llDetectedGrab

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/LSL

DetectedGrab

llDetectedGrab

Summary

Function: vector llDetectedGrab( integer number );

37	Function ID
0.0	Forced Delay
10.0	Energy

Returns a vector that is the grab offset of the user touching the object; only works in the touch event.

• integer

number

–

Index of detection information

number does not support negative indexes. Returns <0.0, 0.0, 0.0> if number is out of range or if called from an event other than the touch event.

Specification

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 the object is physical, grabs are detected if the avatar has permission to move the object and the object is not locked.
• If the object is nonphysical, grabs from all avatars are detected.

Caveats

• If number is out of bounds this function returns <0.0, 0.0, 0.0> 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

Examples

<lsl> default {

   state_entry()
   {
       llSetStatus(PRIM_PHYSICS,TRUE);//This allows the object to be "grabbed" and dragged
   }
   touch(integer num_detected)
   {
       llSay(0,(string)llDetectedGrab(0));//Be prepared for a great amount of chatted info.
                                          //The faster you move the mouse while grabbing the object the greater the offset becomes.
                                          //This is not due to the speed but the reaction time of the turn around of the physical prim,
                                          //thus an offset (distance from grab to prim center) is created and measured by this function.
   }

} </lsl>

<lsl>/******

Simple llDetectedGrab illustration, rez a prim and add this script. The prim will become a cone that follows mouse grabs.

Click and hold the mouse button down on the object, then:
- Drag left and right to move parallel to the camera focal plane.
- Drag up and down to move to and from from the camera.
- Hold down Ctrl, then drag up and down to move vertically.

• • • • • • /

default {

   state_entry()
   {
       llMinEventDelay(0.25);
       llSetStatus(STATUS_PHYSICS, FALSE); // make the object static for simplicity
       llSetPrimitiveParams([
           PRIM_SIZE, <0.5, 0.5, 0.5>,
           PRIM_TYPE, PRIM_TYPE_CYLINDER, PRIM_HOLE_DEFAULT, <0.0, 1.0, 0.0>,
             0.0, ZERO_VECTOR, ZERO_VECTOR, ZERO_VECTOR
       ]); // a cone that can follow the mouse pointer
   }
   
   touch(integer total_number)
   {
       llLookAt(llGetPos() + llDetectedGrab(0), 1.0, 1.0);
   }

}</lsl>

Notes

llDetectedGrab() is not blocked by STATUS_BLOCK_GRAB or STATUS_BLOCK_GRAB_OBJECT.

See Also

Events

•	touch_start
•	touch
•	touch_end

Functions

•

llPassTouches

Articles

•	Detected
•	Grab

Deep Notes

Search JIRA for related Issues

Footnotes

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.

Signature
function vector llDetectedGrab( integer number );