How to know the position of a prim

Hi!

I need to know the position of a single prim from which I know the name, there are a lot of other single prims around, so the number will be 0 for all of them.

llDetectedPos detects the position of the prim number...
And a Sensor doesn't detect position (i think...)

Any suggestion?

Thanks

if you do a sensor, and then do llDetectedPos on the prim number of the prim with the name you know which was detected...

How do you know the prim number from a sensor?

The sensor will return up to 16 items which can be accessed via the llGetDetected functions.

I have used this and it doesn't work

   default
   {    touch_start(integer  total_number)
    {
    llSensor("prim_to_detect",NULL_KEY,PASSIVE,96,PI);
    }    sensor(integer  total_number)
    {
    vector Posi;
    Posi =  llDetectedPos(total_number);
    llOwnerSay("position X is:  " + (string)Posi.x + " and for Y: " + (string)Posi.y);
    }   }  
   

Er, hang on a sec... llDetectedPos( 0 ) doesn't reference Prim #0 of a detected linkset, it references the first detected object/agent in the array of accessible objects/agents of n length, passed to the event handler (e.g. touch*(), sensor(), collision*() )

So, if touch_start is raised, and 5 is the number passed to it, llDetected*( 0 ) will return info on the first agent in that array, llDetected*( 1 ) the second, and so on, up through llDetected*( 4 ).

Since you're only dealing with unlinked prims, you can just do a llSensor for the name of the object you're interested in, and if there's only 1 object with that name of the specified type within the specified range, the sensor() event will be raised with 1 passed to it, and llDetected*( 0 ) will return info on that object (the type of info depending on what * is, of course.)

I don't believe llDetected*() can ever return info on child prims of a linkset, other than llDetectedLinkNumber() in the touch*() hander of a root prim, and even then, only info about it's own children.

This is the error. total_number is the length of the array of sensed objects/avatars. But since array indexes start with 0, the last element of the array will always be length - 1. e.g., if you have an array of size 5, the elements will be indexed as 0 through 4. Trying to use total_number as a reference guarantees you'll always overshoot the array by one.

If you only expect one object to be sensed, use llDetectedPos( 0 ).

That is what i was trying to explain from the first post.

Then Is it possible to know the position of a single prim (PASSIVE), with a sensor or in any other way, in a script placed in another single prim?

Thanks.

Yes, the script you posted above, with the single change I describe above, should do exactly that.

There is a radar script in the wiki libary

http://www.lslwiki.net/lslwiki/wakka.php?wakka=LibraryRadar

Change the value of scantype. In the library you will see
integer scanType = AGENT;
change to
integer scanType = PASSIVE;

Yes Deanna, that works thank you.

I'll check that one in the wiki library too. thanks a lot.