// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Triangle coordinate inspector
// Not compiled or tested in-world
// Setup: Put in a spare prim you own. Edit triangle A/B/C and point P; touch. Use a point in the triangle plane.
// 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: Weights sum to one. Negative weights indicate an outside projection. A noncoplanar input is implicitly projected; degenerate triangles are rejected.
// License: see LICENSE in this distribution.
// Original Incoprea example. MIT. Owner-only calculation; no scene changes.
vector A = <0.0, 0.0, 0.0>;
vector B = <4.0, 0.0, 0.0>;
vector C = <0.0, 3.0, 0.0>;
vector P = <1.0, 1.0, 0.0>;
default
{
    touch_start(integer detectedCount)
    {
        if (llDetectedKey(0) != llGetOwner()) return;
        vector v0 = B - A;
        vector v1 = C - A;
        vector v2 = P - A;
        float d00 = v0 * v0;
        float d01 = v0 * v1;
        float d11 = v1 * v1;
        float d20 = v2 * v0;
        float d21 = v2 * v1;
        float denominator = d00 * d11 - d01 * d01;
        if (llFabs(denominator) < 0.000001)
        {
            llOwnerSay("Degenerate triangle.");
            return;
        }
        float v = (d11 * d20 - d01 * d21) / denominator;
        float w = (d00 * d21 - d01 * d20) / denominator;
        llOwnerSay("Weights A/B/C: " + (string)<1.0 - v - w, v, w>);
    }
    changed(integer change)
    {
        if (change & CHANGED_OWNER) llResetScript();
    }
}