mirror of
https://github.com/cosmo-sims/MUSIC.git
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240 lines
6.7 KiB
C++
240 lines
6.7 KiB
C++
#include <vector>
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/*
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region_multibox.cc - A plugin for MUSIC -
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a code to generate multi-scale initial conditions
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for cosmological simulations
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Copyright (C) 2015 Ben Keller
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*/
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#include <iostream>
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#include <cmath>
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#include <cassert>
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#include <fstream>
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#include <sstream>
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#include <cctype>
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#include <algorithm>
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#include "region_generator.hh"
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#include "point_file_reader.hh"
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typedef std::vector<unsigned> col;
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typedef std::vector<col> slice;
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typedef std::vector<slice> grid;
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typedef struct {
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unsigned x;
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unsigned y;
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unsigned z;
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} coord;
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typedef std::vector<coord> region;
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class region_multibox_plugin : public region_generator_plugin{
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private:
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double cen[3];
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unsigned res;
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double vfac_;
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grid refgrid;
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region where(unsigned level)
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{
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slice curslice;
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col curcol;
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region equal_region;
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coord cp;
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for(unsigned i=0;i<refgrid.size();i++)
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{
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cp.x = i;
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curslice = refgrid[i];
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for(unsigned j=0;j<curslice.size();j++)
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{
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cp.y = j;
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curcol = curslice[j];
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for(unsigned k=0;k<curcol.size();k++)
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{
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cp.z = k;
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if(curcol[k] == level)
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{
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equal_region.push_back(cp);
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}
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}
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}
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}
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return equal_region;
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}
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//This function takes the grid, a vector of doubles containing the particle
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//coordinates, and sets each particle-containing gridcell to levelmax_.
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void deposit_particles(std::vector<double> pp, unsigned res)
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{
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unsigned i,j,k;
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std::vector<double>::iterator cp = pp.begin();
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while(cp != pp.end())
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{
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i = (*(cp))*res;
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cp++;
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j = (*(cp))*res;
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cp++;
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k = (*(cp))*res;
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cp++;
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refgrid[i][j][k] = levelmax_;
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}
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}
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//This function takes the grid, which has been already had particles
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//deposited onto it, and set to the maximum refinement level. It then
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//fills the remaining refinement levels
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void build_refgrid()
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{
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region curregion;
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for(unsigned curlevel=levelmax_; curlevel>(levelmin_+1); curlevel--)
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{
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curregion = where(curlevel);
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for(region::iterator cp= curregion.begin(); cp != curregion.end(); ++cp)
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{
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for(int i=-1; i<2; i++)
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{
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for(int j=-1; j<2; j++)
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{
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for(int k=-1; k<2; k++)
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{
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if(refgrid[cp->x+i][cp->y+j][cp->z+k] == levelmin_)
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{
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refgrid[cp->x+i][cp->y+j][cp->z+k] = curlevel-1;
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}
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}
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}
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}
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}
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}
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}
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public:
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explicit region_multibox_plugin( config_file& cf )
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: region_generator_plugin( cf )
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{
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res = 1<<(levelmin_-1);
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//check parameters
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if ( !cf.containsKey("setup", "region_point_file"))
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{
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LOGERR("Missing parameter \'region_point_file\' needed for region=multibox");
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throw std::runtime_error("Missing parameter for region=multibox");
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}
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if ( cf.containsKey("setup", "region_point_level"))
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{
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res = 1<<(levelmin_-1);
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res = 1<<(cf.getValue<int>("setup","region_point_level")-1);
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}
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vfac_ = cf.getValue<double>("cosmology","vfact");
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if (levelmin_ >= levelmax_)
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{
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LOGERR("Why are you specifying a region if you aren't refining?");
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throw std::runtime_error("region=multibox needs levelmax>levelmin");
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}
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std::vector<double> pp;
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point_reader pfr;
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pfr.read_points_from_file(cf.getValue<std::string>("setup", "region_point_file"), vfac_, pp);
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LOGINFO("Multibox Resolution: %d", res);
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//Initialize the grid with zeros, the base level
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refgrid = grid(res,slice(res,col(res,levelmin_)));
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//Build the highest refinement region
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deposit_particles(pp, res);
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LOGINFO("Deposited Multigrid Particles");
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//Build the intermediate refinement regions
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build_refgrid();
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LOGINFO("Built Multigrid");
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get_center(cen);
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dump_grid();
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}
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void get_AABB( double *left, double *right, unsigned level )
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{
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left[0] = left[1] = left[2] = 1.0;
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right[0] = right[1] = right[2] = 0.0;
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if( level <= levelmin_ )
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{
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left[0] = left[1] = left[2] = 0.0;
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right[0] = right[1] = right[2] = 1.0;
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return;
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}
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region myres = where(level);
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std::vector<coord>::iterator cp = myres.begin();
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while (cp != myres.end())
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{
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//Check left side
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if (float(cp->x)/res < left[0])
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left[0] = float(cp->x)/res;
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if (float(cp->y)/res < left[1])
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left[1] = float(cp->y)/res;
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if (float(cp->z)/res < left[2])
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left[2] = float(cp->z)/res;
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//Check right side
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if (float(cp->x)/res > right[0])
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right[0] = float(cp->x)/res;
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if (float(cp->y)/res > right[1])
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right[1] = float(cp->y)/res;
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if (float(cp->z)/res > right[2])
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right[2] = float(cp->z)/res;
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cp++;
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}
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}
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void dump_grid()
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{
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FILE * gridfile = fopen("griddump.dat", "w");
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for(unsigned i=0;i<res;i++)
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{
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for(unsigned j=0; j<res; j++)
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{
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for(unsigned k=0;k<res;k++)
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{
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fprintf(gridfile, "%03d %03d %03d %1d\n", i-int(res*cen[0]),j-int(res*cen[1]),k-int(res*cen[2]), refgrid[i][j][k]);
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}
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}
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}
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fclose(gridfile);
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}
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void update_AABB( double *left, double *right )
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{
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//no need for this I think?
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}
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bool query_point( double *x, int level )
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{
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for(int i=0; i<3; ++i)
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{
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if(x[i] >= 1.0 || x[i] <= 0.0) return false;
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}
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return (level <= int(refgrid[(x[0])*res][(x[1])*res][(x[2])*res]));
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}
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bool is_grid_dim_forced( size_t* ndims )
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{
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return false; //is this true?
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}
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void get_center( double *xc )
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{
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double xc2[3];
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get_AABB(xc, xc2, levelmax_);
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for(int i=0; i<3; ++i)
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{
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xc[i] += xc2[i];
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xc[i] *= 0.5;
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}
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}
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void get_center_unshifted( double *xc )
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{
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get_center(xc);
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}
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};
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namespace{
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region_generator_plugin_creator_concrete< region_multibox_plugin > creator("multibox");
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}
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