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ref: update random scatter only when material is non-zero #967

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Merged
niermann999 merged 1 commit into from
Apr 28, 2025
Merged

ref: update random scatter only when material is non-zero #967

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50 changes: 26 additions & 24 deletions tests/include/detray/test/utils/simulation/random_scatterer.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -149,30 +149,32 @@ struct random_scatterer : actor {
bound_params.dir(),
bound_params.bound_local())};

sf.template visit_material<kernel>(simulator_state, ptc, bound_params,
cos_inc_angle,
bound_params.bound_local()[0]);

// Get the new momentum
const auto new_mom =
attenuate(simulator_state.e_loss_mpv, simulator_state.e_loss_sigma,
ptc.mass(), bound_params.p(ptc.charge()),
simulator_state.generator);

// Update Qop
bound_params.set_qop(ptc.charge() / new_mom);

// Get the new direction from random scattering
const auto new_dir = scatter(bound_params.dir(),
simulator_state.projected_scattering_angle,
simulator_state.generator);

// Update Phi and Theta
stepping.bound_params().set_phi(vector::phi(new_dir));
stepping.bound_params().set_theta(vector::theta(new_dir));

// Flag renavigation of the current candidate
prop_state._navigation.set_high_trust();
const bool success = sf.template visit_material<kernel>(
simulator_state, ptc, bound_params, cos_inc_angle,
bound_params.bound_local()[0]);

if (success) {
// Get the new momentum
const auto new_mom = attenuate(
simulator_state.e_loss_mpv, simulator_state.e_loss_sigma,
ptc.mass(), bound_params.p(ptc.charge()),
simulator_state.generator);

// Update Qop
bound_params.set_qop(ptc.charge() / new_mom);

// Get the new direction from random scattering
const auto new_dir = scatter(
bound_params.dir(), simulator_state.projected_scattering_angle,
simulator_state.generator);

// Update Phi and Theta
stepping.bound_params().set_phi(vector::phi(new_dir));
stepping.bound_params().set_theta(vector::theta(new_dir));

// Flag renavigation of the current candidate
prop_state._navigation.set_high_trust();
}
}

/// @brief Get the new momentum from the landau distribution
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