cesium/CHANGES.md

CesiumJS is a JavaScript library for creating 3D globes and 2D maps in a web browser without a plugin.

# Change Log

### 1.78 - 2021-02-01

##### Additions :tada:

- Added `BillboardCollection.show`, `EntityCluster.show`, `LabelCollection.show`, `PointPrimitiveCollection.show`, and `PolylineCollection.show` for a convenient way to control show of the entire collection [#9307](https://github.com/CesiumGS/cesium/pull/9307)
- `TaskProcessor` now accepts an absolute URL in addition to a worker name as it's first parameter. This makes it possible to use custom web workers with Cesium's task processing system without copying them to Cesium's Workers directory. [#9338](https://github.com/CesiumGS/cesium/pull/9338)
- Added `Cartesian2.cross` which computes the magnitude of the cross product of two vectors whose Z values are implicitly 0. [#9305](https://github.com/CesiumGS/cesium/pull/9305)
- Added `Math.previousPowerOfTwo`. [#9310](https://github.com/CesiumGS/cesium/pull/9310)

##### Fixes :wrench:

- Fixed an issue with `Math.mod` introducing a small amount of floating point error even when the input did not need to be altered. [#9354](https://github.com/CesiumGS/cesium/pull/9354)

##### Deprecated :hourglass_flowing_sand:

- `Cesium3DTileset.url` has been deprecated and will be removed in Cesium 1.79. Instead, use `Cesium3DTileset.resource.url` to retrieve the url value.

### 1.77 - 2021-01-04

##### Additions :tada:

- Added `ElevationBand` material, which maps colors and gradients to exact elevations. [#9132](https://github.com/CesiumGS/cesium/pull/9132)

##### Fixes :wrench:

- Fixed an issue where changing a model or tileset's `color`, `backFaceCulling`, or `silhouetteSize` would trigger an error. [#9271](https://github.com/CesiumGS/cesium/pull/9271)

##### Deprecated :hourglass_flowing_sand:

- `EasingFunction.QUADRACTIC_IN` was deprecated and will be removed in Cesium 1.79. It has been replaced with `EasingFunction.QUADRATIC_IN`. [#9220](https://github.com/CesiumGS/cesium/issues/9220)
- `EasingFunction.QUADRACTIC_OUT` was deprecated and will be removed in Cesium 1.79. It has been replaced with `EasingFunction.QUADRATIC_OUT`. [#9220](https://github.com/CesiumGS/cesium/issues/9220)
- `EasingFunction.QUADRACTIC_IN_OUT` was deprecated and will be removed in Cesium 1.79. It has been replaced with `EasingFunction.QUADRATIC_IN_OUT`. [#9220](https://github.com/CesiumGS/cesium/issues/9220)

### 1.76 - 2020-12-01

##### Fixes :wrench:

- Fixed an issue where tileset styles would be reapplied every frame when a tileset has a style and `tileset.preloadWhenHidden` is true and `tileset.show` is false. Also fixed a related issue where styles would be reapplied if the style being set is the same as the active style. [#9223](https://github.com/CesiumGS/cesium/pull/9223)
- Fixed JSDoc and TypeScript type definitions for `EllipsoidTangentPlane.fromPoints` which didn't list a return type. [#9227](https://github.com/CesiumGS/cesium/pull/9227)
- Updated DOMPurify from 1.0.8 to 2.2.2. [#9240](https://github.com/CesiumGS/cesium/issues/9240)

### 1.75 - 2020-11-02

##### Fixes :wrench:

- Fixed an issue in the PBR material where models with the `KHR_materials_unlit` extension had the normal attribute disabled. [#9173](https://github.com/CesiumGS/cesium/pull/9173).
- Fixed JSDoc and TypeScript type definitions for `writeTextToCanvas` which listed incorrect return type. [#9196](https://github.com/CesiumGS/cesium/pull/9196)
- Fixed JSDoc and TypeScript type definitions for `Viewer.globe` constructor option to allow disabling the globe on startup. [#9063](https://github.com/CesiumGS/cesium/pull/9063)

### 1.74 - 2020-10-01

##### Additions :tada:

- Added `Matrix3.inverseTranspose` and `Matrix4.inverseTranspose`. [#9135](https://github.com/CesiumGS/cesium/pull/9135)

