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Global to Region Coordinates
Johnny Mann
Registered User
Join date: 1 Oct 2005
Posts: 202
05-05-2006 17:36
Hello everyone,

I am designing a pod that will bring me anywhere I want to. Everything works great in the sim it is in. BUT...

I can't figure out how to transform Global coordinates into Region Coordinates.

I know how to get the global coordinates (I used a script that basically Says them outloud)

Does anyone know the equation to transform Global into a region Vector that I can use with llSetPos ?

Thanks!
Sky Honey
Coder
Join date: 16 May 2005
Posts: 105
05-05-2006 17:51
Yup! Right here
_____________________
Mappa Novi
Registered User
Join date: 15 Jan 2007
Posts: 3
02-25-2007 07:54
From: Sky Honey
Yup! Right here


Page does not exist anymore! Would really like to find out how to do this.. does anyone have an updated link/info on how to do this?
Elsewhere Essex
Registered User
Join date: 8 Sep 2006
Posts: 50
02-25-2007 15:47
CODE

//take your global postion and substract the region corner of the current sim from it
vector global2regional = youstoredglobalpos - llGetRegionCorner();

http://lslwiki.org/index.php/GlobalCoordinate
Jeff Kelley
Registered User
Join date: 8 Nov 2006
Posts: 223
02-25-2007 19:05
Not sure global coordinates work correctly.
CODE

        vector pos = llGetPos();
        llSetPos(pos+<1,0,0>);

will move you one meter but
CODE

        pos = llGetPos()+llGetRegionCorner();
        llSetPos(pos+<1,0,0>);

will not.

Anyway, you will be lucky if you can travel more than half a sim without being screwed by a ban line. I'm trying to experiment and I crash (loop, hang, ends in weird states forcing logout) because my north and west neighbours use "NO ENTRY" and "BUY PASS" lines, and south and east are off-world.

You can detect out-of-world condition with llEdgeOfWorld(vector pos, vector dir) before jumping, but I've found no way to detect various ban conditions.
Elsewhere Essex
Registered User
Join date: 8 Sep 2006
Posts: 50
02-25-2007 20:07
From: Jeff Kelley
Not sure global coordinates work correctly.
CODE

        vector pos = llGetPos();
        llSetPos(pos+<1,0,0>);

will move you one meter but
CODE

        pos = llGetPos()+llGetRegionCorner();
        llSetPos(pos+<1,0,0>);

will not.

Anyway, you will be lucky if you can travel more than half a sim without being screwed by a ban line. I'm trying to experiment and I crash (loop, hang, ends in weird states forcing logout) because my north and west neighbours use "NO ENTRY" and "BUY PASS" lines, and south and east are off-world.

You can detect out-of-world condition with llEdgeOfWorld(vector pos, vector dir) before jumping, but I've found no way to detect various ban conditions.


llGetPos() is region local coords
your math of llGetPos() + llGetRegionCorner() is how one woud get a global position

if you look a litte more colosely at mylast post, i posted
pos - llGetRegionCorner(), which assumes that pos is already a global position and subracting the region corner from it would give you a region local position vector.
Jeff Kelley
Registered User
Join date: 8 Nov 2006
Posts: 223
02-26-2007 04:21
From: Elsewhere Essex
llGetPos() is region local coords
your math of llGetPos() + llGetRegionCorner() is how one woud get a global position

I had misuderstood the wiki example, assuming it was trying to llSetPos to a global position, when it was really llSetPos-ing to an offset between global positions:
CODE

// Pass a global position to this function, and the object
// will move there. 
setGlobalPos(vector globalDest) {
    vector localDest;
    do {
        localDest = globalDest - llGetRegionCorner();
        llSetPos(localDest);
    } while (llVecDist(llGetPos(), ....localDest) > 0.1);
}

default {
    state_entry() {
        vector DABOOM_CORNER = <256000, 256000, 0>; // DaBoom's region corner.
        setGlobalPos(DABOOM_CORNER + <128, 128, 128>); // Travel to <128,128,128> in DaBoom.
    }
}

Suppose we are in Luna <128,128,128>+<254464, 256000, 0>. localDest would evaluate to <256128, 256128, 128> - <254464, 256000, 0> = <1664,128,128>. The loop will move us 10 meters east to and llGetPos() evaluate to <138,128,128>... Tricky. But I'm still in Luna, bouncing on and off near my starting position :(
Mappa Novi
Registered User
Join date: 15 Jan 2007
Posts: 3
02-26-2007 16:16
From: Jeff Kelley
I had misuderstood the wiki example, assuming it was trying to llSetPos to a global position, when it was really llSetPos-ing to an offset between global positions:


In my case I am fine with using the Map to teleport, however llMapDestination() requires a region name and local coordinates. Anyway to get that conversion from the global coords? (short of trying to warpPos over there to find out ;) )
Talarus Luan
Ancient Archaean Dragon
Join date: 18 Mar 2006
Posts: 4,831
02-26-2007 16:31
The destination of llMapDestination is relative to the corner of the specified region name. IE, if you have global coordinate vector GlobalPos = <Gx,Gy,Gz>, then the correct llMapDestination call to get to it from the avatar's current position would be:

CODE

    llMapDestination(llGetRegionName(),  GlobalPos - llGetRegionCorner(), ZERO_VECTOR);


When the third parameter is implemented, I suppose it will be the Euler representation of the destination rotation for the avatar.
Mappa Novi
Registered User
Join date: 15 Jan 2007
Posts: 3
02-26-2007 16:53
Perfect... and obvious now. Thanks for the help!