KBE3D / KBCore / Cesium / OrthographicFrustum

类: OrthographicFrustum

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.

示例

const maxRadii = ellipsoid.maximumRadius;

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

参数

An object with the following properties:

参数

The width of the frustum in meters.

参数

The aspect ratio of the frustum's width to it's height.

参数

The distance of the near plane.

参数

The distance of the far plane.

属性

packedLength

static packedLength: number

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

---

width

width: number | undefined

The horizontal width of the frustum in meters.

---

aspectRatio

aspectRatio: number | undefined

The aspect ratio of the frustum's width to it's height.

---

near

near: number

The distance of the near plane.

---

far

far: number

The distance of the far plane.

---

projectionMatrix

readonly projectionMatrix: Matrix4

Gets the orthographic projection matrix computed from the view frustum.

方法

pack()

static pack(value: OrthographicFrustum, array: number[], startingIndex?: number): number[]

Stores the provided instance into the provided array.

参数

value

OrthographicFrustum

The value to pack.

array

number[]

The array to pack into.

startingIndex?

number

The index into the array at which to start packing the elements.

返回

number[]

The array that was packed into

---

unpack()

static unpack(array: number[], startingIndex?: number, result?: OrthographicFrustum): OrthographicFrustum

Retrieves an instance from a packed array.

参数

array

number[]

The packed array.

startingIndex?

number

The starting index of the element to be unpacked.

result?

OrthographicFrustum

The object into which to store the result.

返回

OrthographicFrustum

The modified result parameter or a new OrthographicFrustum instance if one was not provided.

---

computeCullingVolume()

computeCullingVolume(position: Cartesian3, direction: Cartesian3, up: Cartesian3): CullingVolume

Creates a culling volume for this frustum.

参数

position

Cartesian3

The eye position.

direction

Cartesian3

The view direction.

up

Cartesian3

The up direction.

返回

CullingVolume

A culling volume at the given position and orientation.

示例

// Check if a bounding volume intersects the frustum.
const cullingVolume = frustum.computeCullingVolume(cameraPosition, cameraDirection, cameraUp);
const intersect = cullingVolume.computeVisibility(boundingVolume);

---

getPixelDimensions()

getPixelDimensions(drawingBufferWidth: number, drawingBufferHeight: number, distance: number, pixelRatio: number, result: Cartesian2): Cartesian2

Returns the pixel's width and height in meters.

参数

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

Cartesian2

The modified result parameter or a new instance of Cartesian2 with the pixel's width and height in the x and y properties, respectively.

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());

---

clone()

clone(result?: OrthographicFrustum): OrthographicFrustum

Returns a duplicate of a OrthographicFrustum instance.

参数

result?

OrthographicFrustum

The object onto which to store the result.

返回

OrthographicFrustum

The modified result parameter or a new OrthographicFrustum instance if one was not provided.

---

equals()

equals(other?: OrthographicFrustum): boolean

Compares the provided OrthographicFrustum componentwise and returns <code>true</code> if they are equal, <code>false</code> otherwise.

参数

other?

OrthographicFrustum

The right hand side OrthographicFrustum.

返回

boolean

true if they are equal, false otherwise.

---

equalsEpsilon()

equalsEpsilon(other: OrthographicFrustum, relativeEpsilon: number, absoluteEpsilon?: number): boolean

Compares the provided OrthographicFrustum componentwise and returns <code>true</code> if they pass an absolute or relative tolerance test, <code>false</code> otherwise.

参数

other

OrthographicFrustum

The right hand side OrthographicFrustum.

relativeEpsilon

number

The relative epsilon tolerance to use for equality testing.

absoluteEpsilon?

number

The absolute epsilon tolerance to use for equality testing.

返回

boolean

true if this and other are within the provided epsilon, false otherwise.

构造函数

构造函数

new OrthographicFrustum(options?: { width?: number; aspectRatio?: number; near?: number; far?: number; }): OrthographicFrustum

参数

options?

width?

number

aspectRatio?

number

near?

number

far?

number

返回

OrthographicFrustum