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Function: llSensor( string name, key id, integer type, float range, float arc );

Performs a single scan for name and id with type within range meters and arc radians of forward vector

• string name object or avatar name
• key id
• integer type mask (AGENT, ACTIVE, PASSIVE, and/or SCRIPTED)
• float range range 0.0 to 96.0m
• float arc the max angle between the local x-axis of the prim and detectable objects, range 0.0 to PI

If name or id is empty then that empty constraint is ignored.
If id is an invalid key or NULL_KEY it is treated as empty.


  • When searching for an avatar but not by name, it doesn't matter which AGENT flag is used.
  • Attachments cannot not detect their wearer (this includes HUD attachments).
  • If type is zero, the sensor will silently fail, neither sensor or no_sensor will be triggered.
  • Only 16 objects will be scanned each time.
All Issues ~ Search JIRA for related Bugs


This sensor scans a 45 degree cone about the x-axis. (PI/2 or PI_BY_TWO scans a hemisphere. PI is a spherical scan.) <lsl>llSensor( "Gigs Taggart", NULL_KEY, AGENT, 96.0, PI/4 );</lsl>

This sensor detects all prims and agents with a given name within 15m of the sensor. (AGENT, PASSIVE and ACTIVE behave inclusively. SCRIPTED is not inclusive and will exclude non-scripted targets (like avatars) from the detected set.)

<lsl>llSensor( "", NULL_KEY, ( AGENT

See Also


•  sensor Triggered when a sensor detects something
•  no_sensor Triggered when a sensor detects nothing


•  llSensorRepeat Runs a sensor on a timer
•  llSensorRemove Stops the llSensorRepeat timer


•  Object Type

Deep Notes

Search JIRA for related Issues


function void llSensor( string name, key id, integer type, float range, float arc );