Transform/multiply the given vector by this matrix by assuming a third row in this matrix of <code>(0, 0, 1)</code>
and store the result in that vector.
@see Vector3d#mul(Matrix3x2d)
@param v
the vector to transform and to hold the final result
@return v
Transform/multiply the given vector by this matrix by assuming a third row in this matrix of <code>(0, 0, 1)</code> and store the result in that vector.
@see Vector3d#mul(Matrix3x2d)
@param v the vector to transform and to hold the final result @return v