##### Fixes :wrench:

- Fixed an issue where the camera zooming is stuck when looking up. [#9126](https://github.com/CesiumGS/cesium/pull/9126)
- Fixed an issue where Plane doesn't rotate correctly around the main local axis. [#8268](https://github.com/CesiumGS/cesium/issues/8268)
- Fixed clipping planes with non-uniform scale. [#9135](https://github.com/CesiumGS/cesium/pull/9135)
- Fixed an issue where ground primitives would get clipped at certain camera angles. [#9114](https://github.com/CesiumGS/cesium/issues/9114)
- Fixed a bug that could cause half of the globe to disappear when setting the `terrainProvider. [#9161](https://github.com/CesiumGS/cesium/pull/9161)
- Fixed a crash when loading Cesium OSM buildings with shadows enabled. [#9172](https://github.com/CesiumGS/cesium/pull/9172)

### 1.73 - 2020-09-01

##### Breaking Changes :mega:

- Removed `MapboxApi`, which was deprecated in v1.72. Pass your access token directly to the `MapboxImageryProvider` or `MapboxStyleImageryProvider` constructors.
- Removed `BingMapsApi`, which was deprecated in v1.72. Pass your access key directly to the `BingMapsImageryProvider` or `BingMapsGeocoderService` constructors.

##### Additions :tada:

- Added support for the CSS `line-height` specifier in the `font` property of a `Label`. [#8954](https://github.com/CesiumGS/cesium/pull/8954)
- `Viewer` now has default pick handling for `Cesium3DTileFeature` data and will display its properties in the default Viewer `InfoBox` as well as set `Viewer.selectedEntity` to a transient Entity instance representing the data. [#9121](https://github.com/CesiumGS/cesium/pull/9121).

##### Fixes :wrench:

- Fixed several artifacts on mobile devices caused by using insufficient precision. [#9064](https://github.com/CesiumGS/cesium/pull/9064)
- Fixed handling of `data:` scheme for the Cesium ion logo URL. [#9085](https://github.com/CesiumGS/cesium/pull/9085)
- Fixed an issue where the boundary rectangles in `TileAvailability` are not sorted correctly, causing terrain to sometimes fail to achieve its maximum detail. [#9098](https://github.com/CesiumGS/cesium/pull/9098)
- Fixed an issue where a request for an availability tile of the reference layer is delayed because the throttle option is on. [#9099](https://github.com/CesiumGS/cesium/pull/9099)
- Fixed an issue where Node.js tooling could not resolve package.json. [#9105](https://github.com/CesiumGS/cesium/pull/9105)
- Fixed classification artifacts on some mobile devices. [#9108](https://github.com/CesiumGS/cesium/pull/9108)
- Fixed an issue where Resource silently fails to load if being used multiple times. [#9093](https://github.com/CesiumGS/cesium/issues/9093)

### 1.72 - 2020-08-03

##### Breaking Changes :mega:

- CesiumJS no longer ships with a default Mapbox access token and Mapbox imagery layers have been removed from the `BaseLayerPicker` defaults. If you are using `MapboxImageryProvider` or `MapboxStyleImageryProvider`, use `options.accessToken` when initializing the imagery provider.

##### Additions :tada:

- Added support for glTF multi-texturing via `TEXCOORD_1`. [#9075](https://github.com/CesiumGS/cesium/pull/9075)

##### Deprecated :hourglass_flowing_sand:

- `MapboxApi.defaultAccessToken` was deprecated and will be removed in CesiumJS 1.73. Pass your access token directly to the MapboxImageryProvider or MapboxStyleImageryProvider constructors.
- `BingMapsApi` was deprecated and will be removed in CesiumJS 1.73. Pass your access key directly to the BingMapsImageryProvider or BingMapsGeocoderService constructors.

