Cesium API - Transforms 中文文档

内置方法

示例：

// 将点从ICRF轴转换为固定轴。
var now = Cesium.JulianDate.now();
var pointInFixed = Cesium.Cartesian3.fromDegrees(0.0, 0.0);
var fixedToIcrf = Cesium.Transforms.computeIcrfToFixedMatrix(now);
var pointInInertial = new Cesium.Cartesian3();
if (Cesium.defined(fixedToIcrf)) {
    pointInInertial = Cesium.Matrix3.multiplyByVector(fixedToIcrf, pointInFixed, pointInInertial);
}

参考：

• Transforms.preloadIcrfFixed

示例：

scene.postUpdate.addEventListener(function(scene, time) {
  // View in ICRF.
  var icrfToFixed = Cesium.Transforms.computeIcrfToFixedMatrix(time);
  if (Cesium.defined(icrfToFixed)) {
    var offset = Cesium.Cartesian3.clone(camera.position);
    var transform = Cesium.Matrix4.fromRotationTranslation(icrfToFixed);
    camera.lookAtTransform(transform, offset);
  }
});

参考：

• Transforms.preloadIcrfFixed

示例：

// 将视图设置为惯性系。
scene.postUpdate.addEventListener(function(scene, time) {
   var now = Cesium.JulianDate.now();
   var offset = Cesium.Matrix4.multiplyByPoint(camera.transform, camera.position, new Cesium.Cartesian3());
   var transform = Cesium.Matrix4.fromRotationTranslation(Cesium.Transforms.computeTemeToPseudoFixedMatrix(now));
   var inverseTransform = Cesium.Matrix4.inverseTransformation(transform, new Cesium.Matrix4());
   Cesium.Matrix4.multiplyByPoint(inverseTransform, offset, offset);
   camera.lookAtTransform(transform, offset);
});

示例：

// Get the transform from local east-north-up at cartographic (0.0, 0.0) to Earth's fixed frame.
var center = Cesium.Cartesian3.fromDegrees(0.0, 0.0);
var transform = Cesium.Transforms.eastNorthUpToFixedFrame(center);

示例：

// 在地图上(0.0,0.0)从当地的heading-pitch-roll a到地固系（Earth's fixed frame）获得四元数。
var center = Cesium.Cartesian3.fromDegrees(0.0, 0.0);
var heading = -Cesium.Math.PI_OVER_TWO;
var pitch = Cesium.Math.PI_OVER_FOUR;
var roll = 0.0;
var hpr = new HeadingPitchRoll(heading, pitch, roll);
var quaternion = Cesium.Transforms.headingPitchRollQuaternion(center, hpr);

示例：

// 获取从地图(0.0,0.0)的本地 heading-pitch-roll 到地固系的转换。
var center = Cesium.Cartesian3.fromDegrees(0.0, 0.0);
var heading = -Cesium.Math.PI_OVER_TWO;
var pitch = Cesium.Math.PI_OVER_FOUR;
var roll = 0.0;
var hpr = new Cesium.HeadingPitchRoll(heading, pitch, roll);
var transform = Cesium.Transforms.headingPitchRollToFixedFrame(center, hpr);

示例：

// 从当地东北向下方向的地图(0.0,0.0)转换到地固系。
var center = Cesium.Cartesian3.fromDegrees(0.0, 0.0);
var transform = Cesium.Transforms.northEastDownToFixedFrame(center);

示例：

// 在地图(0.0,0.0)获取从当地north-up-east到地固系（Earth's fixed frame）的变换。
var center = Cesium.Cartesian3.fromDegrees(0.0, 0.0);
var transform = Cesium.Transforms.northUpEastToFixedFrame(center);