ClippingPlaneCollection

new Cesium.ClippingPlaneCollection(options)
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 68

Specifies a set of clipping planes. Clipping planes selectively disable rendering in a region on the outside of the specified list of ClippingPlane objects for a single gltf model, 3D Tileset, or the globe.

In general the clipping planes' coordinates are relative to the object they're attached to, so a plane with distance set to 0 will clip through the center of the object.

For 3D Tiles, the root tile's transform is used to position the clipping planes. If a transform is not defined, the root tile's Cesium3DTile#boundingSphere is used instead.

Name Type Description
options object optional Object with the following properties:
Name Type Default Description
planes Array.<ClippingPlane> [] optional An array of ClippingPlane objects used to selectively disable rendering on the outside of each plane.
enabled boolean true optional Determines whether the clipping planes are active.
modelMatrix Matrix4 Matrix4.IDENTITY optional The 4x4 transformation matrix specifying an additional transform relative to the clipping planes original coordinate system.
unionClippingRegions boolean false optional If true, a region will be clipped if it is on the outside of any plane in the collection. Otherwise, a region will only be clipped if it is on the outside of every plane.
edgeColor Color Color.WHITE optional The color applied to highlight the edge along which an object is clipped.
edgeWidth number 0.0 optional The width, in pixels, of the highlight applied to the edge along which an object is clipped.
Example:
// This clipping plane's distance is positive, which means its normal
// is facing the origin. This will clip everything that is behind
// the plane, which is anything with y coordinate < -5.
const clippingPlanes = new Cesium.ClippingPlaneCollection({
    planes : [
        new Cesium.ClippingPlane(new Cesium.Cartesian3(0.0, 1.0, 0.0), 5.0)
    ],
});
// Create an entity and attach the ClippingPlaneCollection to the model.
const entity = viewer.entities.add({
    position : Cesium.Cartesian3.fromDegrees(-123.0744619, 44.0503706, 10000),
    model : {
        uri : 'model.gltf',
        minimumPixelSize : 128,
        maximumScale : 20000,
        clippingPlanes : clippingPlanes
    }
});
viewer.zoomTo(entity);
Demo:

Members

edgeColor : Color
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 97

The color applied to highlight the edge along which an object is clipped.
Default Value: Color.WHITE

edgeWidth : number
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 105

The width, in pixels, of the highlight applied to the edge along which an object is clipped.
Default Value: 0.0

enabled : boolean
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 206

If true, clipping will be enabled.
Default Value: true

readonly length : number
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 169

Returns the number of planes in this collection. This is commonly used with ClippingPlaneCollection#get to iterate over all the planes in the collection.

modelMatrix : Matrix4
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 87

The 4x4 transformation matrix specifying an additional transform relative to the clipping planes original coordinate system.
Default Value: Matrix4.IDENTITY

planeAdded : Event
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 113

An event triggered when a new clipping plane is added to the collection. Event handlers are passed the new plane and the index at which it was added.
Default Value: Event()

planeRemoved : Event
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 121

An event triggered when a new clipping plane is removed from the collection. Event handlers are passed the new plane and the index from which it was removed.
Default Value: Event()

unionClippingRegions : boolean
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 184

If true, a region will be clipped if it is on the outside of any plane in the collection. Otherwise, a region will only be clipped if it is on the outside of every plane.
Default Value: false

Methods

add(plane)
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 285

Adds the specified ClippingPlane to the collection to be used to selectively disable rendering on the outside of each plane. Use ClippingPlaneCollection#unionClippingRegions to modify how modify the clipping behavior of multiple planes.
Name Type Description
plane ClippingPlane The ClippingPlane to add to the collection.
See:

contains(clippingPlane) → boolean
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 338

Checks whether this collection contains a ClippingPlane equal to the given ClippingPlane.
Name Type Description
clippingPlane ClippingPlane optional The ClippingPlane to check for.
Returns:
true if this collection contains the ClippingPlane, false otherwise.
See:

destroy()
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 764

Destroys the WebGL resources held by this object. Destroying an object allows for deterministic release of WebGL resources, instead of relying on the garbage collector to destroy this object.

Once an object is destroyed, it should not be used; calling any function other than isDestroyed will result in a DeveloperError exception. Therefore, assign the return value (undefined) to the object as done in the example.
Throws:
  • DeveloperError : This object was destroyed, i.e., destroy() was called.
Example:
clippingPlanes = clippingPlanes && clippingPlanes.destroy();
See:

get(index) → ClippingPlane
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 311

Returns the plane in the collection at the specified index. Indices are zero-based and increase as planes are added. Removing a plane shifts all planes after it to the left, changing their indices. This function is commonly used with ClippingPlaneCollection#length to iterate over all the planes in the collection.
Name Type Description
index number The zero-based index of the plane.
Returns:
The ClippingPlane at the specified index.
See:

isDestroyed() → boolean
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 744

Returns true if this object was destroyed; otherwise, false.

If this object was destroyed, it should not be used; calling any function other than isDestroyed will result in a DeveloperError exception.
Returns:
true if this object was destroyed; otherwise, false.
See:

remove(clippingPlane) → boolean
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 352

Removes the first occurrence of the given ClippingPlane from the collection.
Name Type Description
clippingPlane ClippingPlane
Returns:
true if the plane was removed; false if the plane was not found in the collection.
See:

removeAll()
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 391

Removes all planes from the collection.
See:

update()
@cesium/engine/Source/Scene/ClippingPlaneCollection.js 472

Called when Viewer or CesiumWidget render the scene to build the resources for clipping planes.

Do not call this function directly.

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