Crossy Road with three.js

Open In Editor Video Publish Your Code

@media (min-height: 425px) {
  /** Youtube logo by https://codepen.io/alvaromontoro */
  #youtube {
    z-index: 50;
    width: 100px;
    display: block;
    height: 70px;
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: red;
    border-radius: 50% / 11%;
    transform: scale(0.8);
    transition: transform 0.5s;
  }

#youtube:hover,
  #youtube:focus {
    transform: scale(0.9);
    color: black;
  }

#youtube::before {
    content: "";
    display: block;
    position: absolute;
    top: 7.5%;
    left: -6%;
    width: 112%;
    height: 85%;
    background: red;
    border-radius: 9% / 50%;
  }

#youtube::after {
    content: "";
    display: block;
    position: absolute;
    top: 20px;
    left: 40px;
    width: 45px;
    height: 30px;
    border: 15px solid transparent;
    box-sizing: border-box;
    border-left: 30px solid white;
  }

#youtube span {
    font-size: 0;
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
  }

#youtube:hover + #youtube-card {
    z-index: 49;
    display: block;
    position: fixed;
    bottom: 12px;
    right: 10px;
    padding: 25px 130px 25px 25px;
    width: 300px;
    background-color: white;
  }
}

JS

import * as THREE from "https://esm.sh/three";

const minTileIndex = -8;
const maxTileIndex = 8;
const tilesPerRow = maxTileIndex - minTileIndex + 1;
const tileSize = 42;

function Camera() {
  const size = 300;
  const viewRatio = window.innerWidth / window.innerHeight;
  const width = viewRatio < 1 ? size : size * viewRatio;
  const height = viewRatio < 1 ? size / viewRatio : size;

const camera = new THREE.OrthographicCamera(
    width / -2, // left
    width / 2, // right
    height / 2, // top
    height / -2, // bottom
    100, // near
    900 // far
  );

camera.up.set(0, 0, 1);
  camera.position.set(300, -300, 300);
  camera.lookAt(0, 0, 0);

return camera;
}

function Texture(width, height, rects) {
  const canvas = document.createElement("canvas");
  canvas.width = width;
  canvas.height = height;
  const context = canvas.getContext("2d");
  context.fillStyle = "#ffffff";
  context.fillRect(0, 0, width, height);
  context.fillStyle = "rgba(0,0,0,0.6)";
  rects.forEach((rect) => {
    context.fillRect(rect.x, rect.y, rect.w, rect.h);
  });
  return new THREE.CanvasTexture(canvas);
}

export const truckFrontTexture = Texture(30, 30, [
  { x: 5, y: 0, w: 10, h: 30 },
]);
export const truckRightSideTexture = Texture(25, 30, [
  { x: 15, y: 5, w: 10, h: 10 },
]);
export const truckLeftSideTexture = Texture(25, 30, [
  { x: 15, y: 15, w: 10, h: 10 },
]);

function Car(initialTileIndex, direction, color) {
  const car = new THREE.Group();
  car.position.x = initialTileIndex * tileSize;
  if (!direction) car.rotation.z = Math.PI;

const main = new THREE.Mesh(
    new THREE.BoxGeometry(60, 30, 15),
    new THREE.MeshLambertMaterial({ color, flatShading: true })
  );
  main.position.z = 12;
  main.castShadow = true;
  main.receiveShadow = true;
  car.add(main);

const frontWheel = Wheel(18);
  car.add(frontWheel);

const backWheel = Wheel(-18);
  car.add(backWheel);

return car;
}

function DirectionalLight() {
  const dirLight = new THREE.DirectionalLight();
  dirLight.position.set(-100, -100, 200);
  dirLight.up.set(0, 0, 1);
  dirLight.castShadow = true;

dirLight.shadow.mapSize.width = 2048;
  dirLight.shadow.mapSize.height = 2048;

