phy_rotation

This variable can be used to get (or to set) the angle of the instances fixture in degrees, similar to setting or getting the image_angle. However note that in the physics world rotations are calculated in the opposite way to the normal GameMaker game world, meaning that vector functions like point_direction()should have their return values modified (simply making positive to negative should resolve this).

Syntax:

phy_rotation;

Returns:

Real (single precision floating point value, or undefined if the instance is not physics enabled)

Example:

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.