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Moneda

by fogonCC04256 blocks
MonedaDrag to turn it
// «Moneda» · gpt-6-sol (medium)
// A big shiny gold coin standing upright, facing -y: a disc of radius 15 and 4 blocks thick (axis y), centered at x 24, with its lowest point touching z 0 (center about z 15). A raised 2-block rim in brighter gold, a recessed face in deeper gold, and a raised star emblem in the middle; a white-yellow highlight on the upper left of the rim. 3-4 shades of gold. The whole coin is one part that spins and bobs.

part("moneda", [24, 24, 15]);

const cx = 24;
const cz = 15;
const radius = 15;

function inStar(x, z) {
  const points = [];
  for (let i = 0; i < 10; i++) {
    const a = Math.PI / 2 + i * Math.PI / 5;
    const r = i % 2 === 0 ? 9 : 4.1;
    points.push([cx + Math.cos(a) * r, cz + Math.sin(a) * r]);
  }

  let inside = false;
  for (let i = 0, j = 9; i < 10; j = i++) {
    const [xi, zi] = points[i];
    const [xj, zj] = points[j];
    if ((zi > z) !== (zj > z) &&
        x < (xj - xi) * (z - zi) / (zj - zi) + xi) {
      inside = !inside;
    }
  }
  return inside;
}

// Four-block-thick body, with a deeper-gold recessed face.
for (let x = 9; x <= 39; x++) {
  for (let z = 0; z <= 30; z++) {
    const d = Math.hypot(x - cx, z - cz);
    if (d > radius) continue;

    for (let y = 22; y <= 25; y++) {
      let color = "#efa923";
      if (y === 22 || y === 25) {
        color = z > 17 ? "#e5a022" : "#d9911b";
        if (x < 21 && z > 17) color = "#efac29";
        if (rand() < 0.025) color = "#e9a425";
      } else if (d > 13.5) {
        color = z > 15 ? "#f8bc36" : "#cf8518";
      }
      set(x, y, z, color);
    }

    // Narrow engraved circle just inside the raised rim.
    if (d >= 10.7 && d < 11.25) {
      const engraving = x < 24 && z > 15 ? "#ffd052" : "#b87919";
      set(x, 22, z, engraving);
      set(x, 25, z, engraving);
    }

    // Two-block raised rim on both faces.
    if (d >= 12.15) {
      const upperLeft = x <= 22 && z >= 21;
      const glint = x >= 12 && x <= 20 && z >= 24 && d >= 13.3;
      let rim = z >= 16 ? "#ffd044" : "#e7a321";
      if (upperLeft) rim = "#ffdd63";
      if (glint) rim = "#fff3a3";
      if (d < 12.75) rim = "#f7b936";

      for (const y of [20, 21, 26, 27]) {
        set(x, y, z, rim);
      }
    }
  }
}

// Soft dark-gold edging beneath the raised star.
for (let x = 14; x <= 34; x++) {
  for (let z = 5; z <= 25; z++) {
    if (Math.hypot(x - cx, z - cz) >= 11) continue;
    if (!inStar(x, z) &&
        (inStar(x - 1, z) || inStar(x + 1, z) ||
         inStar(x, z - 1) || inStar(x, z + 1))) {
      set(x, 22, z, "#ae7017");
      set(x, 25, z, "#ae7017");
    }
  }
}

// Chunky five-point star, raised two blocks from the recessed face.
for (let x = 14; x <= 34; x++) {
  for (let z = 5; z <= 25; z++) {
    if (!inStar(x, z)) continue;

    const edge = !inStar(x - 1, z) || !inStar(x + 1, z) ||
                 !inStar(x, z - 1) || !inStar(x, z + 1);

    set(x, 21, z, "#d58d17");
    set(x, 26, z, "#d58d17");

    const gold = edge
      ? (x < cx && z > cz ? "#ffe16a" : "#e6a52b")
      : (x < cx && z > cz ? "#ffeb83" : "#ffd34a");
    set(x, 20, z, gold);
    set(x, 27, z, gold);
  }
}

animate("moneda", { type: "spin", axis: "z", speed: -2 });
animate("moneda", { type: "bob", axis: "z", amplitude: 1.5 });