// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Touch-sampled checkerboard cells
// Not compiled or tested in-world
// Setup: Put in a spare ordinary cube you own. Touch different places on one face to sample the procedural pattern at live surface coordinates. Edit the constants to design a pattern.
// Stop / restore: Disable/remove. Only private owner messages are produced; no texture or tint is applied.
// Notes: Parity is calculated from integer cell coordinates, so negativeUV values also remain deterministic. Surface coordinates depend on the viewer and mesh; ordinary prim faces are the clearest test surface.
// License: see LICENSE in this distribution.
// Original Incoprea. MIT. Live surface-coordinate sampler.
integer COLUMNS=8;
integer ROWS=8;
default
{
    touch_start(integer detectedCount)
    {
        if(llDetectedKey(0)!=llGetOwner())return;
        vector uv=llDetectedTouchST(0);
        if(llDetectedTouchFace(0)<0||uv==TOUCH_INVALID_TEXCOORD)
        {
            llOwnerSay("Surface coordinates unavailable.");
            return;
        }
        vector p=2.0*uv-<1.0,1.0,0.0>;
        if(COLUMNS<1||ROWS<1)
        {
            llOwnerSay("Positive grid counts required.");
            return;
        }
        integer x=llFloor(uv.x*COLUMNS);
        integer y=llFloor(uv.y*ROWS);
        llOwnerSay("Cell="+(string)x+","+(string)y+" checker="+(string)((x+y)&1));
    }
}