25077859049

Committed 28 Apr 2026 09:10PM UTC coverage: 81.374%. First build

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Local adjoint source for Random Ray (#3717)

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/src/random_ray/random_ray_simulation.cpp

#include "openmc/random_ray/random_ray_simulation.h"

#include "openmc/capi.h"
#include "openmc/eigenvalue.h"
#include "openmc/geometry.h"
#include "openmc/message_passing.h"
#include "openmc/mgxs_interface.h"
#include "openmc/output.h"
#include "openmc/plot.h"
#include "openmc/random_ray/flat_source_domain.h"
#include "openmc/random_ray/random_ray.h"
#include "openmc/simulation.h"
#include "openmc/source.h"
#include "openmc/tallies/filter.h"
#include "openmc/tallies/tally.h"
#include "openmc/tallies/tally_scoring.h"
#include "openmc/timer.h"
#include "openmc/weight_windows.h"

namespace openmc {

//==============================================================================
// Non-member functions
//==============================================================================

// Enforces restrictions on inputs in random ray mode.  While there are
// many features that don't make sense in random ray mode, and are therefore
// unsupported, we limit our testing/enforcement operations only to inputs
// that may cause erroneous/misleading output or crashes from the solver.
void validate_random_ray_inputs()
{
  // Validate tallies
  ///////////////////////////////////////////////////////////////////
  for (auto& tally : model::tallies) {

    // Validate score types
    for (auto score_bin : tally->scores_) {
      switch (score_bin) {
      case SCORE_FLUX:
      case SCORE_TOTAL:
      case SCORE_FISSION:
      case SCORE_NU_FISSION:
      case SCORE_EVENTS:
      case SCORE_KAPPA_FISSION:
        break;
      default:
        fatal_error(
          "Invalid score specified. Only flux, total, fission, nu-fission, "
          "kappa-fission, and event scores are supported in random ray mode.");
      }
    }

    // Validate filter types
    for (auto f : tally->filters()) {
      auto& filter = *model::tally_filters[f];

      switch (filter.type()) {
      case FilterType::CELL:
      case FilterType::CELL_INSTANCE:
      case FilterType::DISTRIBCELL:
      case FilterType::ENERGY:
      case FilterType::MATERIAL:
      case FilterType::MESH:
      case FilterType::UNIVERSE:
      case FilterType::PARTICLE:
        break;
      default:
        fatal_error("Invalid filter specified. Only cell, cell_instance, "
                    "distribcell, energy, material, mesh, and universe filters "
                    "are supported in random ray mode.");
      }
    }
  }

  // Validate MGXS data
  ///////////////////////////////////////////////////////////////////
  for (auto& material : data::mg.macro_xs_) {
    if (!material.is_isotropic) {
      fatal_error("Anisotropic MGXS detected. Only isotropic XS data sets "
                  "supported in random ray mode.");
    }
    for (int g = 0; g < data::mg.num_energy_groups_; g++) {
      if (material.exists_in_model) {
        // Temperature and angle indices, if using multiple temperature
        // data sets and/or anisotropic data sets.
        // TODO: Currently assumes we are only using single temp/single angle
        // data.
        const int t = 0;
        const int a = 0;
        double sigma_t =
          material.get_xs(MgxsType::TOTAL, g, NULL, NULL, NULL, t, a);
        if (sigma_t <= 0.0) {
          fatal_error("No zero or negative total macroscopic cross sections "
                      "allowed in random ray mode. If the intention is to make "
                      "a void material, use a cell fill of 'None' instead.");
        }
      }
    }
  }

  // Validate ray source
  ///////////////////////////////////////////////////////////////////

  // Check for independent source
  IndependentSource* is =
    dynamic_cast<IndependentSource*>(RandomRay::ray_source_.get());
  if (!is) {
    fatal_error("Invalid ray source definition. Ray source must provided and "
                "be of type IndependentSource.");
  }

  // Check for box source
  SpatialDistribution* space_dist = is->space();
  SpatialBox* sb = dynamic_cast<SpatialBox*>(space_dist);
  if (!sb) {
    fatal_error(
      "Invalid ray source definition -- only box sources are allowed.");
  }

  // Check that box source is not restricted to fissionable areas
  if (sb->only_fissionable()) {
    fatal_error(
      "Invalid ray source definition -- fissionable spatial distribution "
      "not allowed.");
  }