##### Fixes :wrench:

- Fixed `Color.fromCssColorString` when color string contains spaces. [#9015](https://github.com/CesiumGS/cesium/issues/9015)
- Fixed 3D Tileset replacement refinement when leaf is empty. [#8996](https://github.com/CesiumGS/cesium/pull/8996)
- Fixed a bug in the assessment of terrain tile visibility [#9033](https://github.com/CesiumGS/cesium/issues/9033)
- Fixed vertical polylines with `arcType: ArcType.RHUMB`, including lines drawn via GeoJSON. [#9028](https://github.com/CesiumGS/cesium/pull/9028)
- Fixed wall rendering when underground [#9041](https://github.com/CesiumGS/cesium/pull/9041)
- Fixed issue where a side of the wall was missing if the first position and the last position were equal [#9044](https://github.com/CesiumGS/cesium/pull/9044)
- Fixed `translucencyByDistance` for label outline color [#9003](https://github.com/CesiumGS/cesium/pull/9003)
- Fixed return value for `SampledPositionProperty.removeSample` [#9017](https://github.com/CesiumGS/cesium/pull/9017)
- Fixed issue where wall doesn't have correct texture coordinates when there are duplicate positions input [#9042](https://github.com/CesiumGS/cesium/issues/9042)
- Fixed an issue where clipping planes would not clip at the correct distances on some Android devices, most commonly reproducible on devices with `Mali` GPUs that do not support float textures via WebGL [#9023](https://github.com/CesiumGS/cesium/issues/9023)

### 1.71 - 2020-07-01

##### Breaking Changes :mega:

- Updated `WallGeometry` to respect the order of positions passed in, instead of making the positions respect a counter clockwise winding order. This will only affect the look of walls with an image material. If this changed the way your wall is drawing, reverse the order of the positions. [#8955](https://github.com/CesiumGS/cesium/pull/8955/)

##### Additions :tada:

- Added `backFaceCulling` property to `Cesium3DTileset` and `Model` to support viewing the underside or interior of a tileset or model. [#8981](https://github.com/CesiumGS/cesium/pull/8981)
- Added `Ellipsoid.surfaceArea` for computing the approximate surface area of a rectangle on the surface of an ellipsoid. [#8986](https://github.com/CesiumGS/cesium/pull/8986)
- Added support for PolylineVolume in CZML. [#8841](https://github.com/CesiumGS/cesium/pull/8841)
- Added `Color.toCssHexString` for getting the CSS hex string equivalent for a color. [#8987](https://github.com/CesiumGS/cesium/pull/8987)

##### Fixes :wrench:

- Fixed issue where tileset was not playing glTF animations. [#8962](https://github.com/CesiumGS/cesium/issues/8962)
- Fixed a divide-by-zero bug in `Ellipsoid.geodeticSurfaceNormal` when given the origin as input. `undefined` is returned instead. [#8986](https://github.com/CesiumGS/cesium/pull/8986)
- Fixed error with `WallGeometry` when there were adjacent positions with very close values. [#8952](https://github.com/CesiumGS/cesium/pull/8952)
- Fixed artifact for skinned model when log depth is enabled. [#6447](https://github.com/CesiumGS/cesium/issues/6447)
- Fixed a bug where certain rhumb arc polylines would lead to a crash. [#8787](https://github.com/CesiumGS/cesium/pull/8787)
- Fixed handling of Label's backgroundColor and backgroundPadding option [#8949](https://github.com/CesiumGS/cesium/pull/8949)
- Fixed several bugs when rendering CesiumJS in a WebGL 2 context. [#797](https://github.com/CesiumGS/cesium/issues/797)
- Fixed a bug where switching from perspective to orthographic caused triangles to overlap each other incorrectly. [#8346](https://github.com/CesiumGS/cesium/issues/8346)
- Fixed a bug where switching to orthographic camera on the first frame caused the zoom level to be incorrect. [#8853](https://github.com/CesiumGS/cesium/pull/8853)
- Fixed `scene.pickFromRay` intersection inaccuracies. [#8439](https://github.com/CesiumGS/cesium/issues/8439)
- Fixed a bug where a null or undefined name property passed to the `Entity` constructor would throw an exception.[#8832](https://github.com/CesiumGS/cesium/pull/8832)
- Fixed JSDoc and TypeScript type definitions for `ScreenSpaceEventHandler.getInputAction` which listed incorrect return type. [#9002](https://github.com/CesiumGS/cesium/pull/9002)
- Improved the style of the error panel. [#8739](https://github.com/CesiumGS/cesium/issues/8739)
- Fixed animation widget SVG icons not appearing in iOS 13.5.1. [#8993](https://github.com/CesiumGS/cesium/pull/8993)

### 1.70.1 - 2020-06-10

##### Additions :tada:

- Add a `toString` method to the `Resource` class in case an instance gets logged as a string. [#8722](https://github.com/CesiumGS/cesium/issues/8722)
- Exposed `Transforms.rotationMatrixFromPositionVelocity` method from Cesium's private API. [#8927](https://github.com/CesiumGS/cesium/issues/8927)

