// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Intersection line of two planes
// Not compiled or tested in-world
// Setup: Use a spare owned prim. Set normal N1/N2 and scalar offsets D1/D2 for equations n dot x = d. Touch for owner-only results.
// Stop / restore: Disable/remove. No scene properties change.
// Notes: Normals need not be unit length. Nearly parallel planes are rejected; output is an infinite line.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT.
vector N1=<0.0,0.0,1.0>;
float D1=2.0;
vector N2=<1.0,1.0,0.0>;
float D2=4.0;
default
{
    touch_start(integer detectedCount)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        vector direction=N1%N2;
        float denominator=direction*direction;
        if(denominator<0.000001)
        {
            llOwnerSay("Parallel planes or zero normals.");
            return;
        }
        vector point=((D1*N2-D2*N1)%direction)/denominator;
        llOwnerSay("Point="+(string)point+"; direction="+(string)llVecNorm(direction));
    }
}