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Animation Times
The position of a particle at a given time t is found by linear interpolation along the line connecting the two events whose times bracket t. In the time animation, t is continuously incremented or decremented by the time step dt and the particles are displayed at the new time. Each frame is displayed for user specified interval, typically a fraction of a second. The animation may run more slowly than the requested interval if a large number of tracks and/or graphics elements shown require more time to process and display.
The user can give an explicit value for dt or specify the number of time steps N, in which case
dt = (T0 - TN) / Nwhere T0 and TN are the time limits of the animation. These limits can be set to the extremes of the times in the track data or set by the user. A user value for TN is advantageous in models where a few particles are present for a long time while not doing much, such as some low energy neutrons rattling around before termination. The animation may be a single sequence between T0 and TN (or in reverse from TN to T0), or it can loop continuously. When looping, the movement can always be in the same direction in time, or the direction can change at each limit-changing from forward to reverse when TN is reached and from reverse to forward at T0.
 White Rock Science http://www.whiterockscience.com/wrs.html 505 672 1105 |
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