'syncNow' is a synchronized 'now' time. The
first time 'syncNow' is used, the current time will be stored and used
for all subsequent calls to 'syncNow'. 'syncNow' is reset every
time a new animation frame is drawn, or 100ms after a first syncNow call
has been made after a reset.
'now' is the instantaneous time
'nextFrame' will be the time of the next animation frame
'prevFrame' is the time of the last animation frame
'nextFrame'|'prevFrame'|'syncNow'|'now''syncNow'is a synchronized 'now' time. The first time 'syncNow' is used, the current time will be stored and used for all subsequent calls to 'syncNow'. 'syncNow' is reset every time a new animation frame is drawn, or 100ms after a first syncNow call has been made after a reset.'now' is the instantaneous time
'nextFrame'will be the time of the next animation frame'prevFrame'is the time of the last animation frame