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Serrucho

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// «Serrucho» · gpt-6-sol (medium)
// Hand saw («Serrucho»).

// Hand saw: a thin, rising steel blade with a chunky wooden loop handle.
const bladeFront = 20;
const bladeBack = 24;

function topEdge(x) { return Math.round(18 + (x - 4) * 0.5); }
function bottomEdge(x) { return Math.round(8 + (x - 4) * 0.43); }

// Solid blade, with a brighter front face and a dark lower cutting edge.
for (let x = 4; x <= 36; x++) {
  const lo = bottomEdge(x), hi = topEdge(x);
  for (let z = lo; z <= hi; z++) {
    for (let y = bladeFront; y <= bladeBack; y++) {
      const t = (z - lo) / (hi - lo);
      let c;
      if (z === lo) c = "#64787e";
      else if (z === hi) c = "#aab8b9";
      else if (y === bladeFront) {
        c = t > 0.69 ? "#a9b8ba" : t > 0.34 ? "#91a5aa" : "#7e939a";
        if (rand() < 0.065) c = t > 0.5 ? "#bdc9c8" : "#71878f";
      } else {
        c = t > 0.65 ? "#84999d" : "#6e838a";
      }
      set(x, y, z, c);
    }
  }
}

// A narrow bevel follows the upper edge; staggered chips texture the steel.
for (let x = 6; x <= 34; x++) {
  const hi = topEdge(x), lo = bottomEdge(x);
  set(x, 19, hi - 2, x % 5 === 0 ? "#c4cfcc" : "#aabbbd");
  if (x % 4 !== 1) set(x, 19, hi - 3, "#a3b5b7");
  if (x % 5 < 3) {
    const z = lo + 4 + Math.floor((hi - lo - 8) * (x % 3) / 3);
    set(x, 19, z, x % 2 ? "#9aadb0" : "#859ba2");
    if (x % 3 === 0) set(x + 1, 19, z, "#a3b5b7");
  }
}

// Small, regular steel teeth along the sloping upper and lower edges.
for (let x = 8; x <= 32; x += 3) {
  const z = topEdge(x);
  set(x, 21, z + 1, "#63787f");
  set(x + 1, 21, z + 1, "#879b9f");
  set(x + 1, 21, z + 2, "#8fa3a6");
  set(x + 1, 20, z + 2, "#aab8b8");
}
for (let x = 5; x <= 34; x += 3) {
  const z = bottomEdge(x);
  set(x, 21, z - 1, "#687d84");
  set(x, 21, z - 2, "#748990");
  set(x + 1, 21, z - 1, "#82969a");
  set(x, 20, z - 1, "#8da0a3");
}

// Squared-off nose and its first prominent tooth.
box(3, 20, 8, 4, 23, 18, "#84979c");
box(3, 19, 9, 3, 19, 18, "#a7b6b7");
box(4, 20, 6, 4, 22, 8, "#75898f");

// The handle is a thick wooden ring; its opening goes all the way through.
function handleShape(x, z) {
  const left = x >= 34 && x <= 38 && z >= 28 && z <= 39;
  const crown = x >= 36 && x <= 42 && z >= 38 && z <= 40;
  const topStep = x >= 37 && x <= 40 && z === 41;
  const right = x >= 42 && x <= 44 && z >= 30 && z <= 38;
  const heel = x >= 40 && x <= 43 && z >= 27 && z <= 32;
  const bottom = x >= 37 && x <= 42 && z >= 25 && z <= 28;
  const lowerNeck = x >= 35 && x <= 39 && z >= 27 && z <= 31;
  const opening = x >= 39 && x <= 41 && z >= 31 && z <= 36;
  return (left || crown || topStep || right || heel || bottom || lowerNeck) && !opening;
}

for (let x = 34; x <= 44; x++) {
  for (let z = 25; z <= 41; z++) {
    if (!handleShape(x, z)) continue;
    for (let y = 17; y <= 27; y++) {
      let c;
      if (y === 17) c = "#a55c25";
      else if (y <= 19) c = "#aa6129";
      else if (y >= 26) c = "#713b1e";
      else c = "#8b491f";
      if (z >= 38) c = y <= 20 ? "#bd762f" : "#945022";
      if (z <= 28) c = y <= 20 ? "#8e4b20" : "#693719";
      if (x >= 43) c = y <= 19 ? "#985021" : "#71391b";
      if (rand() < 0.075) c = y <= 20 ? "#cf8738" : "#6d351b";
      set(x, y, z, c);
    }
  }
}

// Faceted golden edge highlights and dark recess around the finger opening.
for (let x = 36; x <= 41; x++) {
  set(x, 16, 40, x % 3 ? "#d59643" : "#e6ab56");
  if (x <= 40) set(x, 17, 41, "#a9652c");
}
for (let z = 34; z <= 37; z++) {
  set(43, 16, z, z % 2 ? "#b46b2a" : "#cf8637");
}
for (let x = 38; x <= 41; x++) {
  set(x, 16, 27, x % 2 ? "#b16b2c" : "#d28c3b");
}
for (let z = 31; z <= 36; z++) {
  if (handleShape(38, z)) set(38, 17, z, "#70401e");
  if (handleShape(42, z)) set(42, 17, z, "#75401d");
}
for (let x = 39; x <= 41; x++) {
  set(x, 17, 37, "#75421e");
  set(x, 17, 30, "#63381d");
}

// Gold-toned joints and square rivets securing blade to handle.
box(34, 16, 33, 37, 16, 34, "#75401d");
box(35, 15, 33, 36, 15, 34, "#e6ae55");
set(35, 14, 34, "#f1c477");
set(36, 14, 33, "#bd792c");

box(35, 16, 27, 38, 16, 28, "#75401d");
box(36, 15, 27, 37, 15, 28, "#d49642");
set(36, 14, 28, "#f0ba61");
set(37, 14, 27, "#b97129");

// Broad wooden facets make the grip readable at small sizes.
box(35, 16, 36, 36, 16, 39, "#d08c3b");
set(37, 16, 39, "#f1b861");
box(42, 16, 32, 42, 16, 34, "#c27a30");
set(40, 16, 26, "#dc9946");

// Move the finished saw down so its lowest block rests on the floor at z = 0.
const blocks = [];
forEach((x, y, z, color) => blocks.push([x, y, z, color]));
for (const [x, y, z] of blocks) set(x, y, z, null);
for (const [x, y, z, color] of blocks) set(x, y, z - 6, color);