// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Touch-sampled staggered brick mortar
// 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: Mortar width is expressed as a fraction of each cell, so horizontal and vertical physical widths differ if cells differ in aspect. 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.
float COLUMNS=4.0;
float ROWS=6.0;
float MORTAR=0.08;
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<=0.0||ROWS<=0.0||MORTAR<0.0||MORTAR>=0.5)
        {
            llOwnerSay("Invalid brick settings.");
            return;
        }
        float y=uv.y*ROWS;
        integer row=llFloor(y);
        float x=uv.x*COLUMNS;
        if(row&1)x+=0.5;
        x-=llFloor(x);
        y-=llFloor(y);
        integer mortar=(x<MORTAR||x>1.0-MORTAR||y<MORTAR||y>1.0-MORTAR);
        llOwnerSay("Row="+(string)row+" mortar="+(string)mortar);
    }
}