link_message and llSetPrimitiveParams... possible bug!?

I know that llSetPrimitiveParams works in linked child objects... at least on touch.

I tried to put it into a link_message event, and suddenly it doesn't work.

I've tried debug echo statements to make sure that the code sections are being run, and such, and the echos come out fine, the objects don't change, though.

The code in question:

 default
{   
    link_message(integer sender_num, integer num, string str, key id)
    {
        if ( llToLower(str) == "up" )
        {
            llSetPrimitiveParams( [PRIM_SIZE, <1,1,.01>] );
        }
        
        if ( llToLower(str) == "down" )
        {
            llSetPrimitiveParams( [PRIM_SIZE, <1,1,3>] );
        }
    }
} 

I used your exact code in a child prim with the following in the root and it worked fine for me:

 integer up = 0;

default
{
    touch_start(integer total_number)
    {
        if(up)
        {
            up = 0;
            llMessageLinked(LINK_SET, 0, "down", NULL_KEY);
        }else{
            up = 1;
            llMessageLinked(LINK_SET, 0, "up", NULL_KEY);
        }
    }
} 

Would the fact that the object is physical at the time have anything to do with this? I don't recall seeing anything saying that it should...

It's all very weird.

Yup - the children of a physical link set can change their positions and rotations, but not their sizes. Changing size changes the object's mass, LL disabled the ability probably to stabalize some of Havok's quirkiness.
==Chris