##### Fixes :wrench:

- Fixed JSDoc and TypeScript type definitions for all `ImageryProvider` types, which were missing `defaultNightAlpha` and `defaultDayAlpha` properties. [#8908](https://github.com/CesiumGS/cesium/pull/8908)
- Fixed JSDoc and TypeScript for `MaterialProperty`, which were missing the ability to take primitive types in their constructor. [#8904](https://github.com/CesiumGS/cesium/pull/8904)
- Fixed JSDoc and TypeScript type definitions to allow the creation of `GeometryInstance` instances using `XXXGeometry` classes. [#8941](https://github.com/CesiumGS/cesium/pull/8941).
- Fixed JSDoc and TypeScript for `buildModuleUrl`, which was accidentally excluded from the official CesiumJS API. [#8923](https://github.com/CesiumGS/cesium/pull/8923)
- Fixed JSDoc and TypeScript type definitions for `EllipsoidGeodesic` which incorrectly listed `result` as required. [#8904](https://github.com/CesiumGS/cesium/pull/8904)
- Fixed JSDoc and TypeScript type definitions for `EllipsoidTangentPlane.fromPoints`, which takes an array of `Cartesian3`, not a single instance. [#8928](https://github.com/CesiumGS/cesium/pull/8928)
- Fixed JSDoc and TypeScript type definitions for `EntityCollection.getById` and `CompositeEntityCollection.getById`, which can both return undefined. [#8928](https://github.com/CesiumGS/cesium/pull/8928)
- Fixed JSDoc and TypeScript type definitions for `Viewer` options parameters.
- Fixed a memory leak where some 3D Tiles requests were being unintentionally retained after the requests were cancelled. [#8843](https://github.com/CesiumGS/cesium/pull/8843)
- Fixed a bug with handling of PixelFormat's flipY. [#8893](https://github.com/CesiumGS/cesium/pull/8893)

### 1.70.0 - 2020-06-01

##### Major Announcements :loudspeaker:

- All Cesium ion users now have access to Cesium OSM Buildings - a 3D buildings layer covering the entire world built with OpenStreetMap building data, available as 3D Tiles. Read more about it [on our blog](https://cesium.com/blog/2020/06/01/cesium-osm-buildings/).
  - [Explore it on Sandcastle](https://sandcastle.cesium.com/index.html?src=Cesium%20OSM%20Buildings.html).
  - Add it to your CesiumJS app: `viewer.scene.primitives.add(Cesium.createOsmBuildings())`.
  - Contains per-feature data like building name, address, and much more. [Read more about the available properties](https://cesium.com/content/cesium-osm-buildings/).
- CesiumJS now ships with official TypeScript type definitions! [#8878](https://github.com/CesiumGS/cesium/pull/8878)
  - If you import CesiumJS as a module, the new definitions will automatically be used by TypeScript and related tooling.
  - If you import individual CesiumJS source files directly, you'll need to add `"types": ["cesium"]` in your tsconfig.json in order for the definitions to be used.
  - If you’re using your own custom definitions and you’re not yet ready to switch, you can delete `Source/Cesium.d.ts` after install.
  - See our [blog post](https://cesium.com/blog/2020/06/01/cesiumjs-tsd/) for more information and a technical overview of how it all works.
- CesiumJS now supports underground rendering with globe translucency! [#8726](https://github.com/CesiumGS/cesium/pull/8726)
  - Added options for controlling globe translucency through the new [`GlobeTranslucency`](https://cesium.com/docs/cesiumjs-ref-doc/GlobeTranslucency.html) object including front face alpha, back face alpha, and a translucency rectangle.
  - Added `Globe.undergroundColor` and `Globe.undergroundColorAlphaByDistance` for controlling how the back side of the globe is rendered when the camera is underground or the globe is translucent. [#8867](https://github.com/CesiumGS/cesium/pull/8867)
  - Improved camera controls when the camera is underground. [#8811](https://github.com/CesiumGS/cesium/pull/8811)
  - Sandcastle examples: [Globe Translucency](https://sandcastle.cesium.com/?src=Globe%20Translucency.html), [Globe Interior](https://sandcastle.cesium.com/?src=Globe%20Interior.html), and [Underground Color](https://sandcastle.cesium.com/?src=Underground%20Color.html&label=All)

