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Function: vector llDetectedTouchBinormal( integer index );

Returns a vector that is the surface binormal (tangent to the surface) where the touch event was triggered.

• integer index Index of detection information

index does not support negative indexes. For the touch category 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.


  • If index is out of bounds 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]TOUCH_INVALID_VECTOR is returned when...
  • The avatar's viewer does not support face touch detection.
  • The touch has moved off the surface of the prim.
  • The triggering event is not a touch event.
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See Also


•  touch_start
•  touch
•  touch_end


•  llDetectedLinkNumber
•  llDetectedTouchFace
•  llDetectedTouchST
•  llDetectedTouchUV
•  llDetectedTouchPos
•  llDetectedTouchNormal


•  Detected

Deep Notes


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  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 vector llDetectedTouchBinormal( integer index );