VfxDynamicParametersData

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An event-driven override table for a running particle system, attached to VfxSystemDefinitionData through its DynamicParameterData property. It lets a system change individual emitter parameters part-way through its life instead of fixing them at spawn.

The table is keyed in three levels: one entry per event, inside it a map from emitter to the parameters that emitter changes, and inside that a map from parameter selector to the override supplying the new value. When an event fires, every override beneath it is installed on the live system, and each stays in force until something replaces it.

Emitters are addressed by the FNV-1a-32 hash of their emitterName, not by position in the system's emitter lists, so reordering the lists does not break an entry but renaming an emitter does.

The parameter selector is a small integer:

Value	Parameter overridden
1	Particle scale, and the linger scale while a particle is lingering. Also applied at emitter level, ahead of the emitter's flex scale.
2	UvScale of the emitter's main texture.
3	UvScale of the emitter's TextureMult layer.
4	Emission rate, in particles per second.
5	Particle lifetime.
6	Birth velocity.

An override stores no finished value. It carries a chain of modifiers applied in order to a four-component vector, and the folded result is what gets installed.

Notes

• Selectors 0 and 7 are also accepted, but the parameters they select have not been identified.
• Events are stored as bare hashes, and what fires one has not been identified.

Properties

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The table's per-event entries, one per event the system reacts to.

Referenced by 1 class · 1 property

• VfxSystemDefinitionData DynamicParameterData Pointer<VfxDynamicParametersData>

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