BoundingSphere
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new Cesium.BoundingSphere(center, radius)
engine/Source/Core/BoundingSphere.js 27

A bounding sphere with a center and a radius.
参数名称 类型 默认值 描述信息
center Cartesian3 Cartesian3.ZERO 可选 The center of the bounding sphere.
radius number 0.0 可选 The radius of the bounding sphere.
参考:

成员(属性)

static Cesium.BoundingSphere.packedLength : number
engine/Source/Core/BoundingSphere.js 941

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

center : Cartesian3
engine/Source/Core/BoundingSphere.js 33

The center point of the sphere.
默认值: Cartesian3.ZERO

radius : number
engine/Source/Core/BoundingSphere.js 40

The radius of the sphere.
默认值: 0.0

方法

static Cesium.BoundingSphere.clone(sphere, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 923

Duplicates a BoundingSphere instance.
参数名称 类型 描述信息
sphere BoundingSphere The bounding sphere to duplicate.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided. (Returns undefined if sphere is undefined)

static Cesium.BoundingSphere.computePlaneDistances(sphere, position, direction, result) → Interval
engine/Source/Core/BoundingSphere.js 1227

The distances calculated by the vector from the center of the bounding sphere to position projected onto direction plus/minus the radius of the bounding sphere.
If you imagine the infinite number of planes with normal direction, this computes the smallest distance to the closest and farthest planes from position that intersect the bounding sphere.
参数名称 类型 描述信息
sphere BoundingSphere The bounding sphere to calculate the distance to.
position Cartesian3 The position to calculate the distance from.
direction Cartesian3 The direction from position.
result Interval 可选 A Interval to store the nearest and farthest distances.
返回值:
The nearest and farthest distances on the bounding sphere from position in direction.

static Cesium.BoundingSphere.distanceSquaredTo(sphere, cartesian) → number
engine/Source/Core/BoundingSphere.js 1158

Computes the estimated distance squared from the closest point on a bounding sphere to a point.
参数名称 类型 描述信息
sphere BoundingSphere The sphere.
cartesian Cartesian3 The point
返回值:
The distance squared from the bounding sphere to the point. Returns 0 if the point is inside the sphere.
使用示例:
// Sort bounding spheres from back to front
spheres.sort(function(a, b) {
    return Cesium.BoundingSphere.distanceSquaredTo(b, camera.positionWC) - Cesium.BoundingSphere.distanceSquaredTo(a, camera.positionWC);
});

static Cesium.BoundingSphere.equals(left, right) → boolean
engine/Source/Core/BoundingSphere.js 1402

Compares the provided BoundingSphere componentwise and returns true if they are equal, false otherwise.
参数名称 类型 描述信息
left BoundingSphere 可选 The first BoundingSphere.
right BoundingSphere 可选 The second BoundingSphere.
返回值:
true if left and right are equal, false otherwise.

static Cesium.BoundingSphere.expand(sphere, point, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 1066

Computes a bounding sphere by enlarging the provided sphere to contain the provided point.
参数名称 类型 描述信息
sphere BoundingSphere A sphere to expand.
point Cartesian3 A point to enclose in a bounding sphere.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided.

static Cesium.BoundingSphere.fromBoundingSpheres(boundingSpheres, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 802

Computes a tight-fitting bounding sphere enclosing the provided array of bounding spheres.
参数名称 类型 描述信息
boundingSpheres Array.<BoundingSphere> 可选 The array of bounding spheres.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided.

static Cesium.BoundingSphere.fromCornerPoints(corner, oppositeCorner, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 754

Computes a bounding sphere from the corner points of an axis-aligned bounding box. The sphere tightly and fully encompasses the box.
参数名称 类型 描述信息
corner Cartesian3 可选 The minimum height over the rectangle.
oppositeCorner Cartesian3 可选 The maximum height over the rectangle.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided.
使用示例:
// Create a bounding sphere around the unit cube
const sphere = Cesium.BoundingSphere.fromCornerPoints(new Cesium.Cartesian3(-0.5, -0.5, -0.5), new Cesium.Cartesian3(0.5, 0.5, 0.5));

static Cesium.BoundingSphere.fromEllipsoid(ellipsoid, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 779

