Exercise 2: A MOVING BIRTH POSITION
Note: current Jaleo API limitations precludes the ability to predict
the velocity and direction of particles, based on the movement of the
birth position alone. Hopefully this feature will become available in
the near future. Until then PLEASE SKIP THIS SECTION!
- load Particles
- use an empty clip for the background; only one input clip is needed
for this experiment
- extend the length of the clip to 100+/- frames
- set up the shuttle to cover the fx
- open a monitor
- go to frame 0
- open the time editor
- set the X/Y co-ordinates for the intial birth position
- go to the last frame and set another location for the birth position
- set up a couple intermediate key frames to give a little more interest to the move.
- set Gravity to 0.0.
- Set Velocity Scale to 200.0.
- pop up the PI
- click on KILL ALL PARTICLES
- select streaks so you can see more easily the movement
- play through the sequence
The particles are thrown out in the direction of the movement. Their velocity is derived from the distance moved
between frames.
- Set Velocity Scale to -200.0.
- click on KILL ALL PARTICLES
- play through the sequence.
The particles are thrown out from the
direction of
the movement.
INFLUENCES IN EXERCISE 2
All the factors described for exercise 1 apply here with the addition
of natural velocity.
VELOCITY:
- The distance moved by the birth position between frames will give each particle an
initial velocity. This can be scaled with Velocity Scale, a variance
added to the speed of each particle with Velocity Magnification Variance
and a directional variance with Velocity Direction Variance.
- The velocity direction comes from the movement of the birth position.
Changing the Velocity Direction will have little to no effect.
- There will be a further control available in the fullness of time
in order to choose how the velocity is calculated.
Index