Function 
-  Various definitions pertaining to vectors

Macros 
-  rsqrtf(x)
  Returns the inverse of sqrtf(x). 

-  mrsqrtf(k,x)
  Returns the inverse of sqrtf(x) multiplied by k. 

-  rsqrtf2(x)
  Returns the inverse of sqrtf(x).  However, returns 0.0f when x < EPSILON. 

-  mrsqrtf2(k,x)
  Returns the inverse of sqrtf(x) multiplied by k.  However, returns 0.0f when x < EPSILON. 

-  pow2(x)
  Returns the square of x. 

Functions 
-  int mvmGetAngle( const MvmVector3f v1, const MvmVector3f v2 )
  Returns the angle between v1 and v2.  (Returns 32768 when the angle is 180 degrees.)

History
  1998/11/16 Takamitsu Hirata 
    util.h, util.c :  Initial version 
