TSL snippets

saturation.js

 const sat = Fn(([rgb,intensity])=> {
    const L = vec3(0.2125, 0.7154, 0.0721);
    const grayscale = vec3(dot(rgb, L));
    return mix(grayscale, rgb, intensity); 
  });

uv borders.js

  const uvBorder = Fn(([uv, width]) => {
    let uv1 = uv;
    let uv2 = uv.oneMinus()
    let d = fwidth(uv1);
    let d1 = fwidth(uv2);

    let s = smoothstep(
      mul(d, add(width, 0.5)),
      mul(d, sub(width, 0.5)),
      uv1
    );
    let s1 = smoothstep(
      mul(d1, add(width, 0.5)),
      mul(d1, sub(width, 0.5)),
      uv2
    );
    let alpha = max(s.x, s.y);
    let alpha1 = max(s1.x, s1.y);
    let finalAlpha = max(alpha, alpha1);

    return finalAlpha;

  })