// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Frame-independent approach to a target
// Not compiled or tested in-world
// Setup: Put in a spare prim you own. Touch to simulate one second using ten small steps and four larger steps.
// Stop / restore: Disable or remove the script. It only reports to its owner and does not change prim properties. Reset clears its temporary state.
// Notes: The response constant is positive inverse-seconds. The constant target is important: changing targets between samples can produce different paths.
// License: see LICENSE in this distribution.
// Original Incoprea example. MIT. Owner-only calculation; no scene changes.
float approach(float value, float target, float response, float elapsed)
{
    if (elapsed <= 0.0) return value;
    if (response <= 0.0) return value;
    float weight = 1.0-llPow(2.718281828,-response*elapsed);
    return value+(target-value)*weight;
}
default
{
    touch_start(integer detectedCount)
    {
        if (llDetectedKey(0) != llGetOwner()) return;
        float a = 0.0;
        float b = 0.0;
        integer i;
        for (i=0; i<10; ++i) a=approach(a,10.0,3.0,0.1);
        for (i=0; i<4; ++i) b=approach(b,10.0,3.0,0.25);
        llOwnerSay("10 x 0.1 seconds: "+(string)a+"; 4 x 0.25 seconds: "+(string)b);
    }
    changed(integer change)
    {
        if (change & CHANGED_OWNER) llResetScript();
    }
}