// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Aim a ray through a physical display panel
// Not compiled or tested in-world
// Setup: Use a spare owned prim. Set EYE, PANEL_ORIGIN at lower-left, RIGHT/UP full-edge vectors and UV. Touch for private calculations.
// Stop / restore: Disable/remove. No camera or object settings are changed.
// Notes: RIGHT andUP define a plane and need not align with world axes. This is a virtual geometry model, not viewer camera control.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Transform planning only.
vector EYE=<0.0,0.0,2.0>;
vector PANEL_ORIGIN=<5.0,2.0,0.0>;
vector RIGHT=<0.0,-4.0,0.0>;
vector UP=<0.0,0.0,3.0>;
vector UV=<0.7,0.6,0.0>;
default
{
    touch_start(integer detectedCount)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        if(llVecMag(RIGHT%UP)<0.000001)
        {
            llOwnerSay("Panel edges are degenerate.");
            return;
        }
        vector target=PANEL_ORIGIN+RIGHT*UV.x+UP*UV.y;
        vector ray=target-EYE;
        if(llVecMag(ray)<0.000001)
        {
            llOwnerSay("Eye lies on target point.");
            return;
        }
        llOwnerSay("Panel point="+(string)target+" ray="+(string)llVecNorm(ray));
    }
}