OrthographicFrustum

new Cesium.OrthographicFrustum(options)
Core/OrthographicFrustum.js 39

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.
Name Type Description
options Object optional An object with the following properties:
Name Type Default Description
width Number optional The width of the frustum in meters.
aspectRatio Number optional The aspect ratio of the frustum's width to it's height.
near Number 1.0 optional The distance of the near plane.
far Number 500000000.0 optional The distance of the far plane.
Example:
var maxRadii = ellipsoid.maximumRadius;

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

Members

staticCesium.OrthographicFrustum.packedLength : Number
Core/OrthographicFrustum.js 81

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

aspectRatio : Number
Core/OrthographicFrustum.js 57

The aspect ratio of the frustum's width to it's height.
Default Value: undefined

far : Number
Core/OrthographicFrustum.js 73

The distance of the far plane.
Default Value: 500000000.0;

near : Number
Core/OrthographicFrustum.js 65

The distance of the near plane.
Default Value: 1.0

readonlyprojectionMatrix : Matrix4
Core/OrthographicFrustum.js 178

Gets the orthographic projection matrix computed from the view frustum.

width : Number
Core/OrthographicFrustum.js 49

The horizontal width of the frustum in meters.
Default Value: undefined

Methods

staticCesium.OrthographicFrustum.pack(value, array, startingIndex) → Array.<Number>
Core/OrthographicFrustum.js 92

Stores the provided instance into the provided array.
Name Type Default Description
value OrthographicFrustum 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

staticCesium.OrthographicFrustum.unpack(array, startingIndex, result) → OrthographicFrustum
Core/OrthographicFrustum.js 116

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

clone(result) → OrthographicFrustum
Core/OrthographicFrustum.js 233

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

computeCullingVolume(position, direction, up) → CullingVolume
Core/OrthographicFrustum.js 200

Creates a culling volume for this frustum.
Name Type Description
position Cartesian3 The eye position.
direction Cartesian3 The view direction.
up Cartesian3 The up direction.
Returns:
A culling volume at the given position and orientation.
Example:
// Check if a bounding volume intersects the frustum.
var cullingVolume = frustum.computeCullingVolume(cameraPosition, cameraDirection, cameraUp);
var intersect = cullingVolume.computeVisibility(boundingVolume);

equals(other) → Boolean
Core/OrthographicFrustum.js 261

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

getPixelDimensions(drawingBufferWidth, drawingBufferHeight, distance, result) → Cartesian2
Core/OrthographicFrustum.js 222

Returns the pixel's width and height in meters.
Name Type Description
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.
result Cartesian2 The object onto which to store the result.
Returns:
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:
Example:
// Example 1
// Get the width and height of a pixel.
var pixelSize = camera.frustum.getPixelDimensions(scene.drawingBufferWidth, scene.drawingBufferHeight, 0.0, new Cesium.Cartesian2());