# Particles

## History of particles in CGP

points controlled by attributes eg. forces, velocity

* Uses: fire

#### Pop Source

* Source
  * points - uses some of the pointss
* Birth 
  * Impulsive Activation: immediate. burst on first frame: `$F==1`
  * Constant Activation - Emit over seconds
* Attributes
  * Velocity default - add to inherited velocity cuz of variance 

#### Pop collision detect

* Specify SOP object and response - die on contact

#### Using popwrangle

```
```

* Importing information from popnet
  * Under Object Merge, Object: popobject info instead of using a dopimport