OrthographicFrustum
查阅Mars3D API

new Cesium.OrthographicFrustum(options)
engine/Source/Core/OrthographicFrustum.js 30

The viewing frustum is defined by 6 planes. Each plane is represented by a Cartesian4 object, where the x, y, and z components define the unit vector normal to the plane, and the w component is the distance of the plane from the origin/camera position.
参数名称 类型 描述信息
options object 可选 An object with the following properties:
参数名称 类型 默认值 描述信息
width number 可选 The width of the frustum in meters.
aspectRatio number 可选 The aspect ratio of the frustum's width to it's height.
near number 1.0 可选 The distance of the near plane.
far number 500000000.0 可选 The distance of the far plane.
使用示例:
const maxRadii = ellipsoid.maximumRadius;

const frustum = new Cesium.OrthographicFrustum();
frustum.near = 0.01 * maxRadii;
frustum.far = 50.0 * maxRadii;

成员(属性)

static Cesium.OrthographicFrustum.packedLength : number
engine/Source/Core/OrthographicFrustum.js 72

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

aspectRatio : number|undefined
engine/Source/Core/OrthographicFrustum.js 48

The aspect ratio of the frustum's width to it's height.
默认值: undefined

far : number
engine/Source/Core/OrthographicFrustum.js 64

The distance of the far plane.
默认值: 500000000.0;

near : number
engine/Source/Core/OrthographicFrustum.js 56

The distance of the near plane.
默认值: 1.0

readonly projectionMatrix : Matrix4
engine/Source/Core/OrthographicFrustum.js 181

Gets the orthographic projection matrix computed from the view frustum.

width : number|undefined
engine/Source/Core/OrthographicFrustum.js 40

The horizontal width of the frustum in meters.
默认值: undefined

方法

static Cesium.OrthographicFrustum.pack(value, array, startingIndex) → Array.<number>
engine/Source/Core/OrthographicFrustum.js 83

Stores the provided instance into the provided array.
参数名称 类型 默认值 描述信息
value OrthographicFrustum 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.OrthographicFrustum.unpack(array, startingIndex, result) → OrthographicFrustum
engine/Source/Core/OrthographicFrustum.js 107

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 OrthographicFrustum 可选 The object into which to store the result.
返回值:
The modified result parameter or a new OrthographicFrustum instance if one was not provided.

clone(result) → OrthographicFrustum
engine/Source/Core/OrthographicFrustum.js 266

Returns a duplicate of a OrthographicFrustum instance.
参数名称 类型 描述信息
result OrthographicFrustum 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new OrthographicFrustum instance if one was not provided.

computeCullingVolume(position, direction, up) → CullingVolume
engine/Source/Core/OrthographicFrustum.js 215

Creates a culling volume for this frustum.
参数名称 类型 描述信息
position Cartesian3 The eye position.
direction Cartesian3 The view direction.
up Cartesian3 The up direction.
返回值:
A culling volume at the given position and orientation.
使用示例:
// Check if a bounding volume intersects the frustum.
const cullingVolume = frustum.computeCullingVolume(cameraPosition, cameraDirection, cameraUp);
const intersect = cullingVolume.computeVisibility(boundingVolume);

equals(other) → boolean
engine/Source/Core/OrthographicFrustum.js 294

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

equalsEpsilon(other, relativeEpsilon, absoluteEpsilon) → boolean
engine/Source/Core/OrthographicFrustum.js 319

Compares the provided OrthographicFrustum componentwise and returns true if they pass an absolute or relative tolerance test, false otherwise.
参数名称 类型 默认值 描述信息
other OrthographicFrustum The right hand side OrthographicFrustum.
relativeEpsilon number The relative epsilon tolerance to use for equality testing.
absoluteEpsilon number relativeEpsilon 可选 The absolute epsilon tolerance to use for equality testing.
返回值:
true if this and other are within the provided epsilon, false otherwise.

getPixelDimensions(drawingBufferWidth, drawingBufferHeight, distance, pixelRatio, result) → Cartesian2
engine/Source/Core/OrthographicFrustum.js 243

Returns the pixel's width and height in meters.
参数名称 类型 描述信息
drawingBufferWidth number The width of the drawing buffer.
drawingBufferHeight number The height of the drawing buffer.
distance number The distance to the near plane in meters.
pixelRatio number The scaling factor from pixel space to coordinate space.
result Cartesian2 The object onto which to store the result.
返回值:
The modified result parameter or a new instance of Cartesian2 with the pixel's width and height in the x and y properties, respectively.
Throws:
使用示例:
// Example 1
// Get the width and height of a pixel.
const pixelSize = camera.frustum.getPixelDimensions(scene.drawingBufferWidth, scene.drawingBufferHeight, 0.0, scene.pixelRatio, new Cesium.Cartesian2());
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