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← Nature3D assetfogon/roca-mediana

Roca mediana

by fogonCC013141 blocks
Roca medianaDrag to turn it
// «Roca mediana» · gpt-6-sol (medium)
// A medium irregular boulder in grey stone with a few cracks and green moss patches on top, about 30 blocks across.

// A chunky, irregular storybook boulder.
const cx = 24, cy = 24;
const stone = ["#929b9b", "#a8b0ad", "#bcc4bd", "#d0d7ca"];
const moss = ["#3f8f48", "#58ae52", "#73c961", "#91dc72"];

for (let x = 6; x <= 42; x++) {
  for (let y = 7; y <= 41; y++) {
    const dx = x - cx, dy = y - cy;
    const angle = Math.atan2(dy, dx);
    const ripple = 1
      + 0.065 * Math.sin(5 * angle + 0.5)
      + 0.045 * Math.cos(9 * angle - 0.8);

    const d = Math.pow(dx / (17 * ripple), 2)
            + Math.pow(dy / (15.5 * ripple), 2);
    if (d >= 1) continue;

    const top = Math.floor(
      4.5 + 16.5 * Math.sqrt(1 - d)
      + 0.75 * Math.sin(x * 0.62 + y * 0.28)
      + 0.55 * Math.cos(y * 0.77 - x * 0.19)
    );

    for (let z = 0; z <= top; z++) {
      // Pull in the bottom edge slightly, leaving a stable, flat footprint.
      if (z < 3 && d > 0.91 + z * 0.025) continue;

      const light = z > top - 3 ? 2 : y < 24 ? 1 : 0;
      const shade = Math.max(0, Math.min(3,
        light + (rand() < 0.105 ? 1 : 0) - (rand() < 0.08 ? 1 : 0)
      ));
      set(x, y, z, stone[shade]);
    }
  }
}

// Moss follows the crown and spills a little over its edges.
const patches = [
  [15, 19, 5.3, 3.5],
  [29, 17, 4.5, 3.4],
  [25, 31, 5.2, 3.5],
  [35, 27, 3.5, 4.0],
  [19, 27, 2.7, 2.3]
];

forEach((x, y, z) => {
  const exposed = !get(x, y, z + 1) || !get(x, y - 1, z)
               || !get(x - 1, y, z) || !get(x + 1, y, z);
  if (!exposed || z < 10) return;

  for (const [mx, my, rx, ry] of patches) {
    const shape = Math.pow((x - mx) / rx, 2) + Math.pow((y - my) / ry, 2);
    const ragged = 0.12 * Math.sin(x * 2.1 + y)
                 + 0.10 * Math.cos(y * 2.6 - x);
    if (shape < 1 + ragged && rand() > 0.12) {
      const topLit = !get(x, y, z + 1);
      set(x, y, z, moss[topLit ? (rand() < 0.35 ? 3 : 2)
                              : (rand() < 0.5 ? 0 : 1)]);
      break;
    }
  }
});

// Narrow, branching cracks on the viewer-facing stone.
forEach((x, y, z, color) => {
  if (!color || y > 24 || z < 3 || get(x, y - 1, z)) return;

  const leftCrack = z >= 5 && z <= 15 &&
    Math.abs(x - (17 + Math.floor((z - 5) / 3) + (z === 10 ? 1 : 0))) < 0.6;
  const leftBranch = z >= 8 && z <= 11 &&
    Math.abs(x - (14 + (z - 8))) < 0.6;
  const rightCrack = z >= 4 && z <= 12 &&
    Math.abs(x - (33 - Math.floor((z - 4) / 3))) < 0.6;

  if (leftCrack || leftBranch || rightCrack) {
    set(x, y, z, "#687775");
  }
});