  // Check for isotropic source
  UnitSphereDistribution* angle_dist = is->angle();
  Isotropic* id = dynamic_cast<Isotropic*>(angle_dist);
  if (!id) {
    fatal_error("Invalid ray source definition -- only isotropic sources are "
                "allowed.");
  }

  // Validate external sources
  ///////////////////////////////////////////////////////////////////
  if (settings::run_mode == RunMode::FIXED_SOURCE) {
    if (model::external_sources.size() < 1) {
      fatal_error("Must provide a particle source (in addition to ray source) "
                  "in fixed source random ray mode.");
    }

    for (int i = 0; i < model::external_sources.size(); i++) {
      Source* s = model::external_sources[i].get();

      // Check for independent source
      IndependentSource* is = dynamic_cast<IndependentSource*>(s);

      if (!is) {
        fatal_error(
          "Only IndependentSource external source types are allowed in "
          "random ray mode");
      }

      // Check for isotropic source
      UnitSphereDistribution* angle_dist = is->angle();
      Isotropic* id = dynamic_cast<Isotropic*>(angle_dist);
      if (!id) {
        fatal_error(
          "Invalid source definition -- only isotropic external sources are "
          "allowed in random ray mode.");
      }

      // Validate that a domain ID was specified OR that it is a point source
      auto sp = dynamic_cast<SpatialPoint*>(is->space());
      if (is->domain_ids().size() == 0 && !sp) {
        fatal_error("Fixed sources must be point source or spatially "
                    "constrained by domain id (cell, material, or universe) in "
                    "random ray mode.");
      } else if (is->domain_ids().size() > 0 && sp) {
        // If both a domain constraint and a point source location are
        // specified, notify user that domain constraint takes precedence.
        warning("Fixed source has both a domain constraint and a point "
                "type spatial distribution. The domain constraint takes "
                "precedence in random ray mode -- point source coordinate "
                "will be ignored.");
      }

      // Check that a discrete energy distribution was used
      Distribution* d = is->energy();
      Discrete* dd = dynamic_cast<Discrete*>(d);
      if (!dd) {
        fatal_error(
          "Only discrete (multigroup) energy distributions are allowed for "
          "external sources in random ray mode.");
      }
    }
  }

  // Validate adjoint sources
  ///////////////////////////////////////////////////////////////////
  if (FlatSourceDomain::adjoint_ && !model::adjoint_sources.empty()) {
    for (int i = 0; i < model::adjoint_sources.size(); i++) {
      Source* s = model::adjoint_sources[i].get();

      // Check for independent source
      IndependentSource* is = dynamic_cast<IndependentSource*>(s);

      if (!is) {
        fatal_error(
          "Only IndependentSource adjoint source types are allowed in "
          "random ray mode");
      }

      // Check for isotropic source
      UnitSphereDistribution* angle_dist = is->angle();
      Isotropic* id = dynamic_cast<Isotropic*>(angle_dist);
      if (!id) {
        fatal_error(
          "Invalid source definition -- only isotropic adjoint sources are "
          "allowed in random ray mode.");
      }

      // Validate that a domain ID was specified OR that it is a point source
      auto sp = dynamic_cast<SpatialPoint*>(is->space());
      if (is->domain_ids().size() == 0 && !sp) {
        fatal_error("Adjoint sources must be point source or spatially "
                    "constrained by domain id (cell, material, or universe) in "
                    "random ray mode.");
      } else if (is->domain_ids().size() > 0 && sp) {
        // If both a domain constraint and a point source location are
        // specified, notify user that domain constraint takes precedence.
        warning("Adjoint source has both a domain constraint and a point "
                "type spatial distribution. The domain constraint takes "
                "precedence in random ray mode -- point source coordinate "
                "will be ignored.");
      }

      // Check that a discrete energy distribution was used
      Distribution* d = is->energy();
      Discrete* dd = dynamic_cast<Discrete*>(d);
      if (!dd) {
        fatal_error(
          "Only discrete (multigroup) energy distributions are allowed for "
          "adjoint sources in random ray mode.");
      }
    }
  }

  // Validate plotting files
  ///////////////////////////////////////////////////////////////////
  for (int p = 0; p < model::plots.size(); p++) {

    // Get handle to OpenMC plot object
    const auto& openmc_plottable = model::plots[p];
    Plot* openmc_plot = dynamic_cast<Plot*>(openmc_plottable.get());

