Difference between revisions of "LlMoveToTarget"

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{{LSL Function/damping|tau}}{{LSL_Function
{{LSL_Function
|inject-2=
{{Issues/SVC-2441}}
{{LSL Function/physical|avatar=*}}
{{LSL Function/damping|tau}}
{{LSL Function/position|target|region=*}}
|func_id=70|func_sleep=0.0|func_energy=10.0
|func_id=70|func_sleep=0.0|func_energy=10.0
|func=llMoveToTarget|p1_type=vector|p1_name=target|p2_type=float|p2_name=tau
|func=llMoveToTarget
|func_footnote=To stop the object from maintaining the '''target''' positions use {{LSLG|llStopMoveToTarget}}<br/>
|p1_type=vector|p1_name=target
To change the rotation in the same manner use {{LSLG|llLookAt}} or {{LSLG|llRotLookAt}}.
|p2_type=float|p2_name=tau
|func_desc=Critically damp to '''target''' in '''tau''' seconds (if the script is physical)
|func_footnote=To stop the object from maintaining the {{LSLP|target}} positions use [[llStopMoveToTarget]]<br/>
To change the rotation in the same manner use [[llLookAt]] or [[llRotLookAt]].
|func_desc=Critically damp to {{LSLP|target}} in {{LSLP|tau}} seconds (if the script is physical)
|return_text
|return_text
|spec
|spec
|caveats
|caveats=* When slowly moving to a lower Z value, beware of {{jira|SVC-2441}} - the sim will incorrectly move the object down faster than it should. That is, if you try moving to llGetPos() + <10, 10, -10>, you can end up at .z-10 several meters before getting to .x-10 and .y-10. There is a demo object in the JIRA which shows this effect.
* A llMoveToTarget call seems to persist even if physics is turned off. This is a useful trick on sluggish sims where the object can drop a bit between the call to enable physics and the call to llMoveToTarget - just do the llMoveToTarget before setting the object to physical.
* <code>[[llVecDist]]([[llGetPos]](), {{LSLPT|target}})</code> must be ''less than'' 65, or no movement will occur.
* Calling llMoveToTarget with a {{LSLP|tau}} of {{HoverText|0.0|zero}} or less will silently fail, and do nothing. The smallest functional {{LSLP|tau}} is 0.044444444 (two physics frames, 2/45).
|constants
|constants
|examples======Will Move your object to a position=====
|examples=Drop this script in a prim to have it follow the prim owner.
<pre>
<source lang="lsl2">
// script created by SpiritWolf Chikuwa
//
// /!\ PUBLIC DOMAIN /!\
// You can Copy/Mod/Trans
// Please, do not resell this script and give it full perm
// Just please leave this header intact
//
// Minor changes: (insert your name here and delete this comment if you do any mod of this script, thank you)
//
// Script start here:
 
default
default
{
{
     state_entry() //i use for this example a "state_entry", so the item move the first second you
     state_entry()
                  //rez it, but if needed you can change it with something else like "touch_start",
                  //it's will move only if you click on it, the alternative of "stat_entry" is
                  //"on_rez", the item will move only if rezzed, and now directly when the script
                  // will be compiled
     {
     {
         llSetStatus(STATUS_PHYSICS | STATUS_PHANTOM, TRUE); // of course llSetStatus must be used
        vector pos = llGetPos();
// with physic (we move the item, and phantom, it's not needed, but better if the object must
         llSetStatus(STATUS_PHYSICS, TRUE);
// don't collide with something on his way. Also, it's physic, so be carefull, only 31 prims
        // Little pause to allow server to make potentially large linked object physical.
// for an item allowed.
        llSleep(0.1);
         llMoveToTarget(<53.654,199.364,502.542>, 10); // this is waht we want the llMoveToTarget,
        llMoveToTarget(pos,0.4);
// will move the item to the axes X,Y,Z localy on the curent sim where is the prim, in the 10
        // Look for owner within 20 meters in 360 degree arc every 1 seconds.
// on this exampel is the speed, actually, the item will move slowly
         llSensorRepeat("", llGetOwner(), AGENT, 20.0, PI,1.0);
    }
    sensor(integer total_number)
    {
        // Get position of detected owner
        vector pos = llDetectedPos(0);
        // Offset back one meter in X and up one meter in Z based on world coordinates.
        vector offset =<-1,0,1>;
//       offset = offset*llDetectedRot(0);  //Adding this line will orient the follower relative to the owner's position.
        pos+=offset;
        llMoveToTarget(pos,0.4);   
     }
     }
}
}
</pre>
</source>
|helpers
|helpers
|also_functions=*{{LSLG|llStopMoveToTarget}}
|also_functions={{LSL DefineRow||[[llStopMoveToTarget]]}}
*{{LSLG|llLookAt}}
{{LSL DefineRow||[[llLookAt]]}}
*{{LSLG|llRotLookAt}}
{{LSL DefineRow||[[llRotLookAt]]}}
*{{LSLG|llTarget}}
{{LSL DefineRow||[[llTarget]]}}
|also_tests
|also_tests
|also_events
|also_events

Latest revision as of 13:00, 22 January 2015

Summary

Function: llMoveToTarget( vector target, float tau );
0.0 Forced Delay
10.0 Energy

Critically damp to target in tau seconds (if the script is physical)

• vector target – position in region coordinates
• float tau – seconds to critically damp in

To stop the object from maintaining the target positions use llStopMoveToTarget
To change the rotation in the same manner use llLookAt or llRotLookAt.

Caveats

  • Only works in attachments and physics-enabled objects.
  • When slowly moving to a lower Z value, beware of SVC-2441 - the sim will incorrectly move the object down faster than it should. That is, if you try moving to llGetPos() + <10, 10, -10>, you can end up at .z-10 several meters before getting to .x-10 and .y-10. There is a demo object in the JIRA which shows this effect.
  • A llMoveToTarget call seems to persist even if physics is turned off. This is a useful trick on sluggish sims where the object can drop a bit between the call to enable physics and the call to llMoveToTarget - just do the llMoveToTarget before setting the object to physical.
  • llVecDist(llGetPos(), target) must be less than 65, or no movement will occur.
  • Calling llMoveToTarget with a tau of 0.0 or less will silently fail, and do nothing. The smallest functional tau is 0.044444444 (two physics frames, 2/45).

Examples

Drop this script in a prim to have it follow the prim owner. 

default
{
    state_entry()
    {
        vector pos = llGetPos();
        llSetStatus(STATUS_PHYSICS, TRUE);
        // Little pause to allow server to make potentially large linked object physical.
        llSleep(0.1);
        llMoveToTarget(pos,0.4);
        // Look for owner within 20 meters in 360 degree arc every 1 seconds.
        llSensorRepeat("", llGetOwner(), AGENT, 20.0, PI,1.0);
    }
    sensor(integer total_number)
    {
        // Get position of detected owner
        vector pos = llDetectedPos(0);
        // Offset back one meter in X and up one meter in Z based on world coordinates.
        vector offset =<-1,0,1>;
//        offset = offset*llDetectedRot(0);  //Adding this line will orient the follower relative to the owner's position.
        pos+=offset;
        llMoveToTarget(pos,0.4);     
    }
}

See Also

Functions

•  llStopMoveToTarget
•  llLookAt
•  llRotLookAt
•  llTarget

Deep Notes

Signature

function void llMoveToTarget( vector target, float tau );
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