A physics component that carries the motion fields of a
complex emitter: birth and over-life velocity,
acceleration, drag, rotation and scale, the spawn shape, the emission mesh, force fields,
terrain following and the emitter-frame overrides. It has its own running part, which
moves the particles of a component emitter
with these fields.
The client creates it only when a bin declares one. It never converts a complex
emitter's motion fields into this component.
A field with the same name as a field of
VfxEmitterDefinitionData has the meaning that page
gives it. This page documents only what differs.