Programming Units

2D coordinates are in screen coordinates, visible screen coordinates are in this range : (-D.w, -D.h) .. (D.w, D.h), D.w and D.h are engine methods which allow you to dynamically access screen sizes
3D coordinates are in meter units
Angles are in radian units
Time values are in second units (except integers which are in milliseconds, 1 second = 1000 milliseconds)
Velocities are in meters per second units
Angular Velocities are in radians per second units