javascript
/
three.js
mirror of https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
    <title>Three.js - Background CSS</title>
    <style>
    body {
        margin: 0;
    }
    #c {
        width: 100vw;
        height: 100vh;
        display: block;
    }
    </style>
  </head>
  <body>
    <canvas id="c"></canvas>
  </body>
<script src="resources/threejs/r103/three.min.js"></script>
<script>
'use strict';

/* global THREE */

function main() {
  const canvas = document.querySelector('#c');
  const renderer = new THREE.WebGLRenderer({canvas: canvas});
  renderer.autoClearColor = false;

  const fov = 75;
  const aspect = 2;  // the canvas default
  const near = 0.1;
  const far = 5;
  const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
  camera.position.z = 2;

  const scene = new THREE.Scene();

  {
    const color = 0xFFFFFF;
    const intensity = 1;
    const light = new THREE.DirectionalLight(color, intensity);
    light.position.set(-1, 2, 4);
    scene.add(light);
  }

  const boxWidth = 1;
  const boxHeight = 1;
  const boxDepth = 1;
  const geometry = new THREE.BoxGeometry(boxWidth, boxHeight, boxDepth);

  function makeInstance(geometry, color, x) {
    const material = new THREE.MeshPhongMaterial({color});

    const cube = new THREE.Mesh(geometry, material);
    scene.add(cube);

    cube.position.x = x;

    return cube;
  }

  const cubes = [
    makeInstance(geometry, 0x44aa88,  0),
    makeInstance(geometry, 0x8844aa, -2),
    makeInstance(geometry, 0xaa8844,  2),
  ];

  const bgCamera = new THREE.OrthographicCamera(
    -1, // left
     1, // right
     1, // top
    -1, // bottom
    -1, // near,
     1, // far
  );

  const bgScene = new THREE.Scene();

  const loader = new THREE.TextureLoader();
  const bgTexture = loader.load('resources/images/daikanyama.jpg');
  let bgMesh;
  {
    const plane = new THREE.PlaneBufferGeometry(2, 2);
    const material = new THREE.MeshBasicMaterial({
      map: bgTexture,
      depthTest: false,
    });
    bgMesh = new THREE.Mesh(plane, material);
    bgScene.add(bgMesh);
  }

  function resizeRendererToDisplaySize(renderer) {
    const canvas = renderer.domElement;
    const width = canvas.clientWidth;
    const height = canvas.clientHeight;
    const needResize = canvas.width !== width || canvas.height !== height;
    if (needResize) {
      renderer.setSize(width, height, false);
    }
    return needResize;
  }

  function render(time) {
    time *= 0.001;

    if (resizeRendererToDisplaySize(renderer)) {
      const canvas = renderer.domElement;
      camera.aspect = canvas.clientWidth / canvas.clientHeight;
      camera.updateProjectionMatrix();
    }

    // Scale the background plane to cover and keep the image's aspect correct.
    // Note the image may not have loaded yet.
    const canvasAspect = canvas.clientWidth / canvas.clientHeight;
    const imageAspect = bgTexture.image ? bgTexture.image.width / bgTexture.image.height : 1;
    const aspect = imageAspect / canvasAspect;
    // choose an axis to have a scale of 1 and the other >= 1
    bgMesh.scale.x = aspect > 1 ? aspect : 1;
    bgMesh.scale.y = aspect > 1 ? 1 : 1 / aspect;

    cubes.forEach((cube, ndx) => {
      const speed = 1 + ndx * .1;
      const rot = time * speed;
      cube.rotation.x = rot;
      cube.rotation.y = rot;
    });

    renderer.render(bgScene, bgCamera);
    renderer.render(scene, camera);

    requestAnimationFrame(render);
  }

  requestAnimationFrame(render);
}

main();
</script>
</html>