double rand_norm(void) { return mtRand->randExc(); }
float frand(float min, float max) { return mtRand->randExc(max - min) + min; }
double rand_chance(void) { return mtRand->randExc(100.0); }
float rand_chance_f(void) { return (float)mtRand->randExc(100.0); }
float rand_norm_f(void) { return (float)mtRand->randExc (); }