Three.js：同時通過觸摸和設備方向旋轉相機

Question

我正在使用threejs制作3D項目，該項目允許使用鼠標控制計算機設備的相機，還允許控制觸摸事件和智能手機的deviceorientation事件。 例如，該站點的工作方式與我想要的相同。

當我使用OrbitControls在PC版本上移動攝像頭時，我將touchstart / move / end事件綁定到mousedown / move / up上， 並且效果很好 。
問題是當我嘗試添加設備方向事件的值時。 這是我嘗試在OrbitControls.js中添加的內容：

THREE.OrbitControls = function (object, domElement) {
  const scope = this;
  let lastBeta = 0;
  let lastGamma = 0;
  this.deviceOrientation = {};

  function onDeviceOrientationChangeEvent(event) {
    scope.deviceOrientation = event;
    // Z
    var alpha = scope.deviceOrientation.alpha
      ? THREE.Math.degToRad(scope.deviceOrientation.alpha) 
      : 0;

    // X'
    var beta = scope.deviceOrientation.beta
      ? THREE.Math.degToRad(scope.deviceOrientation.beta)
      : 0;

    // Y''
    var gamma = scope.deviceOrientation.gamma 
      ? THREE.Math.degToRad(scope.deviceOrientation.gamma) 
      : 0;

    // O
    var orient = scope.screenOrientation 
      ? THREE.Math.degToRad(scope.screenOrientation) 
      : 0;

    rotateLeft(lastGamma - gamma);
    rotateUp(lastBeta - beta);

    lastBeta = beta; //is working
    lastGamma = gamma; //doesn't work properly
  }

  window.addEventListener('deviceorientation', onDeviceOrientationChangeEvent, false);
};

由於beta的值在[-180,180]度范圍內，因此垂直旋轉沒有問題，而gamma的范圍為[-90,90]，並且在上下定向設備屏幕時該值也會突然變化（即使我認為，它應該返回水平旋轉）。 即使將伽馬的范圍轉換為從-180到180的值，突然的偏移也會使所有操作出錯。

我猜想我必須在deviceOrientationControls.js中使用四元數，但是我真的不知道它是如何工作的，到目前為止，我所做的每一次嘗試都是失敗的。 有誰可以幫助我嗎？

PS：這是對deviceorientation事件的描述的鏈接，以更好地理解真正的alpha beta和gamma。

編輯
我添加了以下代碼片段以顯示beta和gamma的變化。

 let deltaBeta = 0; let deltaGamma = 0; if (window.DeviceOrientationEvent) { window.addEventListener('deviceorientation', function (e) { const beta = (e.beta != null) ? Math.round(e.beta) : 0; const gamma = (e.gamma != null) ? Math.round(e.gamma) : 0; deltaBeta = Math.abs(beta - deltaBeta); deltaGamma = Math.abs(gamma - deltaGamma); $("#beta").html("Beta: " + beta); $("#gamma").html("Gamma: " + gamma); if (Math.abs(deltaBeta) > Math.abs(Number($("#deltaBeta").html()))) { $("#deltaBeta").html(deltaBeta); if (Number($("#deltaBeta").html()) >= 30) { $("#deltaBeta").removeAttr("class", "blue").addClass("red"); } } if (Math.abs(deltaGamma) > Math.abs(Number($("#deltaGamma").html()))) { $("#deltaGamma").html(deltaGamma); if (Number($("#deltaGamma").html()) >= 30) { $("#deltaGamma").removeAttr("class", "blue").addClass("red"); } } }, true); } else { $("#gamma").html("deviceorientation not supported"); }

 .red { color: red; font-weight: bold; } .blue { color: blue; font-weight: bold; }

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <body> <div> <span id="beta"></span> <span> [-180; 180]</span> </div> <div> <span>DeltaMax</span> <span id="deltaBeta" class="blue">0</span> </div> <div> <span id="gamma"></span> <span> [-90; 90]</span> </div> <div> <span>DeltaMax</span> <span id="deltaGamma" class="blue">0</span> </div> </body>

