|OpenGL has a concept of
start time and end time (or head time) specifying range of displayed objects.
|(All these attributes could
be generalised to all types of viewers.)
|“fade” diminishes the
brightness of earlier times.
Lines have a vapour-trail effect.
|It can display the head time
|It can display the “light
front”, I.e., the wavefront of light starting at time zero at position given.
|Pans at speed of light since
v = dx/dt = 0.3 mm / 0.001 ns