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This commit is contained in:
Gabriele Cosmo
2017-12-08 12:52:30 +01:00
parent 98e455a940
commit fc6af9e721
2166 changed files with 276760 additions and 100873 deletions
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source/global/HEPRandom/include/G4RandomTools.hh
+84 -2
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@@ -24,7 +24,7 @@
// ********************************************************************
//
//
// $Id: G4RandomTools.hh 90092 2015-05-13 11:53:25Z gcosmo $
// $Id: G4RandomTools.hh 105368 2017-07-24 09:44:20Z gcosmo $
//
//
// ---------------------------------------------------------------------------
@@ -36,6 +36,8 @@
// History:
//
// 24.08.17 - E.Tcherniaev, added G4RandomRadiusInRing, G4RandomPointInEllipse
// G4RandomPointOnEllipse, G4RandomPointOnEllipsoid
// 07.11.08 - P.Gumplinger, based on implementation in G4OpBoundaryProcess
//
// ---------------------------------------------------------------------------
@@ -47,10 +49,12 @@
#include "globals.hh"
#include "Randomize.hh"
#include "G4TwoVector.hh"
#include "G4ThreeVector.hh"
#include "G4RandomDirection.hh"
// ---------------------------------------------------------------------------
// Returns a random lambertian unit vector
// Returns a random lambertian unit vector (rejection sampling)
//
inline G4ThreeVector G4LambertianRand(const G4ThreeVector& normal)
{
@@ -91,4 +95,82 @@ inline G4ThreeVector G4PlaneVectorRand(const G4ThreeVector& normal)
return cosphi * vec1 + sinphi * vec2;
}
// ---------------------------------------------------------------------------
// Returns a random radius in annular ring
//
inline G4double G4RandomRadiusInRing(G4double rmin, G4double rmax)
{
if (rmin == rmax)
{
return rmin;
}
G4double k = G4UniformRand();
return (rmin <= 0) ? rmax*std::sqrt(k)
: std::sqrt(k*rmax*rmax + (1.-k)*rmin*rmin);
}
// ---------------------------------------------------------------------------
// Returns a random point in ellipse (x/a)^2 + (y/b)^2 = 1
// (rejection sampling)
//
inline G4TwoVector G4RandomPointInEllipse(G4double a, G4double b)
{
G4double aa = (a*a == 0) ? 0 : 1/(a*a);
G4double bb = (b*b == 0) ? 0 : 1/(b*b);
for (G4int i=0; i<1000; ++i)
{
G4double x = a*(2*G4UniformRand() - 1);
G4double y = b*(2*G4UniformRand() - 1);
if (x*x*aa + y*y*bb <= 1) return G4TwoVector(x,y);
}
return G4TwoVector(0,0);
}
// ---------------------------------------------------------------------------
// Returns a random point on ellipse (x/a)^2 + (y/b)^2 = 1
// (rejection sampling)
//
inline G4TwoVector G4RandomPointOnEllipse(G4double a, G4double b)
{
G4double A = std::abs(a);
G4double B = std::abs(b);
G4double mu_max = std::max(A,B);
G4double x,y;
for (G4int i=0; i<1000; ++i)
{
G4double phi = CLHEP::twopi*G4UniformRand();
x = std::cos(phi);
y = std::sin(phi);
G4double mu = std::sqrt((B*x)*(B*x) + (A*y)*(A*y));
if (mu_max*G4UniformRand() <= mu) break;
}
return G4TwoVector(A*x,B*y);
}
// ---------------------------------------------------------------------------
// Returns a random point on ellipsoid (x/a)^2 + (y/b)^2 + (z/c)^2 = 1
// (rejection sampling)
//
inline
G4ThreeVector G4RandomPointOnEllipsoid(G4double a, G4double b, G4double c)
{
G4double A = std::abs(a);
G4double B = std::abs(b);
G4double C = std::abs(c);
G4double mu_max = std::max(std::max(A*B,A*C),B*C);
G4ThreeVector p;
for (G4int i=0; i<1000; ++i)
{
p = G4RandomDirection();
G4double xbc = p.x()*B*C;
G4double yac = p.y()*A*C;
G4double zab = p.z()*A*B;
G4double mu = std::sqrt(xbc*xbc + yac*yac + zab*zab);
if (mu_max*G4UniformRand() <= mu) break;
}
return G4ThreeVector(A*p.x(),B*p.y(),C*p.z());
}
#endif /* G4RANDOMTOOLS_HH */