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#ifndef ND_RANDOM_H
#define ND_RANDOM_H
#include <gsl/gsl_integration.h>
#include <gsl/gsl_rng.h>
#include <gsl/gsl_vector.h>
void random_direction_vector (const gsl_rng* r, gsl_vector* x);
void cone_random_vector (const gsl_rng* r, const gsl_vector* mean, double theta_max, gsl_vector* x);
void hollow_cone_random_vector (const gsl_rng* r, const gsl_vector* mean, double theta_min, double theta_max, gsl_vector* x);
double planar_angle_to_solid_angle (double planar_angle, unsigned int dimension);
double solid_angle_to_planar_angle (double solid_angle, unsigned int dimension);
#endif
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