// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Classify a sphere against a plane
// Not compiled or tested in-world
// Setup: Use a spare owned prim. Set sphere center/radius and plane point/normal. Touch for owner-only calculation output.
// Stop / restore: Remove/disable. Does not sense, collide with, or modify actual objects.
// Notes: Classification concerns an ideal sphere; a zero normal is rejected.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Ideal geometry only.
vector CENTER=<1.0,2.0,3.0>;
float RADIUS=1.5;
vector ON_PLANE=<0.0,0.0,2.0>;
vector NORMAL=<0.0,0.0,1.0>;
default
{
    touch_start(integer detectedCount)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        if(RADIUS<0.0||llVecMag(NORMAL)<0.000001)
        {
            llOwnerSay("Invalid radius/normal.");
            return;
        }
        float d=(CENTER-ON_PLANE)*llVecNorm(NORMAL);
        string result="intersects plane";
        if(d>RADIUS)result="entirely positive";
        else if(d< -RADIUS)result="entirely negative";
        llOwnerSay(result+"; signed center distance="+(string)d);
    }
}