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VfxSpawnBehavior

15.23 Interface

Inheritance 3 descendants

Class Documentation

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The spawn source of a VfxLifetimeComponent, stored in its SpawnBehavior slot. A spawn behaviour supplies an emission rate in particles per second, a burst count, or both. The lifetime component turns them into the number of particles to spawn in each simulation step.

Spawn count

In each step in which the emitter may spawn, the lifetime component computes the count in this order:

  1. Time window. During the emitting phase of the state machine, the time since the last spawn. On the step that ends the emitting phase, the part of that step that was still inside the phase. In every other phase the count is 0.
  2. Rate. The behaviour's rate, evaluated in every step. If the rate is 0 and the behaviour has no burst, the count is 0.
  3. Quality. The rate is multiplied by the emission-rate factor of the current effects quality setting.
  4. Count. The rate times the window, truncated to a whole number. One step spawns at most the rate times 0.33, truncated, plus 1. After a long step the emitter therefore makes up at most 0.33 seconds of emission.
  5. Start of the phase. While no particle has spawned in the current emitting phase, a behaviour with a burst replaces the count with its burst count. The burst count is not multiplied by the quality factor. A behaviour without a burst adds 1 particle instead.
  6. Capacity. The primitive of the geometry component can lower the count to the number of particles that it can still hold.

Each emitting phase starts again at step 5, so a behaviour with a burst bursts at the start of every emitting phase.

Burst test. Whether a behaviour has a burst is decided once per definition, when the first emitter instance is created, by evaluating its burst count. If the count is 0 at that moment, no instance of that definition ever bursts.

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