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Quaternion

new Cesium.Quaternion(x, y, z, w)
engine/Source/Core/Quaternion.js 21

A set of 4-dimensional coordinates used to represent rotation in 3-dimensional space.
Name Type Default Description
x number 0.0 optional The X component.
y number 0.0 optional The Y component.
z number 0.0 optional The Z component.
w number 0.0 optional The W component.
See:

Members

static constant Cesium.Quaternion.IDENTITY : Quaternion
engine/Source/Core/Quaternion.js 1102

An immutable Quaternion instance initialized to (0.0, 0.0, 0.0, 1.0).

static Cesium.Quaternion.packedInterpolationLength : number
engine/Source/Core/Quaternion.js 281

The number of elements used to store the object into an array in its interpolatable form.

static Cesium.Quaternion.packedLength : number
engine/Source/Core/Quaternion.js 225

The number of elements used to pack the object into an array.

static constant Cesium.Quaternion.ZERO : Quaternion
engine/Source/Core/Quaternion.js 1094

An immutable Quaternion instance initialized to (0.0, 0.0, 0.0, 0.0).

w : number
engine/Source/Core/Quaternion.js 48

The W component.
Default Value: 0.0

x : number
engine/Source/Core/Quaternion.js 27

The X component.
Default Value: 0.0

y : number
engine/Source/Core/Quaternion.js 34

The Y component.
Default Value: 0.0

z : number
engine/Source/Core/Quaternion.js 41

The Z component.
Default Value: 0.0

Methods

static Cesium.Quaternion.add(left, right, result) → Quaternion
engine/Source/Core/Quaternion.js 511

Computes the componentwise sum of two quaternions.
Name Type Description
left Quaternion The first quaternion.
right Quaternion The second quaternion.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.

static Cesium.Quaternion.clone(quaternion, result) → Quaternion
engine/Source/Core/Quaternion.js 391

Duplicates a Quaternion instance.
Name Type Description
quaternion Quaternion The quaternion to duplicate.
result Quaternion optional The object onto which to store the result.
Returns:
The modified result parameter or a new Quaternion instance if one was not provided. (Returns undefined if quaternion is undefined)

static Cesium.Quaternion.computeAngle(quaternion) → number
engine/Source/Core/Quaternion.js 703

Computes the angle of rotation of the provided quaternion.
Name Type Description
quaternion Quaternion The quaternion to use.
Returns:
The angle of rotation.

static Cesium.Quaternion.computeAxis(quaternion, result) → Cartesian3
engine/Source/Core/Quaternion.js 673

Computes the axis of rotation of the provided quaternion.
Name Type Description
quaternion Quaternion The quaternion to use.
result Cartesian3 The object onto which to store the result.
Returns:
The modified result parameter.

static Cesium.Quaternion.computeInnerQuadrangle(q0, q1, q2, result) → Quaternion
engine/Source/Core/Quaternion.js 858

Computes an inner quadrangle point.

This will compute quaternions that ensure a squad curve is C1.

Name Type Description
q0 Quaternion The first quaternion.
q1 Quaternion The second quaternion.
q2 Quaternion The third quaternion.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.
See:
  • Quaternion#squad

static Cesium.Quaternion.conjugate(quaternion, result) → Quaternion
engine/Source/Core/Quaternion.js 419

Computes the conjugate of the provided quaternion.
Name Type Description
quaternion Quaternion The quaternion to conjugate.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.

static Cesium.Quaternion.convertPackedArrayForInterpolation(packedArray, startingIndex, lastIndex, result)
engine/Source/Core/Quaternion.js 291

Converts a packed array into a form suitable for interpolation.
Name Type Default Description
packedArray Array.<number> The packed array.
startingIndex number 0 optional The index of the first element to be converted.
lastIndex number packedArray.length optional The index of the last element to be converted.
result Array.<number> optional The object into which to store the result.

static Cesium.Quaternion.divideByScalar(quaternion, scalar, result) → Quaternion
engine/Source/Core/Quaternion.js 652

Divides the provided quaternion componentwise by the provided scalar.
Name Type Description
quaternion Quaternion The quaternion to be divided.
scalar number The scalar to divide by.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.

static Cesium.Quaternion.dot(left, right) → number
engine/Source/Core/Quaternion.js 574

Computes the dot (scalar) product of two quaternions.
Name Type Description
left Quaternion The first quaternion.
right Quaternion The second quaternion.
Returns:
The dot product.

static Cesium.Quaternion.equals(left, right) → boolean
engine/Source/Core/Quaternion.js 1052

Compares the provided quaternions componentwise and returns true if they are equal, false otherwise.
Name Type Description
left Quaternion optional The first quaternion.
right Quaternion optional The second quaternion.
Returns:
true if left and right are equal, false otherwise.

static Cesium.Quaternion.equalsEpsilon(left, right, epsilon) → boolean
engine/Source/Core/Quaternion.js 1074

