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← Pirates and sea3D assetfogon/cuerdas-y-poleas

Cuerdas y poleas

by fogonCC04586 blocks
Cuerdas y poleasDrag to turn it
// «Cuerdas y poleas» · gpt-6-sol (medium)
// A ship rigging piece: a wooden post with two wooden pulleys and thick tan ropes going up and down, with a coiled rope at the foot.

const wood = "#a96532";
const woodLight = "#cf8845";
const woodDark = "#754021";
const rope = "#c99550";
const ropeLight = "#f4ce86";
const ropeDark = "#936331";

// Upright post, with a broad foot and a chunky crossbeam.
box(19, 22, 0, 29, 31, 2, woodDark);
box(21, 24, 2, 27, 29, 41, wood);
box(21, 24, 2, 21, 29, 40, woodLight);
box(27, 24, 2, 27, 29, 40, woodDark);
box(22, 24, 3, 26, 24, 40, woodLight);
box(20, 23, 39, 28, 30, 42, woodDark);
box(21, 23, 41, 27, 29, 42, woodLight);

box(9, 24, 35, 40, 28, 39, wood);
box(9, 24, 35, 40, 28, 35, woodDark);
box(9, 24, 39, 40, 28, 39, woodLight);
box(9, 24, 36, 40, 24, 38, woodLight);
box(9, 24, 35, 10, 29, 39, woodDark);
box(39, 24, 35, 40, 29, 39, woodDark);

// Little plank seams and weathered streaks.
for (const z of [10, 21, 32]) {
  box(22, 23, z, 26, 23, z, woodDark);
  box(23, 23, z + 1, 25, 23, z + 1, woodLight);
}
for (let i = 0; i < 32; i++) {
  const x = 22 + Math.floor(rand() * 5);
  const z = 4 + Math.floor(rand() * 34);
  set(x, 23, z, rand() < 0.55 ? "#dc9953" : "#925027");
}
for (const x of [14, 24, 34]) {
  box(x, 23, 36, x, 23, 38, woodDark);
  set(x, 22, 37, "#f0be61");
}

// Two projecting wooden brackets and their pulley wheels.
function pulley(cx) {
  box(cx - 2, 22, 30, cx + 2, 25, 33, woodDark);
  box(cx - 1, 22, 32, cx + 1, 25, 33, woodLight);

  for (let y = 18; y <= 22; y++) {
    for (let dx = -4; dx <= 4; dx++) {
      for (let dz = -4; dz <= 4; dz++) {
        if (dx * dx + dz * dz <= 17) {
          set(cx + dx, y, 29 + dz, y === 19 || y === 20 ? woodDark : wood);
        }
      }
    }
  }
  // Raised front rim, inset face, and a bright axle pin.
  for (let dx = -4; dx <= 4; dx++) {
    for (let dz = -4; dz <= 4; dz++) {
      const d = dx * dx + dz * dz;
      if (d <= 17 && d >= 9) set(cx + dx, 17, 29 + dz, woodDark);
      if (d < 9) set(cx + dx, 17, 29 + dz, woodLight);
    }
  }
  line(cx - 2, 16, 29, cx + 2, 16, 29, 0, wood);
  line(cx, 16, 27, cx, 16, 31, 0, wood);
  set(cx, 15, 29, "#f0bc57");
  set(cx, 15, 30, "#ffe09a");

  // A thick rope travels up one side, over the sheave, and down the other.
  const left = cx - 5, right = cx + 5;
  line(left, 16, 29, left, 16, 44, 1.25, ropeDark);
  line(left, 15, 30, left, 15, 43, 0, ropeLight);
  line(right, 16, 7, right, 16, 29, 1.25, ropeDark);
  line(right, 15, 8, right, 15, 28, 0, ropeLight);

  for (let i = 0; i < 16; i++) {
    const a = Math.PI * i / 15;
    const b = Math.PI * (i + 1) / 15;
    line(cx + 5 * Math.cos(a), 16, 29 + 5 * Math.sin(a),
         cx + 5 * Math.cos(b), 16, 29 + 5 * Math.sin(b),
         1.2, ropeDark);
    line(cx + 5 * Math.cos(a), 15, 29 + 5 * Math.sin(a),
         cx + 5 * Math.cos(b), 15, 29 + 5 * Math.sin(b),
         0, ropeLight);
  }
  for (const z of [12, 18, 24, 39]) {
    set(left, 14, z, rope);
    set(right, 14, z, rope);
  }
}
pulley(15);
pulley(34);

// Loose ends lead into a generous coil at the foot of the post.
line(20, 16, 8, 19, 16, 4, 1.2, ropeDark);
line(39, 16, 7, 33, 16, 3, 1.2, ropeDark);
line(39, 15, 7, 33, 15, 4, 0, ropeLight);

function coilRing(rx, ry, z) {
  const steps = 48;
  for (let i = 0; i < steps; i++) {
    const a = 2 * Math.PI * i / steps;
    const b = 2 * Math.PI * (i + 1) / steps;
    line(24 + rx * Math.cos(a), 16 + ry * Math.sin(a), z,
         24 + rx * Math.cos(b), 16 + ry * Math.sin(b), z,
         1.1, ropeDark);
    line(24 + rx * Math.cos(a), 16 + ry * Math.sin(a), z + 1,
         24 + rx * Math.cos(b), 16 + ry * Math.sin(b), z + 1,
         0, ropeLight);
  }
}
coilRing(7, 4, 0);
coilRing(5, 3, 2);
coilRing(3, 2, 4);
line(28, 16, 5, 32, 15, 3, 1, rope);
line(19, 16, 4, 18, 14, 2, 1, ropeLight);