##### Additions :tada:

- Our API reference documentation has received dozens of fixes and improvements, largely due to the TypeScript effort.
- Added `Cesium3DTileset.extensions` to get the extensions property from the tileset JSON. [#8829](https://github.com/CesiumGS/cesium/pull/8829)
- Added `Camera.completeFlight`, which causes the current camera flight to immediately jump to the final destination and call its complete callback. [#8788](https://github.com/CesiumGS/cesium/pull/8788)
- Added `nightAlpha` and `dayAlpha` properties to `ImageryLayer` to control alpha separately for the night and day sides of the globe. [#8868](https://github.com/CesiumGS/cesium/pull/8868)
- Added `SkyAtmosphere.perFragmentAtmosphere` to switch between per-vertex and per-fragment atmosphere shading. [#8866](https://github.com/CesiumGS/cesium/pull/8866)
- Added a new sandcastle example to show how to add fog using a `PostProcessStage` [#8798](https://github.com/CesiumGS/cesium/pull/8798)
- Added `frustumSplits` option to `DebugCameraPrimitive`. [8849](https://github.com/CesiumGS/cesium/pull/8849)
- Supported `#rgba` and `#rrggbbaa` formats in `Color.fromCssColorString`. [8873](https://github.com/CesiumGS/cesium/pull/8873)

##### Fixes :wrench:

- Fixed a bug that could cause rendering of a glTF model to become corrupt when switching from a Uint16 to a Uint32 index buffer to accomodate new vertices added for edge outlining. [#8820](https://github.com/CesiumGS/cesium/pull/8820)
- Fixed a bug where a removed billboard could prevent changing of the `TerrainProvider`. [#8766](https://github.com/CesiumGS/cesium/pull/8766)
- Fixed an issue with 3D Tiles point cloud styling where `${feature.propertyName}` and `${feature["propertyName"]}` syntax would cause a crash. Also fixed an issue where property names with non-alphanumeric characters would crash. [#8785](https://github.com/CesiumGS/cesium/pull/8785)
- Fixed a bug where `DebugCameraPrimitive` was ignoring the near and far planes of the `Camera`. [#8848](https://github.com/CesiumGS/cesium/issues/8848)
- Fixed sky atmosphere artifacts below the horizon. [#8866](https://github.com/CesiumGS/cesium/pull/8866)
- Fixed ground primitives in orthographic mode. [#5110](https://github.com/CesiumGS/cesium/issues/5110)
- Fixed the depth plane in orthographic mode. This improves the quality of polylines and other primitives that are rendered near the horizon. [8858](https://github.com/CesiumGS/cesium/pull/8858)

### 1.69.0 - 2020-05-01

##### Breaking Changes :mega:

- The property `Scene.sunColor` has been removed. Use `scene.light.color` and `scene.light.intensity` instead. [#8774](https://github.com/CesiumGS/cesium/pull/8774)
- Removed `isArray`. Use the native `Array.isArray` function instead. [#8779](https://github.com/CesiumGS/cesium/pull/8779)

##### Additions :tada:

- Added `RequestScheduler` to the public API; this allows users to have more control over the requests made by CesiumJS. [#8384](https://github.com/CesiumGS/cesium/issues/8384)
- Added support for high-quality edges on solid geometry in glTF models. [#8776](https://github.com/CesiumGS/cesium/pull/8776)
- Added `Scene.cameraUnderground` for checking whether the camera is underneath the globe. [#8765](https://github.com/CesiumGS/cesium/pull/8765)

##### Fixes :wrench:

- Fixed several problems with polylines when the logarithmic depth buffer is enabled, which is the default on most systems. [#8706](https://github.com/CesiumGS/cesium/pull/8706)
- Fixed a bug with very long view ranges requiring multiple frustums even with the logarithmic depth buffer enabled. Previously, such scenes could resolve depth incorrectly. [#8727](https://github.com/CesiumGS/cesium/pull/8727)
- Fixed an issue with glTF skinning support where an optional property `skeleton` was considered required by Cesium. [#8175](https://github.com/CesiumGS/cesium/issues/8175)
- Fixed an issue with clamping of non-looped glTF animations. Subscribers to animation `update` events should expect one additional event firing as an animation stops. [#7387](https://github.com/CesiumGS/cesium/issues/7387)
- Geometry instance floats now work for high precision floats on newer iOS devices. [#8805](https://github.com/CesiumGS/cesium/pull/8805)
- Fixed a bug where the elevation contour material's alpha was not being applied. [#8749](https://github.com/CesiumGS/cesium/pull/8749)
- Fix potential memory leak when destroying `CesiumWidget` instances. [#8591](https://github.com/CesiumGS/cesium/pull/8591)
- Fixed displaying the Cesium ion icon when running in an Android, iOS or UWP WebView. [#8758](https://github.com/CesiumGS/cesium/pull/8758)

