// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Surface normal probe
// Not compiled or tested in-world
// Setup: Put in the prim being inspected. Owner-touch a surface; the viewer must supply touch-normal data.
// Stop / restore: Remove or disable. It only reports to owner chat.
// Notes: Uses the visual touched surface normal, not a guarantee of the physics shape’s slope. A flat upward-facing surface is 0 degrees; a vertical wall is 90.
// License: see LICENSE in this distribution.
// Original Incoprea example. MIT. Not compiled or tested in-world.
default
{
    touch_start(integer count)
    {
        if (llDetectedKey(0) != llGetOwner()) return;
        vector normal = llDetectedTouchNormal(0);
        if (llVecMag(normal) < 0.1)
        {
            llOwnerSay("No usable touch normal returned.");
            return;
        }
        normal = llVecNorm(normal);
        float z = normal.z;
        if (z > 1.0) z = 1.0;
        if (z < -1.0) z = -1.0;
        llOwnerSay("Surface normal " + (string)normal + " | angle from up " + (string)(llAcos(z) * RAD_TO_DEG) + " degrees.");
    }
}