ReadonlycapacityReadonlycolorsReadonlyemitterReadonlyframePer-frame [xMin, yMin, zMin, xMax, yMax, zMax], or zeros for an empty frame.
ReadonlyframePer-frame record boundaries; frame N occupies [offsets[N], offsets[N + 1]).
ReadonlygenerationsReadonlymeshReadonlynameReadonlypositionsReadonlypreviousReadonlyrotationsReadonlysimulationReadonlysizesReadonlystableReadonlystorageReadonlyvelocities
One emitter's frame-major particle instance streams.