Creates a bounding sphere encompassing an ellipsoid.
参数名称 类型 描述信息
ellipsoid Ellipsoid The ellipsoid around which to create a bounding sphere.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided.
使用示例:
const boundingSphere = Cesium.BoundingSphere.fromEllipsoid(ellipsoid);

static Cesium.BoundingSphere.fromEncodedCartesianVertices(positionsHigh, positionsLow, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 567

Computes a tight-fitting bounding sphere enclosing a list of EncodedCartesian3s, where the points are stored in parallel flat arrays in X, Y, Z, order. The bounding sphere is computed by running two algorithms, a naive algorithm and Ritter's algorithm. The smaller of the two spheres is used to ensure a tight fit.
参数名称 类型 描述信息
positionsHigh Array.<number> 可选 An array of high bits of the encoded cartesians that the bounding sphere will enclose. Each point is formed from three elements in the array in the order X, Y, Z.
positionsLow Array.<number> 可选 An array of low bits of the encoded cartesians that the bounding sphere will enclose. Each point is formed from three elements in the array in the order X, Y, Z.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if one was not provided.
参考:

static Cesium.BoundingSphere.fromOrientedBoundingBox(orientedBoundingBox, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 856

Computes a tight-fitting bounding sphere enclosing the provided oriented bounding box.
参数名称 类型 描述信息
orientedBoundingBox OrientedBoundingBox The oriented bounding box.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided.

static Cesium.BoundingSphere.fromPoints(positions, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 68

Computes a tight-fitting bounding sphere enclosing a list of 3D Cartesian points. The bounding sphere is computed by running two algorithms, a naive algorithm and Ritter's algorithm. The smaller of the two spheres is used to ensure a tight fit.
参数名称 类型 描述信息
positions Array.<Cartesian3> 可选 An array of points that the bounding sphere will enclose. Each point must have x, y, and z properties.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if one was not provided.
参考:

static Cesium.BoundingSphere.fromRectangle2D(rectangle, projection, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 240

Computes a bounding sphere from a rectangle projected in 2D.
参数名称 类型 默认值 描述信息
rectangle Rectangle 可选 The rectangle around which to create a bounding sphere.
projection object GeographicProjection 可选 The projection used to project the rectangle into 2D.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided.

static Cesium.BoundingSphere.fromRectangle3D(rectangle, ellipsoid, surfaceHeight, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 319

Computes a bounding sphere from a rectangle in 3D. The bounding sphere is created using a subsample of points on the ellipsoid and contained in the rectangle. It may not be accurate for all rectangles on all types of ellipsoids.
参数名称 类型 默认值 描述信息
rectangle Rectangle 可选 The valid rectangle used to create a bounding sphere.
ellipsoid Ellipsoid Ellipsoid.WGS84 可选 The ellipsoid used to determine positions of the rectangle.
surfaceHeight number 0.0 可选 The height above the surface of the ellipsoid.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided.

static Cesium.BoundingSphere.fromRectangleWithHeights2D(rectangle, projection, minimumHeight, maximumHeight, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 261

Computes a bounding sphere from a rectangle projected in 2D. The bounding sphere accounts for the object's minimum and maximum heights over the rectangle.
参数名称 类型 默认值 描述信息
rectangle Rectangle 可选 The rectangle around which to create a bounding sphere.
projection object GeographicProjection 可选 The projection used to project the rectangle into 2D.
minimumHeight number 0.0 可选 The minimum height over the rectangle.
maximumHeight number 0.0 可选 The maximum height over the rectangle.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided.

static Cesium.BoundingSphere.fromTransformation(transformation, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 892

