FloatProperty
U8 = 0 Selects the channel. 0 selects none and always returns 0. 1, 2 and 3 select
three particle channels. What each channel holds is not yet identified. Values above
3 are not established.
A float driver that reads a per-particle float channel of the emitter. Components of the emitter write the channels.
The driver returns 0 when it is evaluated for the emitter rather than for a particle,
when the particle index is not a live particle, or when the emitter has no such channel.
U8 = 0 Selects the channel. 0 selects none and always returns 0. 1, 2 and 3 select
three particle channels. What each channel holds is not yet identified. Values above
3 are not established.