The main update method for this Particle.
Updates its life values, computes the velocity and repositions the Particle.
| name | type | description |
|---|---|---|
| delta | number |
The delta time in ms. |
| step | number |
The delta value divided by 1000. |
| processors | array |
An optional array of update processors. |
Returns true if this Particle has now expired and should be removed, otherwise false if still active.