    // Random ray plots only support voxel plots
    if (!openmc_plot) {
      warning(fmt::format(
        "Plot {} will not be used for end of simulation data plotting -- only "
        "voxel plotting is allowed in random ray mode.",
        openmc_plottable->id()));
      continue;
    } else if (openmc_plot->type_ != Plot::PlotType::voxel) {
      warning(fmt::format(
        "Plot {} will not be used for end of simulation data plotting -- only "
        "voxel plotting is allowed in random ray mode.",
        openmc_plottable->id()));
      continue;
    }
  }

  // Warn about slow MPI domain replication, if detected
  ///////////////////////////////////////////////////////////////////
#ifdef OPENMC_MPI
  if (mpi::n_procs > 1) {
    warning(
      "MPI parallelism is not supported by the random ray solver. All work "
      "will be performed by rank 0. Domain decomposition may be implemented in "
      "the future to provide efficient MPI scaling.");
  }
#endif

  // Warn about instability resulting from linear sources in small regions
  // when generating weight windows with FW-CADIS and an overlaid mesh.
  ///////////////////////////////////////////////////////////////////
  if (RandomRay::source_shape_ == RandomRaySourceShape::LINEAR &&
      variance_reduction::weight_windows.size() > 0) {
    warning(
      "Linear sources may result in negative fluxes in small source regions "
      "generated by mesh subdivision. Negative sources may result in low "
      "quality FW-CADIS weight windows. We recommend you use flat source "
      "mode when generating weight windows with an overlaid mesh tally.");
  }
}

void openmc_finalize_random_ray()
{
  FlatSourceDomain::volume_estimator_ = RandomRayVolumeEstimator::HYBRID;
  FlatSourceDomain::volume_normalized_flux_tallies_ = false;
  FlatSourceDomain::adjoint_ = false;
  FlatSourceDomain::fw_cadis_local_ = false;
  FlatSourceDomain::fw_cadis_local_targets_.clear();
  FlatSourceDomain::mesh_domain_map_.clear();
  RandomRay::ray_source_.reset();
  RandomRay::source_shape_ = RandomRaySourceShape::FLAT;
  RandomRay::sample_method_ = RandomRaySampleMethod::PRNG;
}

//==============================================================================
// RandomRaySimulation implementation
//==============================================================================

RandomRaySimulation::RandomRaySimulation()
  : negroups_(data::mg.num_energy_groups_)
{
  // There are no source sites in random ray mode, so be sure to disable to
  // ensure we don't attempt to write source sites to statepoint
  settings::source_write = false;

  // Random ray mode does not have an inner loop over generations within a
  // batch, so set the current gen to 1
  simulation::current_gen = 1;

  switch (RandomRay::source_shape_) {
  case RandomRaySourceShape::FLAT:
    domain_ = make_unique<FlatSourceDomain>();
    break;
  case RandomRaySourceShape::LINEAR:
  case RandomRaySourceShape::LINEAR_XY:
    domain_ = make_unique<LinearSourceDomain>();
    break;
  default:
    fatal_error("Unknown random ray source shape");
  }

  // Convert OpenMC native MGXS into a more efficient format
  // internal to the random ray solver
  domain_->flatten_xs();
}

void RandomRaySimulation::apply_fixed_sources_and_mesh_domains()
{
  domain_->apply_meshes();
  if (settings::run_mode == RunMode::FIXED_SOURCE) {
    // Transfer external source user inputs onto random ray source regions
    domain_->convert_external_sources(false);
    domain_->count_external_source_regions();
  }
}

void RandomRaySimulation::prepare_fw_fixed_sources_adjoint()
{
  // Prepare adjoint fixed sources using forward flux
  domain_->source_regions_.adjoint_reset();
  if (settings::run_mode == RunMode::FIXED_SOURCE) {
    domain_->set_fw_adjoint_sources();
  }
}

void RandomRaySimulation::prepare_local_fixed_sources_adjoint()
{
  if (settings::run_mode == RunMode::FIXED_SOURCE) {
    domain_->set_local_adjoint_sources();
  }
}

void RandomRaySimulation::prepare_adjoint_simulation(bool fw_adjoint)
{
  reset_timers();

  if (mpi::master)
    header("ADJOINT FLUX SOLVE", 3);

  if (fw_adjoint) {
    // Forward simulation has already been run;
    // Configure the domain for adjoint simulation and
    // re-initialize OpenMC general data structures
    FlatSourceDomain::adjoint_ = true;

    openmc_simulation_init();

    prepare_fw_fixed_sources_adjoint();
  } else {
    // Initialize adjoint fixed sources
    domain_->apply_meshes();
    prepare_local_fixed_sources_adjoint();
    domain_->count_external_source_regions();
  }

  domain_->k_eff_ = 1.0;

