使用设备的方向绕原点旋转 [英] Orbiting around the origin using a device's orientation

问题描述

我试图用three.js复制Google的Cardboard DemoExhibit的功能。我直接从 Chrome实验网页中获取了起始示例，并在代码中删除了一个简单的三角形金字塔在 init 方法中：

I am trying to replicate the functionality of Google's Cardboard Demo "Exhibit" with three.js. I took the starting example straight from the Chrome Experiments web page and just dropped in code to draw a simple triangular pyramid in the init method:

function init() {
  renderer = new THREE.WebGLRenderer();
  element = renderer.domElement;
  container = document.getElementById('example');
  container.appendChild(element);

  effect = new THREE.StereoEffect(renderer);

  scene = new THREE.Scene();

  camera = new THREE.PerspectiveCamera(90, 1, 0.001, 700);
  camera.position.set(0, 0, 50);
  scene.add(camera);

  controls = new THREE.OrbitControls(camera, element);
  controls.rotateUp(Math.PI / 4);
  controls.noZoom = true;
  controls.noPan = true;

  var geometry = new THREE.CylinderGeometry( 0, 10, 30, 4, 1 );
  var material = new THREE.MeshPhongMaterial( { color:0xffffff, shading: THREE.FlatShading } );

  var mesh = new THREE.Mesh( geometry, material );
  mesh.updateMatrix();
  mesh.matrixAutoUpdate = false;
  scene.add( mesh );

  var 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 );

  function setOrientationControls(e) {
    if (!e.alpha) {
      return;
    }

    controls = new THREE.DeviceOrientationControls(camera);
    controls.connect();
    controls.update();

    element.addEventListener('click', fullscreen, false);

    window.removeEventListener('deviceorientation', setOrientationControls, true);
  }
  window.addEventListener('deviceorientation', setOrientationControls, true);

  window.addEventListener('resize', resize, false);
  setTimeout(resize, 1);
}

OrbitControls 方法在桌面上工作完美：通过鼠标拖动，屏幕围绕金字塔旋转。在移动设备上使用 DeviceOrientationControls 然而，此效果完全丢失，而相机在（0,0,0）处自由移动。我尝试将之前的问题建议并替换相机带场景这样：

The OrbitControls method on desktop works perfectly: by dragging with the mouse, the screen orbits around the pyramid. On mobile using DeviceOrientationControls however, this effect is entirely lost and instead the camera moves freely at (0, 0, 0). I tried doing as a previous question suggested and replacing the camera with scene such that:

controls = new THREE.DeviceOrientationControls(scene);

然而这根本不起作用，旋转设备时没有任何动作。我需要更改为使用 DeviceOrientationControls ？

however this does not work at all and nothing moves when the device is rotated. What do I need to change to replicate OrbitControls behavior with the motion captured by DeviceOrientationControls?

推荐答案

要创建一个设备定位轨道控制器，就像在本演示中看到的那样， http://novak.us/labs/UmDemo/ ;它涉及修改现有的OrbitControls.js。

To create a deviceorientation orbit controler, like you see on this demo, http://novak.us/labs/UmDemo/; It involves modifying the existing OrbitControls.js.

文件更改可以在github上的这个提交中看到： https://github.com/snovak/three.js/commit/f6542ab3d95b1c746ab4d39ab5d3253720830dd3

The file changes can be seen in this commit on github: https://github.com/snovak/three.js/commit/f6542ab3d95b1c746ab4d39ab5d3253720830dd3

我一直想做几个月的拉取请求。只是没有得到它。需要一堆清理。

I've been meaning to do a pull request for months. Just haven't gotten around to it. Needs a bunch of clean up.

你可以在这里下载我修改过的OrbitControls.js（我还没有在几个月内合并，结果可能会有所不同）：https://raw.githubusercontent.com/snovak/three.js/master/examples/ js / controls / OrbitControls.js

You can download my modified OrbitControls.js here (I haven't merged in months either, results may vary): https://raw.githubusercontent.com/snovak/three.js/master/examples/js/controls/OrbitControls.js

以下是如何在自己的脚本中实现修改后的OrbitControls：

Below is how you would implement the modified OrbitControls in your own scripts:

this.controls = new THREE.OrbitControls( camera, document.getElementById('screen') ) ;

            controls.tiltEnabled = true ;  // default is false.  You need to turn this on to control with the gyro sensor.

            controls.minPolarAngle = Math.PI * 0.4; // radians
            controls.maxPolarAngle = Math.PI * 0.6; // radians
            controls.noZoom = true ;

            // How far you can rotate on the horizontal axis, upper and lower limits.
            // If set, must be a sub-interval of the interval [ - Math.PI, Math.PI ].
            controls.minAzimuthAngle = - Math.PI * 0.1; // radians
            controls.maxAzimuthAngle = Math.PI * 0.1; // radians

            this.UMLogo = scene.children[1];
            controls.target = UMLogo.position;

我希望能让你成为你想去的地方！ ： - ）

I hope that gets you where you want to be! :-)

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