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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