  // Transpose scattering matrix
  domain_->transpose_scattering_matrix();

  // Swap nu_sigma_f and chi
  domain_->nu_sigma_f_.swap(domain_->chi_);
}

void RandomRaySimulation::simulate()
{
  // Begin main simulation timer
  simulation::time_total.start();

  // Random ray power iteration loop
  while (simulation::current_batch < settings::n_batches) {
    // Initialize the current batch
    initialize_batch();
    initialize_generation();

    // MPI not supported in random ray solver, so all work is done by rank 0
    // TODO: Implement domain decomposition for MPI parallelism
    if (mpi::master) {

      // Reset total starting particle weight used for normalizing tallies
      simulation::total_weight = 1.0;

      // Update source term (scattering + fission)
      domain_->update_all_neutron_sources();

      // Reset scalar fluxes, iteration volume tallies, and region hit flags
      // to zero
      domain_->batch_reset();

      // At the beginning of the simulation, if mesh subdivision is in use, we
      // need to swap the main source region container into the base container,
      // as the main source region container will be used to hold the true
      // subdivided source regions. The base container will therefore only
      // contain the external source region information, the mesh indices,
      // material properties, and initial guess values for the flux/source.

      // Start timer for transport
      simulation::time_transport.start();

// Transport sweep over all random rays for the iteration
#pragma omp parallel for schedule(dynamic)                                     \
  reduction(+ : total_geometric_intersections_)
      for (int i = 0; i < settings::n_particles; i++) {
        RandomRay ray(i, domain_.get());
        total_geometric_intersections_ +=
          ray.transport_history_based_single_ray();
      }

      simulation::time_transport.stop();

      // Add any newly discovered source regions to the main source region
      // container.
      domain_->finalize_discovered_source_regions();

      // Normalize scalar flux and update volumes
      domain_->normalize_scalar_flux_and_volumes(
        settings::n_particles * RandomRay::distance_active_);

      // Add source to scalar flux, compute number of FSR hits
      int64_t n_hits = domain_->add_source_to_scalar_flux();

      // Apply transport stabilization factors
      domain_->apply_transport_stabilization();

      if (settings::run_mode == RunMode::EIGENVALUE) {
        // Compute random ray k-eff
        domain_->compute_k_eff();

        // Store random ray k-eff into OpenMC's native k-eff variable
        global_tally_tracklength = domain_->k_eff_;
      }

      // Execute all tallying tasks, if this is an active batch
      if (simulation::current_batch > settings::n_inactive) {

        // Add this iteration's scalar flux estimate to final accumulated
        // estimate
        domain_->accumulate_iteration_flux();

        // Use above mapping to contribute FSR flux data to appropriate
        // tallies
        domain_->random_ray_tally();
      }

      // Set phi_old = phi_new
      domain_->flux_swap();

      // Check for any obvious insabilities/nans/infs
      instability_check(n_hits, domain_->k_eff_, avg_miss_rate_);
    } // End MPI master work

    // Finalize the current batch
    finalize_generation();
    finalize_batch();
  } // End random ray power iteration loop

  domain_->count_external_source_regions();

  // End main simulation timer
  simulation::time_total.stop();

  // Normalize and save the final forward flux
  double source_normalization_factor =
    domain_->compute_fixed_source_normalization_factor() /
    (settings::n_batches - settings::n_inactive);

#pragma omp parallel for
  for (uint64_t se = 0; se < domain_->n_source_elements(); se++) {
    domain_->source_regions_.scalar_flux_final(se) *=
      source_normalization_factor;
  }

  // Finalize OpenMC
  openmc_simulation_finalize();