dirLight.shadow.camera.up.set(0, 0, 1);
  dirLight.shadow.camera.left = -400;
  dirLight.shadow.camera.right = 400;
  dirLight.shadow.camera.top = 400;
  dirLight.shadow.camera.bottom = -400;
  dirLight.shadow.camera.near = 50;
  dirLight.shadow.camera.far = 400;

return dirLight;
}

function Grass(rowIndex) {
  const grass = new THREE.Group();
  grass.position.y = rowIndex * tileSize;

const createSection = (color) =>
    new THREE.Mesh(
      new THREE.BoxGeometry(tilesPerRow * tileSize, tileSize, 3),
      new THREE.MeshLambertMaterial({ color })
    );

const middle = createSection(0xbaf455);
  middle.receiveShadow = true;
  grass.add(middle);

const left = createSection(0x99c846);
  left.position.x = -tilesPerRow * tileSize;
  grass.add(left);

const right = createSection(0x99c846);
  right.position.x = tilesPerRow * tileSize;
  grass.add(right);

return grass;
}

const metadata = [];

const map = new THREE.Group();

function initializeMap() {
  // Remove all rows
  metadata.length = 0;
  map.remove(...map.children);

// Add new rows
  for (let rowIndex = 0; rowIndex > -10; rowIndex--) {
    const grass = Grass(rowIndex);
    map.add(grass);
  }
  addRows();
}

function addRows() {
  const newMetadata = generateRows(20);

const startIndex = metadata.length;
  metadata.push(...newMetadata);

newMetadata.forEach((rowData, index) => {
    const rowIndex = startIndex + index + 1;

if (rowData.type === "forest") {
      const row = Grass(rowIndex);

rowData.trees.forEach(({ tileIndex, height }) => {
        const three = Tree(tileIndex, height);
        row.add(three);
      });

map.add(row);
    }

if (rowData.type === "car") {
      const row = Road(rowIndex);

rowData.vehicles.forEach((vehicle) => {
        const car = Car(
          vehicle.initialTileIndex,
          rowData.direction,
          vehicle.color
        );
        vehicle.ref = car;
        row.add(car);
      });

map.add(row);
    }

if (rowData.type === "truck") {
      const row = Road(rowIndex);

rowData.vehicles.forEach((vehicle) => {
        const truck = Truck(
          vehicle.initialTileIndex,
          rowData.direction,
          vehicle.color
        );
        vehicle.ref = truck;
        row.add(truck);
      });

map.add(row);
    }
  });
}

const player = Player();

function Player() {
  const player = new THREE.Group();

const body = new THREE.Mesh(
    new THREE.BoxGeometry(15, 15, 20),
    new THREE.MeshLambertMaterial({
      color: "white",
      flatShading: true,
    })
  );
  body.position.z = 10;
  body.castShadow = true;
  body.receiveShadow = true;
  player.add(body);

const cap = new THREE.Mesh(
    new THREE.BoxGeometry(2, 4, 2),
    new THREE.MeshLambertMaterial({
      color: 0xf0619a,
      flatShading: true,
    })
  );
  cap.position.z = 21;
  cap.castShadow = true;
  cap.receiveShadow = true;
  player.add(cap);

const playerContainer = new THREE.Group();
  playerContainer.add(player);

return playerContainer;
}

const position = {
  currentRow: 0,
  currentTile: 0,
};

const movesQueue = [];

function initializePlayer() {
  // Initialize the Three.js player object
  player.position.x = 0;
  player.position.y = 0;
  player.children[0].position.z = 0;

// Initialize metadata
  position.currentRow = 0;
  position.currentTile = 0;

// Clear the moves queue
  movesQueue.length = 0;
}

function queueMove(direction) {
  const isValidMove = endsUpInValidPosition(
    {
      rowIndex: position.currentRow,
      tileIndex: position.currentTile,
    },
    [...movesQueue, direction]
  );

if (!isValidMove) return;

movesQueue.push(direction);
}

function stepCompleted() {
  const direction = movesQueue.shift();

if (direction === "forward") position.currentRow += 1;
  if (direction === "backward") position.currentRow -= 1;
  if (direction === "left") position.currentTile -= 1;
  if (direction === "right") position.currentTile += 1;

