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https://bitbucket.org/cosmicvoids/vide_public.git
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333 lines
7.8 KiB
C++
333 lines
7.8 KiB
C++
#include <cmath>
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#include <cassert>
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#include <iostream>
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#include <fstream>
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#include <string>
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#include <CosmoTool/loadSimu.hpp>
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#include <CosmoTool/loadRamses.hpp>
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#include <CosmoTool/interpolate.hpp>
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#include <CosmoTool/fortran.hpp>
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#include "generateMock_conf.h"
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#include "gslIntegrate.hpp"
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#include <netcdfcpp.h>
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using namespace std;
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using namespace CosmoTool;
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#define LIGHT_SPEED 299792.458
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SimuData *doLoadRamses(const char *basename, int baseid, int velAxis, bool goRedshift)
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{
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SimuData *d, *outd;
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d = loadRamsesSimu(basename, baseid, -1, 0);
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outd = new SimuData;
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outd->NumPart = d->TotalNumPart;
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outd->BoxSize = d->BoxSize;
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outd->TotalNumPart = outd->NumPart;
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outd->Hubble = d->Hubble;
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outd->Omega_Lambda = d->Omega_Lambda;
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outd->Omega_M = d->Omega_M;
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outd->time = d->time;
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for (int k = 0; k < 3; k++)
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outd->Pos[k] = new float[outd->NumPart];
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outd->Vel[2] = new float[outd->NumPart];
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delete d;
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int curCpu = 0;
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cout << "loading cpu 0 " << endl;
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while (d = loadRamsesSimu(basename, baseid, curCpu, NEED_POSITION|NEED_VELOCITY|NEED_GADGET_ID))
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{
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for (int k = 0; k < 3; k++)
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for (int i = 0; i < d->NumPart; i++)
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{
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assert(d->Id[i] >= 1);
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assert(d->Id[i] <= outd->TotalNumPart);
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outd->Pos[k][d->Id[i]-1] = d->Pos[k][i];
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outd->Vel[2][d->Id[i]-1] = d->Vel[velAxis][i];
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}
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if (goRedshift)
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for (int i = 0; i < d->NumPart; i++)
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outd->Pos[velAxis][d->Id[i]-1] += d->Vel[velAxis][i]/100.;
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delete d;
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curCpu++;
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cout << "loading cpu " << curCpu << endl;
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}
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return outd;
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}
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static double cubic(double a)
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{
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return a*a*a;
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}
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struct TotalExpansion
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{
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double Omega_M, Omega_L;
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double operator()(double z)
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{
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return 1/sqrt(Omega_M*cubic(1+z) + Omega_L);
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}
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};
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Interpolate make_cosmological_redshift(double OM, double OL, double z0, double z1, int N = 1000)
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{
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TotalExpansion e_computer;
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double D_tilde, Q, Qprime;
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InterpolatePairs pairs;
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e_computer.Omega_M = OM;
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e_computer.Omega_L = OL;
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pairs.resize(N);
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ofstream f("comoving_distance.txt");
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for (int i = 0; i < N; i++)
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{
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double z = z0 + (z1-z0)/N*i;
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pairs[i].second = z;
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pairs[i].first = gslIntegrate(e_computer, 0, z, 1e-3);
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f << z << " " << pairs[i].first << endl;
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}
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return buildFromVector(pairs);
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}
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void metricTransform(SimuData *data, int axis)
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{
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int x0, x1, x2;
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switch (axis) {
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case 0:
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x0 = 1; x1 = 2; x2 = 0;
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break;
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case 1:
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x0 = 0; x1 = 2; x2 = 1;
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break;
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case 2:
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x0 = 0; x1 = 1; x2 = 2;
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break;
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default:
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abort();
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}
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Interpolate z_vs_D = make_cosmological_redshift(data->Omega_M, data->Omega_Lambda, 0., 2.0); // Redshift 2 should be sufficient ?
