1 #include <extUtil.h> 2 3 /* angle between two vectors in rad */ v_angle(double * v0,double * v1)4double v_angle( double *v0, double *v1 ) 5 { 6 double vn0[3], vn1[3]; 7 double fi; 8 9 v_norm( v0, vn0 ); 10 v_norm( v1, vn1 ); 11 /* winkel zwischen den Vektoren */ 12 fi=v_sprod( vn0, vn1 ); 13 return(acos(fi)); 14 } 15