// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Decode a normal-map pixel
// Not compiled or tested in-world
// Setup: Use a spare owned prim. Set encoded PIXEL. Touch for owner-only numeric output.
// Stop / restore: Remove/disable; no colors or materials are applied.
// Notes: Channel conventions vary, especially the green/Y channel. A neutral pixel should be near<0.5,0.5,1>.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Color calculation only.
vector PIXEL=<0.65,0.4,0.95>;
default
{
    touch_start(integer detectedCount)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        if(PIXEL.x<0.0||PIXEL.y<0.0||PIXEL.z<0.0||PIXEL.x>1.0||PIXEL.y>1.0||PIXEL.z>1.0)
        {
            llOwnerSay("Pixel must be0..1.");
            return;
        }
        vector normal=2.0*PIXEL-<1.0,1.0,1.0>;
        if(llVecMag(normal)<0.000001)
        {
            llOwnerSay("Pixel encodes a zero vector.");
            return;
        }
        llOwnerSay("Tangent normal="+(string)llVecNorm(normal));
    }
}