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hslt: vmf.cpp numerical robustness

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johannes hanika 2014-11-03 16:23:48 +01:00 committed by Wenzel Jakob
parent 9f5410b4c1
commit 4a0d0aa694
1 changed files with 1 additions and 1 deletions
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2
src/libcore/vmf.cpp
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@ -31,7 +31,7 @@ Float VonMisesFisherDistr::eval(Float cosTheta) const {
* m_kappa / (4 * M_PI * std::sinh(m_kappa)); * m_kappa / (4 * M_PI * std::sinh(m_kappa));
#else #else
/* Numerically stable version */ /* Numerically stable version */
return math::fastexp(m_kappa * (cosTheta - 1)) return math::fastexp(m_kappa * std::min((Float)0, cosTheta - 1))
* m_kappa / (2 * M_PI * (1-math::fastexp(-2*m_kappa))); * m_kappa / (2 * M_PI * (1-math::fastexp(-2*m_kappa)));
#endif #endif
} }