// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Touch-sampled wavy grid coordinates
// 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: Warp amplitude is inUV units; large amplitudes fold the visual grid but do not change actual geometry. 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 WARP=0.08;
float LINE=0.06;
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<=0.0||LINE>=0.5)
        {
            llOwnerSay("Invalid grid settings.");
            return;
        }
        float x=(uv.x+WARP*llSin(TWO_PI*uv.y*2.0))*REPEATS;
        float y=uv.y*REPEATS;
        float dx=llFabs(x-llRound(x));
        float dy=llFabs(y-llRound(y));
        llOwnerSay("Warped grid line="+(string)(dx<LINE||dy<LINE));
    }
}