Answer 1

我找到了使用將四元數轉換為弧度的函數的解決方案，因此如果有人想使用OrbitControls進行點擊/觸摸+設備方向控制，我想共享它。

我采用初始方向（x1，y1，z1）並計算新的方向（x2，y2，z3），它們之間的差是相機旋轉的變化。 我將這些行添加到初始更新功能

this.update = function () {
  // Z
  const alpha = scope.deviceOrientation.alpha 
    ? THREE.Math.degToRad(scope.deviceOrientation.alpha)
    : 0;

  // X'
  const beta = scope.deviceOrientation.beta
    ? THREE.Math.degToRad(scope.deviceOrientation.beta)
    : 0;

  // Y''
  const gamma = scope.deviceOrientation.gamma 
    ? THREE.Math.degToRad(scope.deviceOrientation.gamma)
    : 0;

  // O
  const orient = scope.screenOrientation
    ? THREE.Math.degToRad(scope.screenOrientation) 
    : 0;

  const currentQ = new THREE.Quaternion().copy(scope.object.quaternion);

  setObjectQuaternion(currentQ, alpha, beta, gamma, orient);
  const currentAngle = Quat2Angle(currentQ.x, currentQ.y, currentQ.z, currentQ.w);

  // currentAngle.z = left - right
  this.rotateLeft((lastGamma - currentAngle.z) / 2);
  lastGamma = currentAngle.z;

  // currentAngle.y = up - down
  this.rotateUp(lastBeta - currentAngle.y);
  lastBeta = currentAngle.y;
}

聽眾

function onDeviceOrientationChangeEvent(event) {
  scope.deviceOrientation = event;
}

window.addEventListener('deviceorientation', onDeviceOrientationChangeEvent, false);

function onScreenOrientationChangeEvent(event) {
  scope.screenOrientation = window.orientation || 0;
}

window.addEventListener('orientationchange', onScreenOrientationChangeEvent, false);

功能

var setObjectQuaternion = function () {
  const zee = new THREE.Vector3(0, 0, 1);
  const euler = new THREE.Euler();
  const q0 = new THREE.Quaternion();
  const q1 = new THREE.Quaternion(-Math.sqrt(0.5), 0, 0,  Math.sqrt(0.5));

  return function (quaternion, alpha, beta, gamma, orient) {
    // 'ZXY' for the device, but 'YXZ' for us
    euler.set(beta, alpha, -gamma, 'YXZ');

    // Orient the device
    quaternion.setFromEuler(euler);

    // camera looks out the back of the device, not the top
    quaternion.multiply(q1);

    // adjust for screen orientation
    quaternion.multiply(q0.setFromAxisAngle(zee, -orient));
  }
} ();

function Quat2Angle(x, y, z, w) {
  let pitch, roll, yaw;

  const test = x * y + z * w;
  // singularity at north pole
  if (test > 0.499) {
    yaw = Math.atan2(x, w) * 2;
    pitch = Math.PI / 2;
    roll = 0;

    return new THREE.Vector3(pitch, roll, yaw);
  }

  // singularity at south pole
  if (test < -0.499) {
    yaw = -2 * Math.atan2(x, w);
    pitch = -Math.PI / 2;
    roll = 0;
    return new THREE.Vector3(pitch, roll, yaw);
  }

  const sqx = x * x;
  const sqy = y * y;
  const sqz = z * z;

  yaw = Math.atan2((2 * y * w) - (2 * x * z), 1 - (2 * sqy) - (2 * sqz));
  pitch = Math.asin(2 * test);
  roll = Math.atan2((2 * x * w) - (2 * y * z), 1 - (2 * sqx) - (2 * sqz));

  return new THREE.Vector3(pitch, roll, yaw);
}

Three.js：同時通過觸摸和設備方向旋轉相機

問題描述

1 個解決方案

解決方案1
9 已采納 2016-02-17 05:54:53

聽眾

功能

Three.js：同時通過觸摸和設備方向旋轉相機

問題描述

1 個解決方案

解決方案1 9 已采納 2016-02-17 05:54:53

聽眾

功能

解決方案1
9 已采納 2016-02-17 05:54:53