// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Convert a hue wheel setting into RGB
// Not compiled or tested in-world
// Setup: Use a spare owned prim. Set HUE, SATURATION and VALUE; latter two in0..1. Touch for owner-only numeric output.
// Stop / restore: Remove/disable; no colors or materials are applied.
// Notes: Hue wraps cyclically. The calculation uses HSV, whose equal value is not equal perceived brightness.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Color calculation only.
float HUE=145.0;
float SATURATION=0.7;
float VALUE=0.8;
default
{
    touch_start(integer detectedCount)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        if(SATURATION<0.0||SATURATION>1.0||VALUE<0.0||VALUE>1.0)
        {
            llOwnerSay("Saturation/value must be0..1.");
            return;
        }
        float h=HUE/60.0;
        h-=6.0*llFloor(h/6.0);
        float c=VALUE*SATURATION;
        float rem=h-2.0*llFloor(h/2.0);
        float x=c*(1.0-llFabs(rem-1.0));
        vector rgb;
        if(h<1.0)rgb=<c,x,0.0>;
        else if(h<2.0)rgb=<x,c,0.0>;
        else if(h<3.0)rgb=<0.0,c,x>;
        else if(h<4.0)rgb=<0.0,x,c>;
        else if(h<5.0)rgb=<x,0.0,c>;
        else rgb=<c,0.0,x>;
        float m=VALUE-c;
        llOwnerSay("RGB="+(string)(rgb+<m,m,m>));
    }
}