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double z0 = 1/data->time - 1;
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TotalExpansion e_computer;
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double baseComovingDistance;
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cout << "Using base redshift z=" << z0 << endl;
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e_computer.Omega_M = data->Omega_M;
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e_computer.Omega_L = data->Omega_Lambda;
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baseComovingDistance = LIGHT_SPEED/100.* gslIntegrate(e_computer, 0, z0, 1e-3);
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cout << "Comoving distance = " << baseComovingDistance << " Mpc/h" << endl;
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for (uint32_t i = 0; i < data->NumPart; i++)
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{
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float& x = data->Pos[x0][i];
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float& y = data->Pos[x1][i];
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float& z = data->Pos[x2][i];
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float& v = data->Vel[2][i];
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double reduced_red = (z + baseComovingDistance)*100./LIGHT_SPEED;
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// Distorted redshift
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z = z_vs_D.compute(reduced_red)*LIGHT_SPEED/100.;
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// Add peculiar velocity
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z += v/100;
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}
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}
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void generateOutput(SimuData *data, int axis,
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const std::string& fname)
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{
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UnformattedWrite f(fname);
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cout << "Generating output particles to " << fname << endl;
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int x0, x1, x2;
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switch (axis) {
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case 0:
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x0 = 1; x1 = 2; x2 = 0;
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break;
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case 1:
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x0 = 0; x1 = 2; x2 = 1;
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break;
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case 2:
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x0 = 0; x1 = 1; x2 = 2;
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break;
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default:
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abort();
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}
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f.beginCheckpoint();
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f.writeInt32(data->NumPart);
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f.endCheckpoint();
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cout << "Writing X components..." << endl;
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f.beginCheckpoint();
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for (uint32_t i = 0; i < data->NumPart; i++)
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{
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f.writeReal32(data->Pos[x0][i]);
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}
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f.endCheckpoint();
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cout << "Writing Y components..." << endl;
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f.beginCheckpoint();
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for (uint32_t i = 0; i < data->NumPart; i++)
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{
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f.writeReal32(data->Pos[x1][i]);
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}
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f.endCheckpoint();
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cout << "Writing Z components..." << endl;
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f.beginCheckpoint();
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for (uint32_t i = 0; i < data->NumPart; i++)
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{
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f.writeReal32(data->Pos[x2][i]);
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}
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f.endCheckpoint();
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}
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void makeBox(SimuData *simu, SimuData *&boxed, generateMock_info& args_info)
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{
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uint32_t goodParticles = 0;
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double ranges[3][2] = {
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{ args_info.rangeX_min_arg, args_info.rangeX_max_arg },
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{ args_info.rangeY_min_arg, args_info.rangeY_max_arg },
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{ args_info.rangeZ_min_arg, args_info.rangeZ_max_arg }
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};
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double mul[3];
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int *particle_id;
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boxed = new SimuData;
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boxed->Hubble = simu->Hubble;
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boxed->Omega_M = simu->Omega_M;
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boxed->Omega_Lambda = simu->Omega_Lambda;
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boxed->time = simu->time;
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boxed->BoxSize = simu->BoxSize;
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for (uint32_t i = 0; i < simu->NumPart; i++)
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{
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bool acceptance = true;
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for (int j = 0; j < 3; j++)
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acceptance =
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acceptance &&
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(simu->Pos[j][i] > ranges[j][0]) &&
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(simu->Pos[j][i] < ranges[j][1]);
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if (acceptance)
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goodParticles++;
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}
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for (int j = 0; j < 3; j++)
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{
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boxed->Pos[j] = new float[goodParticles];
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boxed->Vel[j] = 0;
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mul[j] = 1.0/(ranges[j][1] - ranges[j][0]);
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}
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boxed->NumPart = goodParticles;
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particle_id = new int[goodParticles];
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uint32_t k = 0;
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for (uint32_t i = 0; i < simu->NumPart; i++)
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{
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bool acceptance = true;
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for (int j = 0; j < 3; j++)
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acceptance =
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acceptance &&
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(simu->Pos[j][i] > ranges[j][0]) &&
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(simu->Pos[j][i] < ranges[j][1]);
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if (acceptance)
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{
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for (int j = 0; j < 3; j++)
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{
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boxed->Pos[j][k] = (simu->Pos[j][i]-ranges[j][0])*mul[j];
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assert(boxed->Pos[j][k] > 0);
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assert(boxed->Pos[j][k] < 1);
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}
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particle_id[k] = i;
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k++;
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}
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}
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NcFile f(args_info.outputParameter_arg, NcFile::Replace);
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f.add_att("range_x_min", ranges[0][0]);
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f.add_att("range_x_max", ranges[0][1]);
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f.add_att("range_y_min", ranges[1][0]);
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f.add_att("range_y_max", ranges[1][1]);
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f.add_att("range_z_min", ranges[2][0]);
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f.add_att("range_z_max", ranges[2][1]);
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NcDim *NumPart_dim = f.add_dim("numpart_dim", boxed->NumPart);
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NcVar *v = f.add_var("particle_ids", ncInt, NumPart_dim);
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v->put(particle_id, boxed->NumPart);
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}
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int main(int argc, char **argv)
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{
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generateMock_info args_info;
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generateMock_conf_params args_params;
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SimuData *simu, *simuOut;
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generateMock_conf_init(&args_info);
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generateMock_conf_params_init(&args_params);
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args_params.check_required = 0;
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if (generateMock_conf_ext (argc, argv, &args_info, &args_params))
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return 1;
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if (!args_info.configFile_given)
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{
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if (generateMock_conf_required (&args_info, GENERATEMOCK_CONF_PACKAGE))
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return 1;
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}
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else
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{
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args_params.check_required = 1;
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args_params.initialize = 0;
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if (generateMock_conf_config_file (args_info.configFile_arg,
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&args_info,
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&args_params))
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return 1;
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}
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generateMock_conf_print_version();
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simu = doLoadRamses(args_info.ramsesBase_arg,
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args_info.ramsesId_arg,
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args_info.axis_arg, false);
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cout << "Hubble = " << simu->Hubble << endl;
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cout << "Boxsize = " << simu->BoxSize << endl;
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cout << "Omega_M = " << simu->Omega_M << endl;
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cout << "Omega_Lambda = " << simu->Omega_Lambda << endl;
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metricTransform(simu, args_info.axis_arg);
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makeBox(simu, simuOut, args_info);
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delete simu;
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generateOutput(simuOut, args_info.axis_arg, args_info.output_arg);
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delete simuOut;
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return 0;
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}
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