a central fold in the blade (twice more triangles)
#declare dofile = true; // true creates a mesh file
#declare fname = "fgrass.inc" // name of the mesh file to create
// --------------------------------------
*/
// -------------------------------------------------------------------------------------------------------
#macro MakeGrassPatch( lPatch, // 50, // size of patch
nBlade, // 40, // number of blades per line
ryBlade, // 60, // initial y rotation of blade
segBlade, // 15, // number of blade segments
lBlade, // 15, // length of blade
wBlade, // 1, // width of blade at start
wBladeEnd, // 0.3, // width of blade at the end
doSmooth, // 0 or 1, // true or 1 makes smooth triangles
startBend,//<0,1,0.3>,// bending of blade at start (<0,1,0>=no bending)
vBend, //<0,-1,2>, // direction of the force bending the blade (<0,1,1> = 45°)
pwBend, // 3, // bending power (how slowly the curve bends)
rd, //18264, // random seed
stdposBlade, // 0..1, // standard deviation of blade position
stdrotBlade, // 360, // standard deviation of rotation
stdBlade, // 3, // standard deviation of blade scale
stdBend, // 0, // standard deviation of blade bending
dofold, //0 or 1, // true or 1 creates a central fold in the blade (twice more triangles)
dofile, //0 or 1, // true or 1 creates a mesh file
fname // "grass_01.inc" // string, name of the mesh file to create
) //-------------------------------------------------------------------------------
#if(dofile=true)
#warning concat(fname," mesh file creation starts\n")
#fopen filehandle fname write // creates the leaf mesh (individual leaf)
#write(filehandle,"mesh{\n")
#else
mesh{
#end
#local iBlade=lPatch/(nBlade-1);
#local s1=seed(rd);
#local zCount=0;
#while (zCount<nBlade)
#local xCount=0;
#while (xCount<nBlade)
#local posBlade=<xCount*iBlade,0,zCount*iBlade>+<iBlade*(0.5-rand(s1))*stdposBlade,0,iBlade*(0.5-rand(s1))*stdposBlade>;
#local rotBlade=ryBlade+(0.5-rand(s1))*stdrotBlade;
// #local lBladetmp=max(lBlade*0.3,lBlade+(0.5-rand(s1))*stdlBlade);
#local scBlade=max(0.5,(0.5-rand(s1))*stdBlade*2);
#local lBladetmp=lBlade*scBlade;
#local xBladeStart=wBlade*scBlade;
#local xBladeEnd=wBladeEnd*scBlade;
#local zBladeStart=xBladeStart*0.5;
#local vBendtmp=vBend + <(0.5-rand(s1))*0.3,0.5-rand(s1),rand(s1)>*stdBend;
MakeBlade(doSmooth,posBlade,rotBlade,segBlade,lBladetmp,xBladeStart,xBladeEnd,zBladeStart,startBend,vBendtmp,pwBend,dofold,dofile)
#warning concat("blade ",str(zCount*nBlade+xCount+1,0,0),"/",str(nBlade*nBlade,0,0),"\n")
#local xCount=xCount+1;
#end
#local zCount=zCount+1;
#end
#if(dofile = true)
#write (filehandle,"translate <",-lPatch/2,",0,",-lPatch/2,">}\n")
#fclose filehandle
#warning concat(fname," file created\n")
#else
translate <-lPatch/2,0,-lPatch/2>
}
#end
#end
// --------------------------------------
// End of the MakeGrassPatch macro
//==============================================
//===============================================
// MakePrairie macro
// --------------------------------------
// The MakePrairie macro creates a prairie by collating patches
// along the z axis, starting with nxPrairie patches and adding addPatches patches
// at each line, so that the prairie gets wider
// Because the patch is a mesh object, you can have multiple copies of it without
// running out of memory too soon
// --------------------------------------
/*
#declare lPatch=50; //size of individual patches
#declare nxPrairie=3; //number of patches for the first line
#declare addPatches=1; //number of patches to add at each line
#declare nzPrairie=5; //number of lines of patches
#declare objectPatch=GrassPatch; //patch object
#declare rd=seed(779); // random seed
#declare stdscale=1; // stddev of scale
#declare stdrotate=1; // stddev of rotation
#declare doTest=false; // replaces the patch with a sphere
// --------------------------------------
*/
//-----------------------------------------------------------------------------------
#macro MakePrairie( lPatch, // 50, // size of individual patches
nxPrairie, // 3, // number of patches for the first line
addPatches, // 1, // number of patches to add at each line
nzPrairie, // 5, // number of lines of patches
objectPatch,// GrassPatch, // the name of the patch object
rd, //779, // random seed
stdscale, // 1, // stddev of scale
stdrotate, // 1, // stddev of rotation
doTest // 0 or 1, // replaces the patch with a sphere
) //---------------------------------------------------------------
union{
#local zCount=0;
#local nxCounttmp=nxPrairie;
#local s2=seed(rd);
#while (zCount<nzPrairie)
#local xCount=0;
#while (xCount<nxCounttmp)
#if (doTest=true)
// sphere{<-nxCounttmp*0.5+xCount,0,zCount>*lPatch,lPatch*0.5 pigment{Red} scale <1,0.2,1>}
sphere{0,lPatch*0.5 pigment{Red} scale <1,0.2,1>
scale (1+stdscale*rand(s2)) rotate y*360*(0.5-rand(rd))*stdrotate
translate <xCount-(nxCounttmp-1)*0.5,0,zCount>*lPatch}
#else
object{ objectPatch
scale (1+stdscale*rand(s2))
rotate y*360*(0.5-rand(s2))*stdrotate
translate <-(nxCounttmp-1)*0.5+xCount,0,zCount>*lPatch}
#end
#local xCount=xCount+1;
#end
#local nxCounttmp=nxCounttmp+addPatches;
#local zCount=zCount+1;
#end
}
#end
//-----------------------------------------------
// End of MakePrairie macro
//===============================================
#version makegrass_Inc_Temp;
#end
// End of "makegrass.inc" -----------------------
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