This variable can be used to get (or to set) the angle of the
instances fixture in degrees, similar to setting or getting the
However note that in the physics world rotations are calculated in
the opposite way to the normal GameMaker Studio 2 game
world, meaning that vector functions like point_direction
should have their return values modified (simply making positive to
negative should resolve this).
if phy_speed_x > 0 || phy_speed_y > 0
phy_rotation += sqrt(sqr(phy_speed_x) + sqr(phy_speed_y)) /10;
The above code checks the linear speed and if either vector is not 0, it then calculates the actual speed and uses that to set the rotation.