2009

You can't. As you drag over the different actions in Event 01, a red line
appears at the top of the event, showing that the Birth operator will be
placed here, no matter where you release the mouse button.
4 Try to drag a new Birth operator from the depot to Event 01.
As in the previous step, the only place you can drop the Birth operator
is at the top of the event, replacing the existing Birth operator.
5 From the depot, drag the Birth operator to an empty area in the event
display.
Particle Flow creates a new birth event, Event 02, containing the Birth
operator and a Display operator.
6 Wire the output of the global event, PF Source 01, to the event input of
Event 02.
Each birth event must be associated with a global event to be able to
generate particles.
7 From the depot, add a Send Out test at the end of both Event 01 and
Event 02.
8 Try to wire the test output of Event 02 to the event input of Event 01.
Particle Flow doesn't let you, because this would result in two Birth
operators in series.
9 Try to wire the test output of Event 01 to the event input of Event 02.
Again, Particle Flow doesn't let you, because this would result in two Birth
operators in series.
10 Drag a Speed operator to an empty area of the event display.
Particle Flow creates a new event, Event 03.
11 Wire the test output of Event 01 to the event input of Event 03.
12 Wire the test output of Event 02 to the event input of Event 03.
There's no problem wiring the two birth events to a single, third event.
The birth events exist in the particle stream in parallel, each generating
particles independently and then feeding its particle stream into a
common event, where the two streams are combined.
If the second birth event had its own global event, you could, at any
point further downstream, separate the streams back out according to
their origin using the Split Source test on page 3001. To do this, delete the
wire from PF Source 01 to Event 02, add an
Empty Flow on page 2954 to
the system, and then wire it to Event 02.
Particle Flow | 2845