// Add new rows if the player is running out of them
  if (position.currentRow > metadata.length - 10) addRows();

const scoreDOM = document.getElementById("score");
  if (scoreDOM) scoreDOM.innerText = position.currentRow.toString();
}

function Renderer() {
  const canvas = document.querySelector("canvas.game");
  if (!canvas) throw new Error("Canvas not found");

const renderer = new THREE.WebGLRenderer({
    alpha: true,
    antialias: true,
    canvas: canvas,
  });
  renderer.setPixelRatio(window.devicePixelRatio);
  renderer.setSize(window.innerWidth, window.innerHeight);
  renderer.shadowMap.enabled = true;

return renderer;
}

function Road(rowIndex) {
  const road = new THREE.Group();
  road.position.y = rowIndex * tileSize;

const createSection = (color) =>
    new THREE.Mesh(
      new THREE.PlaneGeometry(tilesPerRow * tileSize, tileSize),
      new THREE.MeshLambertMaterial({ color })
    );

const middle = createSection(0x454a59);
  middle.receiveShadow = true;
  road.add(middle);

const left = createSection(0x393d49);
  left.position.x = -tilesPerRow * tileSize;
  road.add(left);

const right = createSection(0x393d49);
  right.position.x = tilesPerRow * tileSize;
  road.add(right);

return road;
}

function Tree(tileIndex, height) {
  const tree = new THREE.Group();
  tree.position.x = tileIndex * tileSize;

const trunk = new THREE.Mesh(
    new THREE.BoxGeometry(15, 15, 20),
    new THREE.MeshLambertMaterial({
      color: 0x4d2926,
      flatShading: true,
    })
  );
  trunk.position.z = 10;
  tree.add(trunk);

const crown = new THREE.Mesh(
    new THREE.BoxGeometry(30, 30, height),
    new THREE.MeshLambertMaterial({
      color: 0x7aa21d,
      flatShading: true,
    })
  );
  crown.position.z = height / 2 + 20;
  crown.castShadow = true;
  crown.receiveShadow = true;
  tree.add(crown);

return tree;
}

function Truck(initialTileIndex, direction, color) {
  const truck = new THREE.Group();
  truck.position.x = initialTileIndex * tileSize;
  if (!direction) truck.rotation.z = Math.PI;

const cargo = new THREE.Mesh(
    new THREE.BoxGeometry(70, 35, 35),
    new THREE.MeshLambertMaterial({
      color: 0xb4c6fc,
      flatShading: true,
    })
  );
  cargo.position.x = -15;
  cargo.position.z = 25;
  cargo.castShadow = true;
  cargo.receiveShadow = true;
  truck.add(cargo);

truck.add(cabin);

const frontWheel = Wheel(37);
  truck.add(frontWheel);

const middleWheel = Wheel(5);
  truck.add(middleWheel);

const backWheel = Wheel(-35);
  truck.add(backWheel);

return truck;
}

function Wheel(x) {
  const wheel = new THREE.Mesh(
    new THREE.BoxGeometry(12, 33, 12),
    new THREE.MeshLambertMaterial({
      color: 0x333333,
      flatShading: true,
    })
  );
  wheel.position.x = x;
  wheel.position.z = 6;
  return wheel;
}

function endsUpInValidPosition(currentPosition, moves) {
  // Calculate where the player would end up after the move
  const finalPosition = calculateFinalPosition(currentPosition, moves);

// Detect if we hit the edge of the board
  if (
    finalPosition.rowIndex === -1 ||
    finalPosition.tileIndex === minTileIndex - 1 ||
    finalPosition.tileIndex === maxTileIndex + 1
  ) {
    // Invalid move, ignore move command
    return false;
  }

