# 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 --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.nosleepcreative.com/dev/archive/vex/particles.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.