Three.js：使用鼠标旋转立方体

Question

我正在使用threejs 来渲染一个立方体。目前我实现了一个具有不同纹理的旋转立方体。现在我正在尝试使用鼠标使立方体旋转。现在就我而言，立方体正在旋转：

function animate() {
    mesh.rotation.x += .015;
    mesh.rotation.y += .015;
    mesh.rotation.y += .015;

    render();
    requestAnimationFrame( animate );
}

现在我有两个选择：

1. 我一边移动并按住鼠标一边旋转相机
2. 我在按住/移动鼠标的同时旋转立方体。

我的目标也是有两个状态。一种是立方体自动旋转，另一种是通过拖动鼠标来旋转立方体。 我已经尝试过 OrbitControler，但没有成功。是否有任何简单的解决方案，只使用鼠标让一个浮动的旋转立方体？

我的代码：

三个.JS

var camera;
var scene;
var renderer;
var mesh;
var geometry;
var material1;
var material2;
var material3;
var material4;
var material5;
var material6;
var materials;
var meshFaceMaterial;



init();
animate();

function init() {

    scene = new THREE.Scene();
    camera = new THREE.PerspectiveCamera( 30, window.innerWidth / window.innerHeight, 1, 1000);

    var light = new THREE.DirectionalLight( 0xffffff );
    light.position.set( 0, 1, 1 ).normalize();
    scene.add(light);

    geometry = new THREE.CubeGeometry( 10, 10, 10);
    material1 = new THREE.MeshPhongMaterial( { map: THREE.ImageUtils.loadTexture('img/cub1.jpg') } );
    material2 = new THREE.MeshPhongMaterial( { map: THREE.ImageUtils.loadTexture('img/cub2.jpg') } );
    material3 = new THREE.MeshPhongMaterial( { map: THREE.ImageUtils.loadTexture('img/cub3.jpg') } );
    material4 = new THREE.MeshPhongMaterial( { map: THREE.ImageUtils.loadTexture('img/cub4.jpg') } );
    material5 = new THREE.MeshPhongMaterial( { map: THREE.ImageUtils.loadTexture('img/cub5.jpg') } );
    material6 = new THREE.MeshPhongMaterial( { map: THREE.ImageUtils.loadTexture('img/cub6.jpg') } );

    materials = [material1, material3, material5, material6, material4, material2];

    meshFaceMaterial = new THREE.MeshFaceMaterial( materials );

    mesh = new THREE.Mesh(geometry, meshFaceMaterial );
    mesh.position.z = -50;
    scene.add( mesh );

    renderer = new THREE.WebGLRenderer();
    renderer.setSize( window.innerWidth, window.innerHeight );
    document.getElementById('render').appendChild( renderer.domElement );   
    window.addEventListener( 'resize', onWindowResize, false );

    render();
}

function animate() {
    mesh.rotation.x += .015;
    mesh.rotation.y += .015;
    mesh.rotation.y += .015;

    render();
    requestAnimationFrame( animate );
}

function render() {
    renderer.render( scene, camera );
}

function onWindowResize() {
    camera.aspect = window.innerWidth / window.innerHeight;
    camera.updateProjectionMatrix();
    renderer.setSize( window.innerWidth, window.innerHeight );
    render();
}

Answer 1

看代码： https://codepen.io/kranzy/pen/pEjGqV

<script src="https://dl.dropboxusercontent.com/u/3587259/Code/Threejs/three.min.js"></script>
<script src="https://dl.dropboxusercontent.com/u/3587259/Code/Threejs/OrbitControls.js"></script>

<div id="container"></div> 
<script>
var container, stats;

var camera, controls, scene, renderer;

var cross;

init();
animate();

function init() {

  camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 1000 );
  camera.position.z = 10;

  controls = new THREE.OrbitControls( camera );
  controls.addEventListener( 'change', render );

  scene = new THREE.Scene();
  // world

    geometry = new THREE.CubeGeometry( 10, 10, 10);
  /*
    material1 = new THREE.MeshPhongMaterial( { map: THREE.ImageUtils.loadTexture('img/cub1.jpg') } );
    material2 = new THREE.MeshPhongMaterial( { map: THREE.ImageUtils.loadTexture('img/cub2.jpg') } );
    material3 = new THREE.MeshPhongMaterial( { map: THREE.ImageUtils.loadTexture('img/cub3.jpg') } );
    material4 = new THREE.MeshPhongMaterial( { map: THREE.ImageUtils.loadTexture('img/cub4.jpg') } );
    material5 = new THREE.MeshPhongMaterial( { map: THREE.ImageUtils.loadTexture('img/cub5.jpg') } );
    material6 = new THREE.MeshPhongMaterial( { map: THREE.ImageUtils.loadTexture('img/cub6.jpg') } );

    materials = [material1, material3, material5, material6, material4, material2];
*/
    meshFaceMaterial = /*new THREE.MeshFaceMaterial( materials )*/ new THREE.MeshPhongMaterial({color: 0xff00ff});

    mesh = new THREE.Mesh(geometry, meshFaceMaterial );
    mesh.position.z = 0;
    scene.add( mesh );


  // lights

  light = new THREE.DirectionalLight( 0xffffff );
  light.position.set( 1, 1, 1 );
  scene.add( light );

  light = new THREE.DirectionalLight( 0x002288 );
  light.position.set( -1, -1, -1 );
  scene.add( light );

  light = new THREE.AmbientLight( 0x222222 );
  scene.add( light );


  // renderer

  renderer = new THREE.WebGLRenderer( { antialias: false } );
  renderer.setSize( window.innerWidth, window.innerHeight );

  container = document.getElementById( 'container' );
  container.appendChild( renderer.domElement );

  window.addEventListener( 'resize', onWindowResize, false );

}

function onWindowResize() {

  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();

  renderer.setSize( window.innerWidth, window.innerHeight );

  render();

}

function animate() {

  requestAnimationFrame( animate );
  controls.update();

}

function render() {
  renderer.render( scene, camera );
}
</script>

您需要将camera.position.z 设置为大于零。这就是你不能使用 OrbitControls 的原因。