llLookAt Equivalent for Child Prims

I am hoping someone can provide a function so that I won't need revisit trigonometry to re-invent this wheel. When a child prim executes llLookAt, it rotates the whole object. I want the parent to remain stationary.

Imagine a circle in the XY plane (flat cylinder and parent/root) with 12 linked child cones evenly space on the circle perimeter. Now imagine a ball positioned on the Z-axis over the center of the circle at an arbitrary height above it. I want ALL of the cones to point at that ball.

If these child cones were not linked, then llLookAt would work great, but since they ARE linked I assume I will be using llSetLocalRot. So what I want is the llLookAt equivalent for linked prims.

Thanks,
Dash

The following script has an approach you may be able to use, just substitute 'llSetRot' with 'llSetLocalRot'

vector lookat; // coordinates of point to look at
default
{
    state_entry()
    {
        llSetRot( llRotBetween( < 1.0, 0.0, 0.0 >, llVecNorm(lookat-llGetPos())));
    }

    moving_end()
    { // refresh after move
        llSetRot( llRotBetween( < 1.0, 0.0, 0.0 >, llVecNorm(lookat-llGetPos())));
    }
}

You may need to replace 'llGetPos' with 'llGetLocalPos'. That would depend on how you get the 'lookat' vector.

Note: < 1.0, 0.0, 0.0 > indicates that X is forward. You can use < 0.0, 0.0, 1.0 > if you want Z as forward and similar for Y forward.

Happy scripting

/me embraces the elegance of a simple solution and bows to Dora's wisdom