What do i wrong with llSetLinkPrimitiveParams ?

I am making a pillow where i use a self made function but somehow it don't work like i espected

the function is:
AvatarSit(vector POSITION, vector Rotdeg, integer iNrAnim)
{
if(llGetNumberOfPrims()> iPrimsDefault)
{
llStopAnimation("sit";
llStopAnimation(SitAnim);
SitAnim=llGetInventoryName(INVENTORY_ANIMATION,iNrAnim);

POSITION=llGetPos()+ POSITION;
llOwnerSay((string)POSITION);

llSetLinkPrimitiveParams(iPrimsDefault +1, [PRIM_POSITION, POSITION, PRIM_ROTATION, llEuler2Rot(Rotdeg*= DEG_TO_RAD)]);
llStartAnimation(SitAnim);
}
}

when i call this function i give the offset compare to the root prim (have to do that for the rotation to but thats not implemented yet) and a integer with the number of the animation it has to load from the invertory.
iPrimsDefault is count of prims without anyone sitting on it.

llOwnerSay give the correct coordination but somehow i sit about 50 m away from the pillow and i don't understand why

EDIT: i am testing it with line POSITION=llGetPos()+ POSITION; disabled
it looks like that the Position is already relative to the root.
but after i move the pillow it the function sometimes don't work anymore and resetting the script don't work then (very weird)
but the rotations isn't relative to the root prim

Try llGetLocalPos().

i did it with llGetRot and that works too but now the position is wrong again.
because the pillow is more a rectangle and you rotate the pillow the x,y position aren't good anymore

but thanks for the answer.

You have to multiply the postition and the rotation by llGetRot() .
However I am not able to remember how exactly to do this so i'm hoping someone else steps in.

Thanks Ron and Rolig,

i understand what i did wrong now

I will try to figure out how to multiply the position with the rotation.
Wish i was better in math

When in doubt, consult the oracle .... .

thanks Rolig, for the laugh =)

::gave me a picture of myself blind, standing over a volcanic vent, high on toxic gases, saying "isn't it delicious?"::