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Function: integer llDetectedLinkNumber( integer number );

Returns the link_number (an integer) of the triggered event. If not supported by the event, returns zero.

• integer number Index of detection information

number does not support negative indexes. For touch and collision categories of events only.


llDetected* functions only work if called from within Detection events (collision, collision_start, collision_end, sensor, touch, touch_start, touch_end) or in functions called by Detection events. They will fail silently and return unusable values if called during other events.


  • llDetectedLinkNumber will return 0 in collision_start and collision_end events of VolumeDetect objects (SVC-2996).
  • If number is out of bounds this function returns 0 and the script continues to execute without an error message.
  • Events that enable the llDetected* functions always return at least one detected item.
    • Detection events are not raised if there is nothing detected.[1]
    • The detection event's items detected parameter is initially never less than 1.[2]
All Issues ~ Search JIRA for related Bugs


// Drop this script into the root prim of of a build
// Touch any prim to learn its link number
    touch_start(integer num_detected)
        llOwnerSay("Link number clicked: " + (string)llDetectedLinkNumber(0) );       

See Also


•  touch_start
•  touch
•  touch_end
•  collision_start
•  collision
•  collision_end


•  llDetectedTouchFace


•  Detected

Deep Notes

All Issues

~ Search JIRA for related Issues
   llDetectedLinkNumber returns 0 with llVolumeDetect(TRUE)


  1. ^ The exception is no_sensor but it doesn't enable llDetected* functions.
  2. ^ Like all event parameters, the user can overwrite the initial value.


function integer llDetectedLinkNumber( integer number );