Transforms

Members

See:

• Transforms.computeIcrfToFixedMatrix
• Transforms.computeFixedToIcrfMatrix

Methods

Returns:

Example:

// Transform a point from the Fixed axes to the ICRF axes.
const now = Cesium.JulianDate.now();
const pointInFixed = Cesium.Cartesian3.fromDegrees(0.0, 0.0);
const fixedToIcrf = Cesium.Transforms.computeFixedToIcrfMatrix(now);
let pointInInertial = new Cesium.Cartesian3();
if (Cesium.defined(fixedToIcrf)) {
    pointInInertial = Cesium.Matrix3.multiplyByVector(fixedToIcrf, pointInFixed, pointInInertial);
}

See:

• Transforms.preloadIcrfFixed

Returns:

Example:

// Set the default ICRF to fixed transformation to that of the Moon.
Cesium.Transforms.computeIcrfToCentralBodyFixedMatrix = Cesium.Transforms.computeIcrfToMoonFixedMatrix;

See:

• Transforms.computeIcrfToFixedMatrix
• Transforms.computeTemeToPseudoFixedMatrix
• Transforms.computeIcrfToMoonFixedMatrix

Returns:

Example:

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

See:

• Transforms.preloadIcrfFixed

Returns:

Example:

// Set the default ICRF to fixed transformation to that of the Moon.
Cesium.Transforms.computeIcrfToCentralBodyFixedMatrix = Cesium.Transforms.computeIcrfToMoonFixedMatrix;

Returns:

Example:

// Transform a point from the Fixed axes to the ICRF axes.
const now = Cesium.JulianDate.now();
const pointInFixed = Cesium.Cartesian3.fromDegrees(0.0, 0.0);
const fixedToIcrf = Cesium.Transforms.computeMoonFixedToIcrfMatrix(now);
let pointInInertial = new Cesium.Cartesian3();
if (Cesium.defined(fixedToIcrf)) {
    pointInInertial = Cesium.Matrix3.multiplyByVector(fixedToIcrf, pointInFixed, pointInInertial);
}

Returns:

Example:

//Set the view to the inertial frame.
scene.postUpdate.addEventListener(function(scene, time) {
   const now = Cesium.JulianDate.now();
   const offset = Cesium.Matrix4.multiplyByPoint(camera.transform, camera.position, new Cesium.Cartesian3());
   const transform = Cesium.Matrix4.fromRotationTranslation(Cesium.Transforms.computeTemeToPseudoFixedMatrix(now));
   const inverseTransform = Cesium.Matrix4.inverseTransformation(transform, new Cesium.Matrix4());
   Cesium.Matrix4.multiplyByPoint(inverseTransform, offset, offset);
   camera.lookAtTransform(transform, offset);
});

Returns:

Example:

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

Returns:

Returns:

Throws:

• DeveloperError : referenceEntity and targetEntity positions must be defined.

Example:

const referenceSatellite = viewer.entities.getById('satellite1');
const targetSatellite = viewer.entities.getById('satellite2');
const computedPosition = Transforms.getPositionInVVLH(referenceSatellite, targetSatellite, Cesium.JulianDate.now(), Cesium.JulianDate.now());
console.log(computedPosition);

Returns:

Example:

const transformToFixedFrame = Transforms.getTransformToFixedFrame(referenceFrame, currentTime, positionProperty);
const fixedFrameMatrix = transformToFixedFrame(origin, ellipsoid, result);

Returns:

Example:

// Get the quaternion from local heading-pitch-roll at cartographic (0.0, 0.0) to Earth's fixed frame.
const center = Cesium.Cartesian3.fromDegrees(0.0, 0.0);
const heading = -Cesium.Math.PI_OVER_TWO;
const pitch = Cesium.Math.PI_OVER_FOUR;
const roll = 0.0;
const hpr = new HeadingPitchRoll(heading, pitch, roll);
const quaternion = Cesium.Transforms.headingPitchRollQuaternion(center, hpr);

Returns:

Example:

// Get the transform from local heading-pitch-roll at cartographic (0.0, 0.0) to Earth's fixed frame.
const center = Cesium.Cartesian3.fromDegrees(0.0, 0.0);
const heading = -Cesium.Math.PI_OVER_TWO;
const pitch = Cesium.Math.PI_OVER_FOUR;
const roll = 0.0;
const hpr = new Cesium.HeadingPitchRoll(heading, pitch, roll);
const transform = Cesium.Transforms.headingPitchRollToFixedFrame(center, hpr);

Returns:

Returns:

Example:

// Get the quaternion representing orientation in Earth's fixed frame from a local quaternion at cartographic (0.0, 0.0).
const origin = Cesium.Cartesian3.fromDegrees(0.0, 0.0);
const localQuaternion = Cesium.Quaternion.fromAxisAngle(Cesium.Cartesian3.UNIT_Z, Cesium.Math.toRadians(45));
const fixedFrameQuaternion = Cesium.Transforms.localToFixedFrameQuaternion(origin, localQuaternion);

Returns:

Returns:

Example:

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

Returns:

Example:

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

Returns:

Example:

// Get the transform from local north-West-Up at cartographic (0.0, 0.0) to Earth's fixed frame.
const center = Cesium.Cartesian3.fromDegrees(0.0, 0.0);
const transform = Cesium.Transforms.northWestUpToFixedFrame(center);

Returns:

Returns:

Example:

const interval = new Cesium.TimeInterval(...);
await Cesium.Transforms.preloadIcrfFixed(interval));
// the data is now loaded

See:

• Transforms.computeIcrfToFixedMatrix
• Transforms.computeFixedToIcrfMatrix

Returns:

Returns:

Returns:

Example:

const fixedTransform = Transforms.vvlhToFixed(positionProperty, currentTime);

Type Definitions

Returns: