> For the complete documentation index, see [llms.txt](https://docs.miltechsimulations.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.miltechsimulations.com/miltech-mission-hub/detailed-documentation/map-objects/circle-trigger.md). # Circle Trigger A trigger based on a circular area in the world. You can set it to trigger when the player enters, is inside, or exits the area. ### Attributes

Attribute	Description
Active On Start	Enabled: the trigger will start evaluating the trigger conditions as soon as the missions starts Disabled: you need to activate this trigger during the mission
Fire Once	Enabled: the trigger will deactivate (stop evaluating) when it fires a connection for the first time Disabled: the trigger will keep firing the connected events until it is deactivated
Radius	Radius of the circle in meters

### Actions

Action	Description
Activate	The trigger start evaluating the trigger conditions
Deactivate	The trigger will stop evaluating the trigger conditions

### Events The events are only fired when the trigger is active

Event	Description
On Enter	Fires when the player goes from outside to inside the area
While Inside	Fires when the player is inside the area (also if the player is already inside when the trigger is activated)
On Exit	Fires when the player goes from inside to outside the area

## See also [Rectangle Trigger](/miltech-mission-hub/detailed-documentation/map-objects/rectangle-trigger.md) --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.miltechsimulations.com/miltech-mission-hub/detailed-documentation/map-objects/circle-trigger.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. 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.