How to determine actor facing in top-down Paper2D?

I’m making a top-down Zelda-esque game using Paper2D. My Y axis is being used for depth, and z axis is being used for vertical movement. I’ve been able to use GetForwardVector to determine whether or not the actor is moving to the left or right, but I haven’t been able to find a way to separate Up/Down movement in a usable way.

This is how I’ve been able to store the X axis and change it into left/right.

Thank you to Squize for the answer here, using Velocity was the answer. Take velocity, then weight the movement using the absolute value of the X/Z axis.