From VFXPedia

pSpawn [pSp]

The pSpawn tool makes each affected particle act as an emitter that can produce one or more particles of its own. The original particle continues until the end of its own lifespan, and each of the particles it emits becomes wholly independent with a lifespan and properties of its own. As long as a particle falls under the effect of the pSpawn tool, it will continue to generate particles. It is important to restrict the effect of the tool with limiters like Start And End Age, Probability, Sets and Regions, and by animating the parameters of the emitter so that the tool is operative only when required.

Controls Tab

The pSpawn tool has a large number of controls, most of which exactly duplicate those found within the pEmitter tool. There are a few controls that are unique to the pSpawn tool, and their effects are described below.

Selecting this checkbox causes particles created by spawning to also become affected by the Spawn tool on subsequent frames. This can exponentially increase the number of particles in the system, driving render times up to an unreasonable degree. Use this checkbox cautiously.

This control determines how much velocity of the source particle is transferred to the particles it spawns. The default value of 1.0 causes each new particle to adopt 100 percent of the velocity and direction from its source particle. Lower values will transfer less of the original motion to the new particle.

Tips for pSpawn (edit)

EyeonTips:Manual/Tool Reference/Particles/pSpawn

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