Computes a tight-fitting bounding sphere enclosing the provided affine transformation.
参数名称 类型 描述信息
transformation Matrix4 The affine transformation.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided.

static Cesium.BoundingSphere.fromVertices(positions, center, stride, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 379

Computes a tight-fitting bounding sphere enclosing a list of 3D points, where the points are stored in a flat array in X, Y, Z, order. The bounding sphere is computed by running two algorithms, a naive algorithm and Ritter's algorithm. The smaller of the two spheres is used to ensure a tight fit.
参数名称 类型 默认值 描述信息
positions Array.<number> 可选 An array of points that the bounding sphere will enclose. Each point is formed from three elements in the array in the order X, Y, Z.
center Cartesian3 Cartesian3.ZERO 可选 The position to which the positions are relative, which need not be the origin of the coordinate system. This is useful when the positions are to be used for relative-to-center (RTC) rendering.
stride number 3 可选 The number of array elements per vertex. It must be at least 3, but it may be higher. Regardless of the value of this parameter, the X coordinate of the first position is at array index 0, the Y coordinate is at array index 1, and the Z coordinate is at array index 2. When stride is 3, the X coordinate of the next position then begins at array index 3. If the stride is 5, however, two array elements are skipped and the next position begins at array index 5.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if one was not provided.
使用示例:
// Compute the bounding sphere from 3 positions, each specified relative to a center.
// In addition to the X, Y, and Z coordinates, the points array contains two additional
// elements per point which are ignored for the purpose of computing the bounding sphere.
const center = new Cesium.Cartesian3(1.0, 2.0, 3.0);
const points = [1.0, 2.0, 3.0, 0.1, 0.2,
              4.0, 5.0, 6.0, 0.1, 0.2,
              7.0, 8.0, 9.0, 0.1, 0.2];
const sphere = Cesium.BoundingSphere.fromVertices(points, center, 5);
参考:

static Cesium.BoundingSphere.intersectPlane(sphere, plane) → Intersect
engine/Source/Core/BoundingSphere.js 1094

Determines which side of a plane a sphere is located.
参数名称 类型 描述信息
sphere BoundingSphere The bounding sphere to test.
plane Plane The plane to test against.
返回值:
Intersect.INSIDE if the entire sphere is on the side of the plane the normal is pointing, Intersect.OUTSIDE if the entire sphere is on the opposite side, and Intersect.INTERSECTING if the sphere intersects the plane.

static Cesium.BoundingSphere.isOccluded(sphere, occluder) → boolean
engine/Source/Core/BoundingSphere.js 1386

Determines whether or not a sphere is hidden from view by the occluder.
参数名称 类型 描述信息
sphere BoundingSphere The bounding sphere surrounding the occludee object.
occluder Occluder The occluder.
返回值:
true if the sphere is not visible; otherwise false.

static Cesium.BoundingSphere.pack(value, array, startingIndex) → Array.<number>
engine/Source/Core/BoundingSphere.js 952

Stores the provided instance into the provided array.
参数名称 类型 默认值 描述信息
value BoundingSphere The value to pack.
array Array.<number> The array to pack into.
startingIndex number 0 可选 The index into the array at which to start packing the elements.
返回值:
The array that was packed into

static Cesium.BoundingSphere.projectTo2D(sphere, projection, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 1275

Creates a bounding sphere in 2D from a bounding sphere in 3D world coordinates.
参数名称 类型 默认值 描述信息
sphere BoundingSphere The bounding sphere to transform to 2D.
projection object GeographicProjection 可选 The projection to 2D.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided.

static Cesium.BoundingSphere.transform(sphere, transform, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 1123

Applies a 4x4 affine transformation matrix to a bounding sphere.
参数名称 类型 描述信息
sphere BoundingSphere The bounding sphere to apply the transformation to.
transform Matrix4 The transformation matrix to apply to the bounding sphere.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided.

static Cesium.BoundingSphere.transformWithoutScale(sphere, transform, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 1193

