Forgive me if this isn't well phrased, it's been a while since I've done any maths!
I have a 2d image whose central point is located at the world origin, and it is in the plane $z = 0$.
If I rotate the image $\alpha$ degrees about the $z$-axis and $\beta$ degrees about the $x$-axis, how can I calculate the normal vector to the plane the image is now on?
Thanks in advance.