// Detect if we hit a tree
  const finalRow = metadata[finalPosition.rowIndex - 1];
  if (
    finalRow &&
    finalRow.type === "forest" &&
    finalRow.trees.some((tree) => tree.tileIndex === finalPosition.tileIndex)
  ) {
    // Invalid move, ignore move command
    return false;
  }

return true;
}

function generateRows(amount) {
  const rows = [];
  for (let i = 0; i < amount; i++) {
    const rowData = generateRow();
    rows.push(rowData);
  }
  return rows;
}

function generateRow() {
  const type = randomElement(["car", "truck", "forest"]);
  if (type === "car") return generateCarLaneMetadata();
  if (type === "truck") return generateTruckLaneMetadata();
  return generateForesMetadata();
}

function randomElement(array) {
  return array[Math.floor(Math.random() * array.length)];
}

function generateForesMetadata() {
  const occupiedTiles = new Set();
  const trees = Array.from({ length: 4 }, () => {
    let tileIndex;
    do {
      tileIndex = THREE.MathUtils.randInt(minTileIndex, maxTileIndex);
    } while (occupiedTiles.has(tileIndex));
    occupiedTiles.add(tileIndex);

const height = randomElement([20, 45, 60]);

return { tileIndex, height };
  });

return { type: "forest", trees };
}

function generateCarLaneMetadata() {
  const direction = randomElement([true, false]);
  const speed = randomElement([125, 156, 188]);

const occupiedTiles = new Set();

const vehicles = Array.from({ length: 3 }, () => {
    let initialTileIndex;
    do {
      initialTileIndex = THREE.MathUtils.randInt(minTileIndex, maxTileIndex);
    } while (occupiedTiles.has(initialTileIndex));
    occupiedTiles.add(initialTileIndex - 1);
    occupiedTiles.add(initialTileIndex);
    occupiedTiles.add(initialTileIndex + 1);

const color = randomElement([0xa52523, 0xbdb638, 0x78b14b]);

return { initialTileIndex, color };
  });

return { type: "car", direction, speed, vehicles };
}

function generateTruckLaneMetadata() {
  const direction = randomElement([true, false]);
  const speed = randomElement([125, 156, 188]);

const occupiedTiles = new Set();

const vehicles = Array.from({ length: 2 }, () => {
    let initialTileIndex;
    do {
      initialTileIndex = THREE.MathUtils.randInt(minTileIndex, maxTileIndex);
    } while (occupiedTiles.has(initialTileIndex));
    occupiedTiles.add(initialTileIndex - 2);
    occupiedTiles.add(initialTileIndex - 1);
    occupiedTiles.add(initialTileIndex);
    occupiedTiles.add(initialTileIndex + 1);
    occupiedTiles.add(initialTileIndex + 2);

const color = randomElement([0xa52523, 0xbdb638, 0x78b14b]);

return { initialTileIndex, color };
  });

return { type: "truck", direction, speed, vehicles };
}

const moveClock = new THREE.Clock(false);

function animatePlayer() {
  if (!movesQueue.length) return;

if (!moveClock.running) moveClock.start();

const stepTime = 0.2; // Seconds it takes to take a step
  const progress = Math.min(1, moveClock.getElapsedTime() / stepTime);

setPosition(progress);
  setRotation(progress);

