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#ifndef __VECTORLIB_H_INCLUDED__ 
#define __VECTORLIB_H_INCLUDED__ 
 
#include  
 
 
/*************************** Macros and constants ***************************/ 
// returns a number ranging from -1.0 to 1.0 
#define FRAND   (((float)rand()-(float)rand())/RAND_MAX) 
#define Clamp(x, min, max)  x = (x