Transform/multiply the given 2D-vector <code>(x, y)</code>, as if it was a 3D-vector with z=0, by
this matrix and store the result in <code>dest</code>.
<p>
The given 2D-vector is treated as a 3D-vector with its z-component being <code>0.0</code>, so it
will represent a direction in 2D-space rather than a position. This method will therefore
not take the translation part of the matrix into account.
<p>
In order to store the result in the same vector, use {@link #transformDirection(Vector2d)}.
@see #transformDirection(Vector2d)
@param x
the x component of the vector to transform
@param y
the y component of the vector to transform
@param dest
will hold the result
@return dest
Transform/multiply the given 2D-vector <code>(x, y)</code>, as if it was a 3D-vector with z=0, by this matrix and store the result in <code>dest</code>. <p> The given 2D-vector is treated as a 3D-vector with its z-component being <code>0.0</code>, so it will represent a direction in 2D-space rather than a position. This method will therefore not take the translation part of the matrix into account. <p> In order to store the result in the same vector, use {@link #transformDirection(Vector2d)}.
@see #transformDirection(Vector2d)
@param x the x component of the vector to transform @param y the y component of the vector to transform @param dest will hold the result @return dest