format  Fixed32 result = MTH_Sqrt (Fixed32x)
 Input  x: Positive fixed-point real value
 Output  None
 Function value  result: Calculated value of square root
 Function  Calculates and returns the square root of the input value. 

  format  Fixed32 z = MTH_Hypot (Fixed32 x, Fixed32 y)
 Input  x: Horizontal side of right triangle
 y  y: vertical side of right triangle
 Output  None
 Function value  z: Length of hypotenuse of right triangle
 Function  Returns z that satisfies the following expression.
 z  z squared = x squared + y squared and z ≧ 0 

  format  voidMTH_ComputeNormVect (Fixed32 surfNormK,
(:  MthXyz * p0, MthXyz * p1, MthXyz * p3, MthXyz * normal)
 Input  surfNormK: Vertex distance correction value
:  p0: Coordinate of the first clockwise vertex on the surface
:  p1: Coordinates of the clockwise second vertex on the surface
:  p2: The coordinates of the third vertex on the right-hand side on the surface
 Output  normal: Normal vector of the surface (unit vector)
 Function value  None
 Function  Calculates the normal to the specified clockwise vertex face. For normal vector surfaces
The direction of   is the reverse direction of the right-hand thread.
  The normal vector is calculated using two vectors based on the difference between two vertices of the three vertices of the surface.
 Get  and obtain it by the outer product.
  The correction value for the specified distance between vertices is converted to an absolute value to obtain two vectors for obtaining the outer product.
 Can be multiplied by  This is too small or too large between the three vertices of the face
If .  is used, 32-bit fixed-point operations will use underflow or off for cross product calculations.
 -It may not be possible to calculate correctly due to an overflow.
:  In order to avoid this, the vector is calculated at the stage of obtaining the vector based on the difference between the three vertices of the surface.
Set the correction value for the distance between vertices so that the absolute value of   is as close to 1.0 as possible.
. 
:  If the sign of the correction value for the distance between vertices is negative, the normal vector is reversed.
.