Use dot when you need to obtain the dot product of two vectors.
The dot product of two vectors, v1 and v2 is defined to be v1.x*v2.x + v1.y*v2.y + v1.z*v2.z. The dot product is also equal to the length of v1 times the length of v2 times the cosine of the angle between them.
While the dot function is available, the Shogun Post function
getAngleTo should be used when computing angles between vectors.
Returns the dot product of v1 and v2.
vector $v1 = <<1, 0, 0>>;
vector $v2 = <<0, 1, 0>>;
// show that the dot product between two orthogonal vectors is = 0
print( string( dot($v1, $v2) ) );
// show that the formula below is equivalent (for these particular $v1
// and $v2 choices) to a call to getAngleTo
print( acos( dot($v1, $v2) / (getLength($v1)*getLength($v2)) ) );
print(getAngleTo($v1, $v2)) ;