Applies a 4x4 affine transformation matrix to a bounding sphere where there is no scale The transformation matrix is not verified to have a uniform scale of 1. This method is faster than computing the general bounding sphere transform using BoundingSphere.transform.
参数名称 类型 描述信息
sphere BoundingSphere The bounding sphere to apply the transformation to.
transform Matrix4 The transformation matrix to apply to the bounding sphere.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided.
使用示例:
const modelMatrix = Cesium.Transforms.eastNorthUpToFixedFrame(positionOnEllipsoid);
const boundingSphere = new Cesium.BoundingSphere();
const newBoundingSphere = Cesium.BoundingSphere.transformWithoutScale(boundingSphere, modelMatrix);

static Cesium.BoundingSphere.union(left, right, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 1006

Computes a bounding sphere that contains both the left and right bounding spheres.
参数名称 类型 描述信息
left BoundingSphere A sphere to enclose in a bounding sphere.
right BoundingSphere A sphere to enclose in a bounding sphere.
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided.

static Cesium.BoundingSphere.unpack(array, startingIndex, result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 977

Retrieves an instance from a packed array.
参数名称 类型 默认值 描述信息
array Array.<number> The packed array.
startingIndex number 0 可选 The starting index of the element to be unpacked.
result BoundingSphere 可选 The object into which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if one was not provided.

clone(result) → BoundingSphere
engine/Source/Core/BoundingSphere.js 1493

Duplicates this BoundingSphere instance.
参数名称 类型 描述信息
result BoundingSphere 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new BoundingSphere instance if none was provided.

computePlaneDistances(position, direction, result) → Interval
engine/Source/Core/BoundingSphere.js 1453

The distances calculated by the vector from the center of the bounding sphere to position projected onto direction plus/minus the radius of the bounding sphere.
If you imagine the infinite number of planes with normal direction, this computes the smallest distance to the closest and farthest planes from position that intersect the bounding sphere.
参数名称 类型 描述信息
position Cartesian3 The position to calculate the distance from.
direction Cartesian3 The direction from position.
result Interval 可选 A Interval to store the nearest and farthest distances.
返回值:
The nearest and farthest distances on the bounding sphere from position in direction.

distanceSquaredTo(cartesian) → number
engine/Source/Core/BoundingSphere.js 1437

Computes the estimated distance squared from the closest point on a bounding sphere to a point.
参数名称 类型 描述信息
cartesian Cartesian3 The point
返回值:
The estimated distance squared from the bounding sphere to the point.
使用示例:
// Sort bounding spheres from back to front
spheres.sort(function(a, b) {
    return b.distanceSquaredTo(camera.positionWC) - a.distanceSquaredTo(camera.positionWC);
});

equals(right) → boolean
engine/Source/Core/BoundingSphere.js 1483

Compares this BoundingSphere against the provided BoundingSphere componentwise and returns true if they are equal, false otherwise.
参数名称 类型 描述信息
right BoundingSphere 可选 The right hand side BoundingSphere.
返回值:
true if they are equal, false otherwise.

intersectPlane(plane) → Intersect
engine/Source/Core/BoundingSphere.js 1421

Determines which side of a plane the sphere is located.
参数名称 类型 描述信息
plane Plane The plane to test against.
返回值:
Intersect.INSIDE if the entire sphere is on the side of the plane the normal is pointing, Intersect.OUTSIDE if the entire sphere is on the opposite side, and Intersect.INTERSECTING if the sphere intersects the plane.

isOccluded(occluder) → boolean
engine/Source/Core/BoundingSphere.js 1472

Determines whether or not a sphere is hidden from view by the occluder.
参数名称 类型 描述信息
occluder Occluder The occluder.
返回值:
true if the sphere is not visible; otherwise false.

volume() → number
engine/Source/Core/BoundingSphere.js 1501

Computes the radius of the BoundingSphere.
返回值:
The radius of the BoundingSphere.
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