SimTimeControls.unitypackage contains a prefab of a UI Panel for representing and controlling time. The time control functionality is primarily intended to aid in the visualization of biophysical processes (e.g. a hydrology model of a watershed). Such biophysical models are discrete time models with "simulation steps" at equal intervals throughout the duration of the model. A TimeSlider component is attached to a Unity 4.6+ UI Slider gameobject. The TimeSlider component provides a public interface for controlling whether or not the slider is playing (running through time) and for setting the playback speed relative to wall time. The TimeSlider component also exposes public properties conveying the current simulation step and simulation time.