Particle Replay Track
The Particle Replay track allows you to create and play back pre-recorded particle simulations. This is especially useful when you want the particle to behave the same
way in all shots. When you add a new key to the Particle Replay Track, you are essentially adding a new clip to record to. For each clip, a bar is displayed on the timeline
showing the duration of the clip.
When selected, you have the ability to adjust the starting point and duration of the clip using the handles on either end of the clip's bar in the timeline. Left-clicking
and dragging the mouse on either handle will adjust the duration of the clip by moving that handle. To move the clip without adjusting its duration, Ctrl+Click and drag on
the key itself.
You can also adjust the starting position and duration of the clip as well as change the ID of the clip by Right-clicking on the clip's bar in the timeline and choosing
the appropriate option from the menu.
To begin recording the particle system(s), Right-click on the track and choose Start Recording Particles from the context menu.
When recording is active, the clip bars will be highlighted in the timeline.
Press the Play button in the toolbar to begin playback. The track will record the particles during play back when recording is enabled.
Once recording is finished, Right-click the track again and choose Stop Recording Particles.
Now, when you press the Play button, the particle system(s) should play back from the recorded clips and you can scrub through the timeline to
move forward and backward through the clips to inspect the recording.