// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Touch-sampled crossed line families
// 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: The two families run at opposite slopes; line width is expressed in repeated-coordinate units. 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 REPEATS=6.0;
float LINE_WIDTH=0.1;
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(REPEATS<=0.0||LINE_WIDTH<=0.0||LINE_WIDTH>=0.5)
        {
            llOwnerSay("Invalid hatch settings.");
            return;
        }
        float a=(uv.x+uv.y)*REPEATS;
        float b=(uv.x-uv.y)*REPEATS;
        a=llFabs(a-llRound(a));
        b=llFabs(b-llRound(b));
        llOwnerSay("On hatch="+(string)(a<LINE_WIDTH||b<LINE_WIDTH)+" crossing="+(string)(a<LINE_WIDTH&&b<LINE_WIDTH));
    }
}