celeritas::optical::EnteringSurfaceNormalSampler< Calculator > Class Template Reference

Sample a valid facet normal by wrapping a roughness sampler. More...

#include <SurfacePhysicsUtils.hh>

Public Member Functions
template<class... Args>
	EnteringSurfaceNormalSampler (Real3 const &dir, Real3 const &normal, Args &&... args)
template<class Engine >
Real3	operator() (Engine &rng)

Detailed Description

template<class Calculator>
class celeritas::optical::EnteringSurfaceNormalSampler< Calculator >

Sample a valid facet normal by wrapping a roughness sampler.

Some facet normal calculators might not produce surface normals valid for optical physics surface crossings (see is_entering_surface ). This functor will construct and repeatedly sample the distribution until the track is exiting the sampled facet normal.

Example

This uses a gaussian roughness distribution to accept only facets that have a direction where the track is exiting the sampled normal.

EnteringSurfaceNormalSampler<GaussianRoughnessSampler> sample_facet{
    track.geometry().dir(),
    s_phys.global_normal(),
    data.sigma_alpha[sub_model_id]};
auto rng = track.rng();
s_phys.facet_normal(sample_facet(rng));

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The documentation for this class was generated from the following file:

• SurfacePhysicsUtils.hh