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Roca con algas

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Roca con algasArrastrá para girarlo
// «Roca con algas» · gpt-6-sol (medium)
// A rounded dark grey sea rock with green seaweed hanging down its sides, a few barnacles and a small puddle of turquoise water at its foot.

// Shallow turquoise puddle and sandy edge.
for (let x = 2; x <= 45; x++) {
  for (let y = 6; y <= 43; y++) {
    const dx = (x - 24) / 21;
    const dy = (y - 25) / 17;
    const ripple = 0.055 * Math.sin(x * 0.63) + 0.04 * Math.cos(y * 0.81);
    const d = dx * dx + dy * dy + ripple;

    if (d < 1.15) set(x, y, 0, "#e9cf91");
    if (d < 1.0) {
      set(x, y, 0, d > 0.83 ? "#79dfd5" : "#20b8bc");
      if (d < 0.88) set(x, y, 1, d > 0.69 ? "#55d6cf" : "#28c8c8");
    }
  }
}

// Rounded, slightly lopsided sea rock.
ellipsoid(24, 25, 14, 17, 15, 14, "#51565a");
ellipsoid(19, 25, 14, 11, 13, 14, "#51565a");
ellipsoid(30, 27, 11, 10, 11, 10, "#51565a");
ellipsoid(13, 26, 7, 6, 9, 6, "#51565a");
ellipsoid(36, 25, 7, 5, 8, 6, "#51565a");

const rockColors = new Set(["#51565a", "#41494c", "#626b6c", "#737c79"]);
forEach((x, y, z, color) => {
  if (!rockColors.has(color)) return;
  let shade = z > 20 ? "#626b6c" : z < 8 ? "#41494c" : "#51565a";
  if (rand() < 0.13) shade = z > 15 ? "#737c79" : "#41494c";
  set(x, y, z, shade);
});

// Look up the exposed front or side of the rock, so the seaweed hugs its shape.
function frontY(x, z) {
  for (let y = 7; y < 43; y++) {
    if (rockColors.has(get(x, y, z))) return y;
  }
  return null;
}
function sideX(y, z) {
  for (let x = 43; x >= 5; x--) {
    if (rockColors.has(get(x, y, z))) return x;
  }
  return null;
}

// Long, chunky ribbons of seaweed dangling over the front.
for (const [base, top, bottom, phase] of [
  [14, 24, 9, 0.3],
  [20, 27, 6, 1.7],
  [27, 27, 10, 3.2],
  [34, 24, 7, 4.6]
]) {
  for (let z = top; z >= bottom; z--) {
    const x = Math.round(base + 1.3 * Math.sin(z * 0.38 + phase));
    const y = frontY(x, z);
    if (y === null) continue;

    const green = z % 5 < 2 ? "#398b46" : "#28763e";
    box(x - 1, y - 2, z, x + 1, y - 1, z, green);
    set(x - 1, y - 3, z, "#4cac52");
    if (z % 4 === 0) {
      set(x + 2, y - 1, z, "#398b46");
      set(x + 2, y - 1, z - 1, "#28763e");
    }
    if (z % 5 === 2) {
      set(x - 2, y - 1, z, "#4cac52");
      set(x - 2, y - 1, z - 1, "#28763e");
    }
  }
}

// More seaweed spilling down the rock's right-hand side.
for (const [baseY, top, bottom, phase] of [
  [21, 24, 8, 0.4],
  [29, 24, 10, 2.2]
]) {
  for (let z = top; z >= bottom; z--) {
    const y = Math.round(baseY + Math.sin(z * 0.4 + phase));
    const x = sideX(y, z);
    if (x === null) continue;
    box(x + 1, y - 1, z, x + 2, y + 1, z, "#28763e");
    set(x + 3, y - 1, z, "#4cac52");
    if (z % 4 === 1) set(x + 1, y + 2, z, "#398b46");
  }
}

// Small ivory barnacles, each with a dark opening facing the viewer.
for (const [x, z, r] of [
  [16, 15, 2], [31, 14, 2], [36, 10, 2],
  [11, 9, 1], [25, 8, 1], [30, 7, 1]
]) {
  const surface = frontY(x, z);
  if (surface === null) continue;
  const y = surface - 2;
  sphere(x, y, z, r, "#f2e7be");
  set(x, y - r, z, "#977e68");
  set(x, y - r, z + 1, "#fff5d5");
}

// Bright glints and little foam flecks in exposed water.
for (let x = 5; x <= 43; x++) {
  for (let y = 9; y <= 41; y++) {
    if (get(x, y, 1) !== "#28c8c8" && get(x, y, 1) !== "#55d6cf") continue;
    if (get(x, y, 2)) continue;
    if ((x * 7 + y * 11) % 47 === 0) set(x, y, 2, "#b6f5dc");
    else if ((x * 13 + y * 3) % 61 === 0) set(x, y, 2, "#72e5d6");
  }
}