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/* vdot( V1, V2) // Dot product of V1 and V2. ('scalar product').
      It's directly proportional to the length of the vectors V1 and V2
      and the cosine of the angle between V1 and V2. 
      A*B = |A||B| cos(A,B).  If vdot(A,B) = 0, then VAngleD(A,B) = 90 degrees. 
      Formula: vdot=V1.x*V2.x + V1.y*V2.y + V1.z*V2.z.
*/
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#declare Project_A_to_B = B*vdot(A,B)/vdot(B,B);
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