// Once a step has ended
  if (progress >= 1) {
    stepCompleted();
    moveClock.stop();
  }
}

function setPosition(progress) {
  const startX = position.currentTile * tileSize;
  const startY = position.currentRow * tileSize;
  let endX = startX;
  let endY = startY;

if (movesQueue[0] === "left") endX -= tileSize;
  if (movesQueue[0] === "right") endX += tileSize;
  if (movesQueue[0] === "forward") endY += tileSize;
  if (movesQueue[0] === "backward") endY -= tileSize;

player.position.x = THREE.MathUtils.lerp(startX, endX, progress);
  player.position.y = THREE.MathUtils.lerp(startY, endY, progress);
  player.children[0].position.z = Math.sin(progress * Math.PI) * 8;
}

function setRotation(progress) {
  let endRotation = 0;
  if (movesQueue[0] == "forward") endRotation = 0;
  if (movesQueue[0] == "left") endRotation = Math.PI / 2;
  if (movesQueue[0] == "right") endRotation = -Math.PI / 2;
  if (movesQueue[0] == "backward") endRotation = Math.PI;

player.children[0].rotation.z = THREE.MathUtils.lerp(
    player.children[0].rotation.z,
    endRotation,
    progress
  );
}

const clock = new THREE.Clock();

function animateVehicles() {
  const delta = clock.getDelta();

// Animate cars and trucks
  metadata.forEach((rowData) => {
    if (rowData.type === "car" || rowData.type === "truck") {
      const beginningOfRow = (minTileIndex - 2) * tileSize;
      const endOfRow = (maxTileIndex + 2) * tileSize;

rowData.vehicles.forEach(({ ref }) => {
        if (!ref) throw Error("Vehicle reference is missing");

if (rowData.direction) {
          ref.position.x =
            ref.position.x > endOfRow
              ? beginningOfRow
              : ref.position.x + rowData.speed * delta;
        } else {
          ref.position.x =
            ref.position.x < beginningOfRow
              ? endOfRow
              : ref.position.x - rowData.speed * delta;
        }
      });
    }
  });
}

document
  .getElementById("forward")
  ?.addEventListener("click", () => queueMove("forward"));

document
  .getElementById("backward")
  ?.addEventListener("click", () => queueMove("backward"));

document
  .getElementById("left")
  ?.addEventListener("click", () => queueMove("left"));

document
  .getElementById("right")
  ?.addEventListener("click", () => queueMove("right"));

function hitTest() {
  const row = metadata[position.currentRow - 1];
  if (!row) return;

if (row.type === "car" || row.type === "truck") {
    const playerBoundingBox = new THREE.Box3();
    playerBoundingBox.setFromObject(player);

row.vehicles.forEach(({ ref }) => {
      if (!ref) throw Error("Vehicle reference is missing");

const vehicleBoundingBox = new THREE.Box3();
      vehicleBoundingBox.setFromObject(ref);

if (playerBoundingBox.intersectsBox(vehicleBoundingBox)) {
        if (!resultDOM || !finalScoreDOM) return;
        resultDOM.style.visibility = "visible";
        finalScoreDOM.innerText = position.currentRow.toString();
      }
    });
  }
}

const scene = new THREE.Scene();
scene.add(player);
scene.add(map);

const ambientLight = new THREE.AmbientLight();
scene.add(ambientLight);

const dirLight = DirectionalLight();
dirLight.target = player;
player.add(dirLight);

const camera = Camera();
player.add(camera);

const scoreDOM = document.getElementById("score");
const resultDOM = document.getElementById("result-container");
const finalScoreDOM = document.getElementById("final-score");

initializeGame();

document.querySelector("#retry")?.addEventListener("click", initializeGame);

function initializeGame() {
  initializePlayer();
  initializeMap();

// Initialize UI
  if (scoreDOM) scoreDOM.innerText = "0";
  if (resultDOM) resultDOM.style.visibility = "hidden";
}

const renderer = Renderer();
renderer.setAnimationLoop(animate);

function animate() {
  animateVehicles();
  animatePlayer();
  hitTest();

renderer.render(scene, camera);
}

Crossy Road with three.js

Recommended

HTML Login Form with Password Toggle

Add button to open add profile model with form validation

Fireworks with mouse

HTML

CSS

JS

Recommended

HTML Login Form with Password Toggle

Add button to open add profile model with form validation

Fireworks with mouse

HTMLCopy

CSSCopy

JSCopy

HTML

CSS

JS