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Add gaussian broadening to SLIT source #214

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Mar 10, 2024
Merged

Add gaussian broadening to SLIT source #214

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23 changes: 23 additions & 0 deletions src/mcx_core.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -1462,6 +1462,29 @@ __device__ inline int launchnewphoton(MCXpos* p, MCXdir* v, Stokes* s, MCXtime*
rotatevector(v, 1.f, 0.f, sphi, cphi);
}

if (MCX_SRC_SLIT && (launchsrc->param2.x > 0.f || launchsrc->param2.y > 0.f)) {
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the first condition should be gcfg->srctype == MCX_SRC_SLIT. I will post my fix, just leave here for a note.

float sphi, cphi;
r = TWO_PI * rand_uniform01(t);
sincosf(r, &sphi, &cphi);
r = sqrtf(2.f * rand_next_scatlen(t));
// gaussian broadening factor in direction perpendicular to both slit and v directions
float gauss_perp = launchsrc->param2.x * r * cphi;
// gaussian broadening factor in direction of slit
float gauss_parallel = launchsrc->param2.y * r * sphi;
float parallel_norm = rnorm3df(launchsrc->param1.x, launchsrc->param1.y, launchsrc->param1.z);
float3 perp = float3(launchsrc->param1.y * v->z - launchsrc->param1.z * v->y,
launchsrc->param1.z * v->x - launchsrc->param1.x * v->z,
launchsrc->param1.x * v->y - launchsrc->param1.y * v->x);
float perp_norm = rnorm3df(perp.x, perp.y, perp.z);
v->x += gauss_perp * perp.x * perp_norm + gauss_parallel * launchsrc->param1.x * parallel_norm;
v->y += gauss_perp * perp.y * perp_norm + gauss_parallel * launchsrc->param1.y * parallel_norm;
v->z += gauss_perp * perp.z * perp_norm + gauss_parallel * launchsrc->param1.z * parallel_norm;
r = rnorm3df(v->x, v->y, v->z);
v->x *= r;
v->y *= r;
v->z *= r;
}

*rv = float3(rv->x + (launchsrc->param1.x) * 0.5f,
rv->y + (launchsrc->param1.y) * 0.5f,
rv->z + (launchsrc->param1.z) * 0.5f);
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