  // Output all simulation results
  output_simulation_results();
}

void RandomRaySimulation::output_simulation_results() const
{
  // Print random ray results
  if (mpi::master) {
    print_results_random_ray(total_geometric_intersections_,
      avg_miss_rate_ / settings::n_batches, negroups_,
      domain_->n_source_regions(), domain_->n_external_source_regions_);
    if (model::plots.size() > 0) {
      domain_->output_to_vtk();
    }
  }
}

// Apply a few sanity checks to catch obvious cases of numerical instability.
// Instability typically only occurs if ray density is extremely low.
void RandomRaySimulation::instability_check(
  int64_t n_hits, double k_eff, double& avg_miss_rate) const
{
  double percent_missed = ((domain_->n_source_regions() - n_hits) /
                            static_cast<double>(domain_->n_source_regions())) *
                          100.0;
  avg_miss_rate += percent_missed;

  if (mpi::master) {
    if (percent_missed > 10.0) {
      warning(fmt::format(
        "Very high FSR miss rate detected ({:.3f}%). Instability may occur. "
        "Increase ray density by adding more rays and/or active distance.",
        percent_missed));
    } else if (percent_missed > 1.0) {
      warning(
        fmt::format("Elevated FSR miss rate detected ({:.3f}%). Increasing "
                    "ray density by adding more rays and/or active "
                    "distance may improve simulation efficiency.",
          percent_missed));
    }

    if (k_eff > 10.0 || k_eff < 0.01 || !(std::isfinite(k_eff))) {
      fatal_error(fmt::format("Instability detected: k-eff = {:.5f}", k_eff));
    }
  }
}

// Print random ray simulation results
void RandomRaySimulation::print_results_random_ray(
  uint64_t total_geometric_intersections, double avg_miss_rate, int negroups,
  int64_t n_source_regions, int64_t n_external_source_regions) const
{
  using namespace simulation;

  if (settings::verbosity >= 6) {
    double total_integrations = total_geometric_intersections * negroups;
    double time_per_integration =
      simulation::time_transport.elapsed() / total_integrations;
    double misc_time = time_total.elapsed() - time_update_src.elapsed() -
                       time_transport.elapsed() - time_tallies.elapsed() -
                       time_bank_sendrecv.elapsed();

    header("Simulation Statistics", 4);
    fmt::print(
      " Total Iterations                  = {}\n", settings::n_batches);
    fmt::print(
      " Number of Rays per Iteration      = {}\n", settings::n_particles);
    fmt::print(" Inactive Distance                 = {} cm\n",
      RandomRay::distance_inactive_);
    fmt::print(" Active Distance                   = {} cm\n",
      RandomRay::distance_active_);
    fmt::print(" Source Regions (SRs)              = {}\n", n_source_regions);
    fmt::print(
      " SRs Containing External Sources   = {}\n", n_external_source_regions);
    fmt::print(" Total Geometric Intersections     = {:.4e}\n",
      static_cast<double>(total_geometric_intersections));
    fmt::print("   Avg per Iteration               = {:.4e}\n",
      static_cast<double>(total_geometric_intersections) / settings::n_batches);
    fmt::print("   Avg per Iteration per SR        = {:.2f}\n",
      static_cast<double>(total_geometric_intersections) /
        static_cast<double>(settings::n_batches) / n_source_regions);
    fmt::print(" Avg SR Miss Rate per Iteration    = {:.4f}%\n", avg_miss_rate);
    fmt::print(" Energy Groups                     = {}\n", negroups);
    fmt::print(
      " Total Integrations                = {:.4e}\n", total_integrations);
    fmt::print("   Avg per Iteration               = {:.4e}\n",
      total_integrations / settings::n_batches);

    std::string estimator;
    switch (domain_->volume_estimator_) {
    case RandomRayVolumeEstimator::SIMULATION_AVERAGED:
      estimator = "Simulation Averaged";
      break;
    case RandomRayVolumeEstimator::NAIVE:
      estimator = "Naive";
      break;
    case RandomRayVolumeEstimator::HYBRID:
      estimator = "Hybrid";
      break;
    default:
      fatal_error("Invalid volume estimator type");
    }
    fmt::print(" Volume Estimator Type             = {}\n", estimator);

    std::string adjoint_true = (FlatSourceDomain::adjoint_) ? "ON" : "OFF";
    fmt::print(" Adjoint Flux Mode                 = {}\n", adjoint_true);

