// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Incoprea
// Touch-sampled heart silhouette
// 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: An algebraic silhouette test, not a signed distance function; scaling is centered on the face. 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 SIZE=0.8;
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(SIZE<=0.0)
        {
            llOwnerSay("Positive size required.");
            return;
        }
        float x=p.x/SIZE;
        float y=p.y/SIZE;
        float a=x*x+y*y-1.0;
        float value=a*a*a-x*x*y*y*y;
        llOwnerSay("Heart implicit value="+(string)value+" inside="+(string)(value<=0.0));
    }
}