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fix parametrization of UniformInShell function #379

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fix parametrization of UniformInShell function #379

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fb4312c
fixed parametrization of UniformInShell function
heberlr Jul 24, 2025
6fe2f7b
UniformInShell function simplified using UniformOnUnitSphere
heberlr Jul 24, 2025
502f816
Update max_cell_interactive_distance_in_voxel during position update
heberlr Feb 16, 2026
337722c
Revert "Update max_cell_interactive_distance_in_voxel during position…
heberlr Feb 16, 2026
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14 changes: 7 additions & 7 deletions core/PhysiCell_rules.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2331,13 +2331,13 @@ std::vector<double> UniformInShell( double r1, double r2 )
sqrt_one_minus_T -= T;
sqrt_one_minus_T = sqrt( sqrt_one_minus_T );

double param1 = pow( UniformRandom() , 0.33333333333333333333333333333333333333 ); // xi^(1/3),
// param1 *= (r2-r1);
// param1 += r1;
double param2 = param1; // xi^(1/3)
param2 *= 2.0; // 2 * xi^(1/3)
param2 *= sqrt_T; // 2 * xi(1) * T^(1/2)
param2 *= sqrt_one_minus_T; // 2 * xi(1) * T^(1/2) * (1-T)^(1/2)
double r1_3 = r1*r1*r1;
double r2_3 = r2*r2*r2;
double param1 = pow( r1_3 + (r2_3-r1_3) * UniformRandom() , 0.33333333333333333333333333333333333333 ); // r scaled by xi^(1/3)
double param2 = param1; // r * xi^(1/3)
param2 *= 2.0; // 2 * r * xi^(1/3)
param2 *= sqrt_T; // 2 * r * xi(1) * T^(1/2)
param2 *= sqrt_one_minus_T; // 2 * r * xi(1) * T^(1/2) * (1-T)^(1/2)

double theta = UniformRandom(); // U(0,1)
theta *= two_pi; // U(0,2*pi)
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