// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Face child toward root center
// Not compiled or tested in-world
// Setup: Use offset nonphysical child; owner-touch previews/restores.
// Stop / restore: Owner-touch again to restore the startup snapshot before removal or reset, unless setup describes a different cycle. Do not relink during a preview.
// Notes: Use a spare modifiable build. Saved state lives only in script memory. Roll is chosen by llRotBetween, not a camera-style up-vector constraint.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Not compiled or tested in-world.
integer preview;
rotation home;
default
{
    state_entry()
    {
        home=llGetLocalRot();
    }
    touch_start(integer n)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        if(llGetLinkNumber()<2||llGetStatus(STATUS_PHYSICS)||llVecMag(llGetLocalPos())<0.01)return;
        preview=!preview;
        if(preview)
        {
            llSetLinkPrimitiveParamsFast(LINK_THIS,[PRIM_ROT_LOCAL,llRotBetween(<1.0,0.0,0.0>,-llVecNorm(llGetLocalPos()))]);
        }
        else
        {
            llSetLinkPrimitiveParamsFast(LINK_THIS,[PRIM_ROT_LOCAL,home]);
        }
    }
}