Relavit position from Global position

I want to, by script, position several objects (children prims) relative to a central object (parent prim), but using Global co-ordinates - all prims will be in the same sim and within 10 metres of the parent. Preferrably I want to use the prim name, not its key.

Can it be done? and if so how?

What you're saying doesn't really make much sense, can you restate what you're trying to do, and be a little more descriptive?

OK - point taken


Imagine you have a single prim called "parent" sitting in a region.

You then create three other prims called Child1, Child2 and Child3 somethere close by within the same region

I want to reposition them (using a script) to specific positions relative to the 'Parent' using global or world x,y,z co-ordinates.

The parent can be placed anywhere within the region.

Hope that is better - thanks for your interest

You want region coordinates. Global coordinates look at the whole grid but that is not important here. When you say children do you mean all the prims are linked together?

default {
	touch_start(integer n) {
		integer linkNum = 2;
		vector childNewPos = <85,24,601>;
		llSetLinkPrimitiveParams(linkNum,[PRIM_POSITION,childNewPos - llGetPos()]);
	}
}

This is taking the destination and subtracting the root position to get the offset and then applying that to the child.
You could also throw in a magnitude check to make sure the move is less then 10 meters from the root position.

I'll assume you mean you have an offset, and you want the region coordinates from that for unlinked objects, right?

add your offset to the base objects detected position, there's your region coordinates

if you want it relative to the rotation of the base object, multiply the offset by the base objects rotation before adding it's position

moving, detecting, and/or messaging between the objects is up to the reader.

Heyaz.

vector Global2Local(vector vGlobalPos)
{
return vGlobalPos - llGetRegionCorner();
}
vector Local2Global(vector vLocalPos)//added just for symetry
{
return vLocalPos + llGetRegionCorner();
}

integer GetLinkNumberFromName(string szPrimName)
{
integer nTotalPrims = llGetNumberOfPrims();
integer i = 1;
while(i <= nTotalPrims)
{
string szTmpName = llGetLinkName(i);
if(szTmpName == szPrimName)
return i;

i++;
}
return -1;//not found
}
// This should do what you want if I'm understanding you correctly. Again, it's only for moving inside one sim. There is no error checking that the position you want to move to is within 10m of the last position.
MoveChildGlobal(vector vGlobal, string szPrimName)
{
vector vNextPos = Global2Local(vGlobal);//must convert to local coords since llSetLinkPrimitiveParams expects local vectors

integer nLinkNumber = GetLinkNumberFromName(szPrimName);//assumes all prims have unique names

if(nLinkNumber != -1)
llSetLinkPrimitiveParams(nLinkNumber,[PRIM_POSITION,vNextPos]);
else
llOwnerSay("Doh! " + szPrimName + " not found.";

}

Honestly, what I would recommend you do would be just convert your global coords to local before any movement calls though.

Hope this helps.

~Az

Az - thanks, I think you have hit it on the head - will test and see - Thanks everyone - seems I caused a little confusion