Compares the provided quaternions componentwise and returns true if they are within the provided epsilon, false otherwise.
Name Type Default Description
left Quaternion optional The first quaternion.
right Quaternion optional The second quaternion.
epsilon number 0 optional The epsilon to use for equality testing.
Returns:
true if left and right are within the provided epsilon, false otherwise.

static Cesium.Quaternion.exp(cartesian, result) → Quaternion
engine/Source/Core/Quaternion.js 820

The exponential quaternion function.
Name Type Description
cartesian Cartesian3 The cartesian.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.

static Cesium.Quaternion.fastSlerp(start, end, t, result) → Quaternion
engine/Source/Core/Quaternion.js 950

Computes the spherical linear interpolation or extrapolation at t using the provided quaternions. This implementation is faster than Quaternion#slerp, but is only accurate up to 10-6.
Name Type Description
start Quaternion The value corresponding to t at 0.0.
end Quaternion The value corresponding to t at 1.0.
t number The point along t at which to interpolate.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.
See:
  • Quaternion#slerp

static Cesium.Quaternion.fastSquad(q0, q1, s0, s1, t, result) → Quaternion
engine/Source/Core/Quaternion.js 1029

Computes the spherical quadrangle interpolation between quaternions. An implementation that is faster than Quaternion#squad, but less accurate.
Name Type Description
q0 Quaternion The first quaternion.
q1 Quaternion The second quaternion.
s0 Quaternion The first inner quadrangle.
s1 Quaternion The second inner quadrangle.
t number The time in [0,1] used to interpolate.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter or a new instance if none was provided.
See:
  • Quaternion#squad

static Cesium.Quaternion.fromAxisAngle(axis, angle, result) → Quaternion
engine/Source/Core/Quaternion.js 61

Computes a quaternion representing a rotation around an axis.
Name Type Description
axis Cartesian3 The axis of rotation.
angle number The angle in radians to rotate around the axis.
result Quaternion optional The object onto which to store the result.
Returns:
The modified result parameter or a new Quaternion instance if one was not provided.

static Cesium.Quaternion.fromHeadingPitchRoll(headingPitchRoll, result) → Quaternion
engine/Source/Core/Quaternion.js 187

Computes a rotation from the given heading, pitch and roll angles. Heading is the rotation about the negative z axis. Pitch is the rotation about the negative y axis. Roll is the rotation about the positive x axis.
Name Type Description
headingPitchRoll HeadingPitchRoll The rotation expressed as a heading, pitch and roll.
result Quaternion optional The object onto which to store the result.
Returns:
The modified result parameter or a new Quaternion instance if none was provided.

static Cesium.Quaternion.fromRotationMatrix(matrix, result) → Quaternion
engine/Source/Core/Quaternion.js 96

Computes a Quaternion from the provided Matrix3 instance.
Name Type Description
matrix Matrix3 The rotation matrix.
result Quaternion optional The object onto which to store the result.
Returns:
The modified result parameter or a new Quaternion instance if one was not provided.
See:

static Cesium.Quaternion.inverse(quaternion, result) → Quaternion
engine/Source/Core/Quaternion.js 493

Computes the inverse of the provided quaternion.
Name Type Description
quaternion Quaternion The quaternion to normalize.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.

static Cesium.Quaternion.lerp(start, end, t, result) → Quaternion
engine/Source/Core/Quaternion.js 724

Computes the linear interpolation or extrapolation at t using the provided quaternions.
Name Type Description
start Quaternion The value corresponding to t at 0.0.
end Quaternion The value corresponding to t at 1.0.
t number The point along t at which to interpolate.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.

static Cesium.Quaternion.log(quaternion, result) → Cartesian3
engine/Source/Core/Quaternion.js 797

The logarithmic quaternion function.
Name Type Description
quaternion Quaternion The unit quaternion.
result Cartesian3 The object onto which to store the result.
Returns:
The modified result parameter.

static Cesium.Quaternion.magnitude(quaternion) → number
engine/Source/Core/Quaternion.js 457

Computes magnitude for the provided quaternion.
Name Type Description
quaternion Quaternion The quaternion to conjugate.
Returns:
The magnitude.

static Cesium.Quaternion.magnitudeSquared(quaternion) → number
engine/Source/Core/Quaternion.js 438

Computes magnitude squared for the provided quaternion.
Name Type Description
quaternion Quaternion The quaternion to conjugate.
Returns:
The magnitude squared.

static Cesium.Quaternion.multiply(left, right, result) → Quaternion
engine/Source/Core/Quaternion.js 593

Computes the product of two quaternions.
Name Type Description
left Quaternion The first quaternion.
right Quaternion The second quaternion.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.

static Cesium.Quaternion.multiplyByScalar(quaternion, scalar, result) → Quaternion
engine/Source/Core/Quaternion.js 630

Multiplies the provided quaternion componentwise by the provided scalar.
Name Type Description
quaternion Quaternion The quaternion to be scaled.
scalar number The scalar to multiply with.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.

static Cesium.Quaternion.negate(quaternion, result) → Quaternion
engine/Source/Core/Quaternion.js 554

