tower_bridge.js

// openjscad.org
// Tower Bridge

let fancy_bricks = true;

function random_colour() {
  // based on 'BurlyWood';
  return [
    (222 + Math.random() * 10) / 255,
    (184 + Math.random() * 10) / 255,
    (135 + Math.random() * 10) / 255
  ];
}

function styled_cube(orientation) {
  let hash = {};

  if (orientation === 0) {
    hash.size = [30, 6, 2];
    hash.center = [15, 3, 1];
  } else {
    hash.size = [30, 2, 6];
    hash.center = [15, 1, 3];
  }
  if (fancy_bricks) {
    hash.radius = 0.25;
    hash.roundradius = 0.2
  }
  return cube(hash);
}

function plank(x, y, z, r) {
  return color(random_colour(), styled_cube(0)
    .rotateZ(r)
    .translate([x, y, 1 + z * 2])
  );
}

function plank2(x, y, z, r) {
  return color(random_colour(), styled_cube(1)
    .rotateZ(r)
    .translate([x, y, 1 + z * 2])
  );
}

function plank3(x, y, z, r) {
  return color(random_colour(), styled_cube(0)
    .rotateY(r)
    .translate([x, y, 1 + z * 2])
  );
}

function main() {

  var x, y, z;

  /* Base */
  var baseArr = [];
  for (z = 0; z < 12; z += 2) {
    baseArr.push(plank(-12, 0, z, 90));
    baseArr.push(plank(12, 0, z, 90));
    baseArr.push(plank(0, -12, z + 1, 0));
    baseArr.push(plank(0, 12, z + 1, 0));
  }

  let base = union(baseArr);

  /* Bridge */

  let bridgeArr = [];

  let bArr = [
    [-1, 1],
    [0, 2],
    [-1, 1, 3],
    [0, 2],
    [-1, 1, 3]
  ];

  bArr.forEach(function(arr, h) {
    arr.forEach(function(x1, _ix) {
      bridgeArr.push(plank(15 * x1, -12, h + 12, 0));
      bridgeArr.push(plank(15 * x1, 12, h + 12, 0));
    });
  });

  let bridge = union(bridgeArr);

  /* Footway */

  let footwayArr = [];

  for (x = -28; x < 60; x += 7) {
    footwayArr.push(plank(x, 0, 17, 90));
  }

  let footway = union(footwayArr);

  /* Tower */

  let towerArr = [];

  towerArr.push(plank2(0, 14, 19, 0));
  towerArr.push(plank2(0, -14, 19, 0));
  towerArr.push(plank2(0, -14, 22, 0));
  towerArr.push(plank2(0, 14, 22, 0));

  for (z = 25; z < 48; z += 6) {
    towerArr.push(plank2(-14, 0, z, 90));
    towerArr.push(plank2(14, 0, z, 90));
    towerArr.push(plank2(0, 14, z + 3, 0));
    towerArr.push(plank2(0, -14, z + 3, 0))
  }

  let tower = union(towerArr);

  /* Top Bridge */

  let topBridgeArr = [];

  let bArr2 = [
    [1],
    [2],
    [1, 3],
    [2],
    [1, 3]
  ];

  bArr2.forEach(function(arr, h) {
    arr.forEach(function(x1, _ix) {
      topBridgeArr.push(plank2(15 * x1, -12, h * 3 + 34, 0));
      topBridgeArr.push(plank2(15 * x1, 12, h * 3 + 34, 0));
    });
  });

  let topBridge = union(topBridgeArr);

  /* Footway 2 */

  let footway2Arr = [];

  for (x = -12; x < 65; x += 7) {
    footway2Arr.push(plank(x, 0, 48, 90));
  }

  let footway2 = union(footway2Arr);

  /* Tower 2 */

  let tower2Arr = [];

  for (z = 50; z < 58; z += 6) {
    tower2Arr.push(plank2(0, 14, z, 0));
    tower2Arr.push(plank2(0, -14, z, 0));
    tower2Arr.push(plank2(-14, 0, z + 3, 90));
    tower2Arr.push(plank2(14, 0, z + 3, 90));

  }

  let tower2 = union(tower2Arr);

  /* Roof */

  let roofArr = [];

  roofArr.push(plank2(-1, 0, 59, 90));
  roofArr.push(plank2(1, 0, 59, 90));

  for (x = -15; x <= 15; x += 30) {
    for (y = -12; y <= 12; y += 6) {
      roofArr.push(plank(x, y, 61, 0));
    }
  }

  for (z = 62; z < 72; z++) {
    roofArr.push(plank(0, 0, z, 90));
  }
  
  roofArr.push(plank(-29, 0, 62, 90));
  roofArr.push(plank(29, 0, 62, 90));
  roofArr.push(plank2(-25, 0, 63, 90));
  roofArr.push(plank2(25, 0, 63, 90));

  for (y = -12; y <= 12; y += 6) {
    roofArr.push(plank3(12.5, y, 67.3, 46.5));
    roofArr.push(plank3(-12.5, y, 67.3, -46.5));
  }

  roofArr.push(plank2(0, 0, 73, 90));

  let roof = union(roofArr);

  /* Make two structures, rotate one of them, slide them to the right place */

  let side1 = union([base, bridge, footway, tower, topBridge, footway2, tower2, roof]);
  let side2 = side1.rotateZ(180);

  side1 = side1.translate([-60, 0, 0]);
  side2 = side2.translate([60, 0, 0]);

  /* Connectors */

  let connectorArr = [];

  connectorArr.push(plank2(0, -12, 43, 0));
  connectorArr.push(plank2(0, 12, 43, 0));

  connectorArr.push(plank(0, -12, 15, 0));
  connectorArr.push(plank(0, 12, 15, 0));
  let connectors = union(connectorArr);

  return [side1, side2, connectors];
}