This is an example that shows how to control particle systems from a custom track class.
The standard Control Track provides basic functionalities to control a particle system within a timeline track. Although it's enough for most cases, it has some small limitations.
- It only provides on/off switch. An extra Animation Track is needed to control particle parameters.
- The Inherit Velocity module doesn't work with the Control Track.
- It overrides the random seed number with the same value even if there are multiple particle systems under the hierarchy.
- It uses the fixed delta time as a simulation interval. This is not ideal to get smooth animation.
The custom track class (ParticleSystemControlTrack) contained in this example
provides the following functionalities.
- Playhead scrubbing support (not perfect; reset on rewinding).
- Emission rate control. It's controllable from both inline animation curves and ease-in/out curves.
- Inherit Velocity module support.
- Transform snapping support.
- Random number override just happens with a single particle system.
- Animation with system delta time.
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