    std::string shape;
    switch (RandomRay::source_shape_) {
    case RandomRaySourceShape::FLAT:
      shape = "Flat";
      break;
    case RandomRaySourceShape::LINEAR:
      shape = "Linear";
      break;
    case RandomRaySourceShape::LINEAR_XY:
      shape = "Linear XY";
      break;
    default:
      fatal_error("Invalid random ray source shape");
    }
    fmt::print(" Source Shape                      = {}\n", shape);
    std::string sample_method;
    switch (RandomRay::sample_method_) {
    case RandomRaySampleMethod::PRNG:
      sample_method = "PRNG";
      break;
    case RandomRaySampleMethod::HALTON:
      sample_method = "Halton";
      break;
    case RandomRaySampleMethod::S2:
      sample_method = "PRNG S2";
      break;
    }
    fmt::print(" Sample Method                     = {}\n", sample_method);

    if (domain_->is_transport_stabilization_needed_) {
      fmt::print(" Transport XS Stabilization Used   = YES (rho = {:.3f})\n",
        FlatSourceDomain::diagonal_stabilization_rho_);
    } else {
      fmt::print(" Transport XS Stabilization Used   = NO\n");
    }

    header("Timing Statistics", 4);
    show_time("Total time for initialization", time_initialize.elapsed());
    show_time("Reading cross sections", time_read_xs.elapsed(), 1);
    show_time("Total simulation time", time_total.elapsed());
    show_time("Transport sweep only", time_transport.elapsed(), 1);
    show_time("Source update only", time_update_src.elapsed(), 1);
    show_time("Tally conversion only", time_tallies.elapsed(), 1);
    show_time("MPI source reductions only", time_bank_sendrecv.elapsed(), 1);
    show_time("Other iteration routines", misc_time, 1);
    if (settings::run_mode == RunMode::EIGENVALUE) {
      show_time("Time in inactive batches", time_inactive.elapsed());
    }
    show_time("Time in active batches", time_active.elapsed());
    show_time("Time writing statepoints", time_statepoint.elapsed());
    show_time("Total time for finalization", time_finalize.elapsed());
    show_time("Time per integration", time_per_integration);
  }

  if (settings::verbosity >= 4 && settings::run_mode == RunMode::EIGENVALUE) {
    header("Results", 4);
    fmt::print(" k-effective                       = {:.5f} +/- {:.5f}\n",
      simulation::keff, simulation::keff_std);
  }
}

} // namespace openmc

//==============================================================================
// C API functions
//==============================================================================

void openmc_run_random_ray()
{
  //////////////////////////////////////////////////////////
  // Run forward simulation
  //////////////////////////////////////////////////////////

  // Check if adjoint calculation is needed, and if local adjoint source(s)
  // are present. If an adjoint calculation is needed and no sources are
  // specified, we will run a forward calculation first to calculate adjoint
  // sources for global variance reduction, then perform an adjoint
  // calculation later.
  bool adjoint_needed = openmc::FlatSourceDomain::adjoint_;
  bool fw_adjoint = openmc::model::adjoint_sources.empty() && adjoint_needed;

  // If we're going to do an adjoint simulation with forward-weighted adjoint
  // sources afterwards, report that this is the initial forward flux solve.
  if (!adjoint_needed || fw_adjoint) {
    // Configure the domain for forward simulation
    openmc::FlatSourceDomain::adjoint_ = false;

    if (adjoint_needed && openmc::mpi::master)
      openmc::header("FORWARD FLUX SOLVE", 3);
  } else {
    // Configure domain for adjoint simulation (later)
    openmc::FlatSourceDomain::adjoint_ = true;
  }

  // Initialize OpenMC general data structures
  openmc_simulation_init();

  // Validate that inputs meet requirements for random ray mode
  if (openmc::mpi::master)
    openmc::validate_random_ray_inputs();

  // Initialize Random Ray Simulation Object
  openmc::RandomRaySimulation sim;

  if (!adjoint_needed || fw_adjoint) {
    // Initialize fixed sources, if present
    sim.apply_fixed_sources_and_mesh_domains();

    // Execute random ray simulation
    sim.simulate();
  }

  //////////////////////////////////////////////////////////
  // Run adjoint simulation (if enabled)
  //////////////////////////////////////////////////////////

  if (!adjoint_needed) {
    return;
  }

  // Setup for adjoint simulation
  sim.prepare_adjoint_simulation(fw_adjoint);

  // Execute random ray simulation
  sim.simulate();
}

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