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Caño

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// «Caño» · gpt-6-sol (medium)
// A green warp pipe: a vertical cylinder of radius 14, 26 tall, bright green in 3 shades with a lighter vertical highlight stripe, topped by a wider rim (radius 17, 6 tall) with a dark hollow opening on top; flat bottom on the floor.

const cx = 24, cy = 24;
const bodyR = 14, rimR = 17, openingR = 11.5;

function surfaceShade(x, y, z, rim = false) {
  let color;
  if (x > 31) color = rim ? "#159a36" : "#148d32";
  else if (x < 20 || y < 19) color = rim ? "#43df5a" : "#35cc4b";
  else color = rim ? "#28bd43" : "#23ad3d";

  if (!rim && x >= 17 && x <= 19 && y < cy && z >= 3) {
    color = "#78f285"; // clean vertical highlight
  }
  if (rim && x >= 16 && x <= 19 && y < cy && z < 31) {
    color = "#69eb73";
  }
  return color;
}

// Flat-bottomed pipe shaft.
for (let z = 0; z <= 25; z++) {
  for (let x = 10; x <= 38; x++) {
    for (let y = 10; y <= 38; y++) {
      const d = Math.hypot(x - cx, y - cy);
      if (d > bodyR) continue;

      // Recess the opening deep into the shaft.
      if (z >= 19 && d < openingR) continue;

      let color = surfaceShade(x, y, z);
      if (z <= 1) color = x > 31 ? "#11752b" : "#198e32";
      if (z === 25 && d >= 12.5) color = "#188e33";
      if (z === 18 && d < openingR) color = "#103b25";
      set(x, y, z, color);
    }
  }
}

// Chunky overhanging lip, with an actual open center.
for (let z = 26; z <= 31; z++) {
  for (let x = 7; x <= 41; x++) {
    for (let y = 7; y <= 41; y++) {
      const d = Math.hypot(x - cx, y - cy);
      if (d > rimR || d < openingR) continue;

      let color = surfaceShade(x, y, z, true);
      if (z === 26) color = "#138d32";             // shadow under the lip
      if (z === 27 && d > 15.5) color = "#1daa3a";
      if (z === 31) {
        color = x > 32 ? "#35c94c" : "#70eb70";  // bright, broad top edge
        if (d < 13) color = "#47d65b";
      }
      // Dark inner wall makes the top read as a deep hollow opening.
      if (d < 12.7 && z < 31) {
        color = y > cy ? "#176d32" : "#10552a";
        if (z >= 29 && y > cy) color = "#208b3a";
      }
      set(x, y, z, color);
    }
  }
}