Negates the provided quaternion.
Name Type Description
quaternion Quaternion The quaternion to be negated.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.

static Cesium.Quaternion.normalize(quaternion, result) → Quaternion
engine/Source/Core/Quaternion.js 468

Computes the normalized form of the provided quaternion.
Name Type Description
quaternion Quaternion The quaternion to normalize.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.

static Cesium.Quaternion.pack(value, array, startingIndex) → Array.<number>
engine/Source/Core/Quaternion.js 236

Stores the provided instance into the provided array.
Name Type Default Description
value Quaternion The value to pack.
array Array.<number> The array to pack into.
startingIndex number 0 optional The index into the array at which to start packing the elements.
Returns:
The array that was packed into

static Cesium.Quaternion.slerp(start, end, t, result) → Quaternion
engine/Source/Core/Quaternion.js 751

Computes the spherical linear interpolation or extrapolation at t using the provided quaternions.
Name Type Description
start Quaternion The value corresponding to t at 0.0.
end Quaternion The value corresponding to t at 1.0.
t number The point along t at which to interpolate.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.
See:
  • Quaternion#fastSlerp

static Cesium.Quaternion.squad(q0, q1, s0, s1, t, result) → Quaternion
engine/Source/Core/Quaternion.js 905

Computes the spherical quadrangle interpolation between quaternions.
Name Type Description
q0 Quaternion The first quaternion.
q1 Quaternion The second quaternion.
s0 Quaternion The first inner quadrangle.
s1 Quaternion The second inner quadrangle.
t number The time in [0,1] used to interpolate.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.
Example:
// 1. compute the squad interpolation between two quaternions on a curve
const s0 = Cesium.Quaternion.computeInnerQuadrangle(quaternions[i - 1], quaternions[i], quaternions[i + 1], new Cesium.Quaternion());
const s1 = Cesium.Quaternion.computeInnerQuadrangle(quaternions[i], quaternions[i + 1], quaternions[i + 2], new Cesium.Quaternion());
const q = Cesium.Quaternion.squad(quaternions[i], quaternions[i + 1], s0, s1, t, new Cesium.Quaternion());

// 2. compute the squad interpolation as above but where the first quaternion is a end point.
const s1 = Cesium.Quaternion.computeInnerQuadrangle(quaternions[0], quaternions[1], quaternions[2], new Cesium.Quaternion());
const q = Cesium.Quaternion.squad(quaternions[0], quaternions[1], quaternions[0], s1, t, new Cesium.Quaternion());
See:
  • Quaternion#computeInnerQuadrangle

static Cesium.Quaternion.subtract(left, right, result) → Quaternion
engine/Source/Core/Quaternion.js 533

Computes the componentwise difference of two quaternions.
Name Type Description
left Quaternion The first quaternion.
right Quaternion The second quaternion.
result Quaternion The object onto which to store the result.
Returns:
The modified result parameter.

static Cesium.Quaternion.unpack(array, startingIndex, result) → Quaternion
engine/Source/Core/Quaternion.js 260

Retrieves an instance from a packed array.
Name Type Default Description
array Array.<number> The packed array.
startingIndex number 0 optional The starting index of the element to be unpacked.
result Quaternion optional The object into which to store the result.
Returns:
The modified result parameter or a new Quaternion instance if one was not provided.

static Cesium.Quaternion.unpackInterpolationResult(array, sourceArray, firstIndex, lastIndex, result) → Quaternion
engine/Source/Core/Quaternion.js 352

Retrieves an instance from a packed array converted with convertPackedArrayForInterpolation.
Name Type Default Description
array Array.<number> The array previously packed for interpolation.
sourceArray Array.<number> The original packed array.
firstIndex number 0 optional The firstIndex used to convert the array.
lastIndex number packedArray.length optional The lastIndex used to convert the array.
result Quaternion optional The object into which to store the result.
Returns:
The modified result parameter or a new Quaternion instance if one was not provided.

clone(result) → Quaternion
engine/Source/Core/Quaternion.js 1110

Duplicates this Quaternion instance.
Name Type Description
result Quaternion optional The object onto which to store the result.
Returns:
The modified result parameter or a new Quaternion instance if one was not provided.

equals(right) → boolean
engine/Source/Core/Quaternion.js 1121

Compares this and the provided quaternion componentwise and returns true if they are equal, false otherwise.
Name Type Description
right Quaternion optional The right hand side quaternion.
Returns:
true if left and right are equal, false otherwise.

equalsEpsilon(right, epsilon) → boolean
engine/Source/Core/Quaternion.js 1134

Compares this and the provided quaternion componentwise and returns true if they are within the provided epsilon, false otherwise.
Name Type Default Description
right Quaternion optional The right hand side quaternion.
epsilon number 0 optional The epsilon to use for equality testing.
Returns:
true if left and right are within the provided epsilon, false otherwise.

toString() → string
engine/Source/Core/Quaternion.js 1143

Returns a string representing this quaternion in the format (x, y, z, w).
Returns:
A string representing this Quaternion.
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