OrthographicFrustum

new Cesium.OrthographicFrustum()
Scene/OrthographicFrustum.js 42

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.
Example:
var maxRadii = ellipsoid.maximumRadius;

var frustum = new Cesium.OrthographicFrustum();
frustum.right = maxRadii * Cesium.Math.PI;
frustum.left = -c.frustum.right;
frustum.top = c.frustum.right * (canvas.clientHeight / canvas.clientWidth);
frustum.bottom = -c.frustum.top;
frustum.near = 0.01 * maxRadii;
frustum.far = 50.0 * maxRadii;

Members

bottom : Number
Scene/OrthographicFrustum.js 72

The bottom clipping plane.
Default Value: undefined

far : Number
Scene/OrthographicFrustum.js 88

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

left : Number
Scene/OrthographicFrustum.js 48

The left clipping plane.
Default Value: undefined

near : Number
Scene/OrthographicFrustum.js 80

The distance of the near plane.
Default Value: 1.0

readonlyprojectionMatrix : Matrix4
Scene/OrthographicFrustum.js 137

Gets the orthographic projection matrix computed from the view frustum.
The right clipping plane.
Default Value: undefined

top : Number
Scene/OrthographicFrustum.js 64

The top clipping plane.
Default Value: undefined

Methods

clone(result) → OrthographicFrustum
Scene/OrthographicFrustum.js 323

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 PerspectiveFrustum instance if one was not provided.

computeCullingVolume(position, direction, up) → CullingVolume
Scene/OrthographicFrustum.js 163

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
Scene/OrthographicFrustum.js 353

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
Scene/OrthographicFrustum.js 286

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 Cartesian2());