// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Angle between two directions
// Not compiled or tested in-world
// Setup: Edit A and B, then touch as owner.
// Stop / restore: Remove or disable the script. It does not change the build.
// Notes: The result is unsigned, from zero through 180 degrees. Zero vectors are rejected, and the dot product is clamped to prevent floating-point rounding from breaking acos.
// License: see LICENSE in this distribution.
// Original Incoprea example. MIT.
vector A = <1.0, 0.0, 0.0>;
vector B = <1.0, 1.0, 0.0>;
default
{
    touch_start(integer count)
    {
        if (llDetectedKey(0) != llGetOwner()) return;
        if (llVecMag(A) < 0.00001 || llVecMag(B) < 0.00001)
        {
            llOwnerSay("Both direction vectors must be nonzero.");
            return;
        }
        float dot = llVecNorm(A) * llVecNorm(B);
        if (dot > 1.0) dot = 1.0;
        if (dot < -1.0) dot = -1.0;
        llOwnerSay("Angle: " + (string)(llAcos(dot) * RAD_TO_DEG) + " degrees.");
    }
    changed(integer flags)
    {
        if (flags & CHANGED_OWNER) llResetScript();
    }
}