### 1.68.0 - 2020-04-01

##### Additions :tada:

- Added basic underground rendering support. When the camera is underground the globe will be rendered as a solid surface and underground entities will not be culled. [#8572](https://github.com/AnalyticalGraphicsInc/cesium/pull/8572)
- The `CesiumUnminified` build now includes sourcemaps. [#8572](https://github.com/CesiumGS/cesium/pull/8659)
- Added glTF `STEP` animation interpolation. [#8786](https://github.com/CesiumGS/cesium/pull/8786)
- Added the ability to edit CesiumJS shaders on-the-fly using the [SpectorJS](https://spector.babylonjs.com/) Shader Editor. [#8608](https://github.com/CesiumGS/cesium/pull/8608)

##### Fixes :wrench:

- Cesium can now be used in Node.JS 12 and later, with or without `--experimental-modules`. It can still be used in earlier versions as well. [#8572](https://github.com/CesiumGS/cesium/pull/8659)
- Interacting with the Cesium canvas will now blur the previously focused element. This prevents unintended modification of input elements when interacting with the globe. [#8662](https://github.com/CesiumGS/cesium/pull/8662)
- `TileMapServiceImageryProvider` will now force `minimumLevel` to 0 if the `tilemapresource.xml` metadata request fails and the `rectangle` is too large for the given detail level [#8448](https://github.com/AnalyticalGraphicsInc/cesium/pull/8448)
- Fixed ground atmosphere rendering when using a smaller ellipsoid. [#8683](https://github.com/CesiumGS/cesium/issues/8683)
- Fixed globe incorrectly occluding objects when using a smaller ellipsoid. [#7124](https://github.com/CesiumGS/cesium/issues/7124)
- Fixed a regression introduced in 1.67 which caused overlapping colored ground geometry to have visual artifacts. [#8694](https://github.com/CesiumGS/cesium/pull/8694)
- Fixed a clipping problem when viewing a polyline up close with the logarithmic depth buffer enabled, which is the default on most systems. [#8703](https://github.com/CesiumGS/cesium/pull/8703)

### 1.67.0 - 2020-03-02

##### Breaking Changes :mega:

- `Cesium3DTileset.skipLevelOfDetail` is now `false` by default. [#8631](https://github.com/CesiumGS/cesium/pull/8631)
- glTF models are now rendered using the `LEQUALS` depth test function instead of `LESS`. This means that when geometry overlaps, the _later_ geometry will be visible above the earlier, where previously the opposite was true. We believe this is a more sensible default, and makes it easier to render e.g. outlined buildings with glTF. [#8646](https://github.com/CesiumGS/cesium/pull/8646)

##### Additions :tada:

- Massively improved performance of clamped Entity ground geometry with dynamic colors. [#8630](https://github.com/CesiumGS/cesium/pull/8630)
- Added `Entity.tileset` for loading a 3D Tiles tileset via the Entity API using the new `Cesium3DTilesetGraphics` class. [#8580](https://github.com/CesiumGS/cesium/pull/8580)
- Added `tileset.uri`, `tileset.show`, and `tileset.maximumScreenSpaceError` properties to CZML processing for loading 3D Tiles. [#8580](https://github.com/CesiumGS/cesium/pull/8580)
- Added `Color.lerp` for linearly interpolating between two RGB colors. [#8607](https://github.com/CesiumGS/cesium/pull/8607)
- `CesiumTerrainProvider` now supports terrain tiles using a `WebMercatorTilingScheme` by specifying `"projection": "EPSG:3857"` in `layer.json`. It also now supports numbering tiles from the North instead of the South by specifying `"scheme": "slippyMap"` in `layer.json`. [#8563](https://github.com/CesiumGS/cesium/pull/8563)
- Added basic support for `isNaN`, `isFinite`, `null`, and `undefined` in the 3D Tiles styling GLSL backend for point clouds. [#8621](https://github.com/CesiumGS/cesium/pull/8621)
- Added `sizeInMeters` to `ParticleSystem`. [#7746](https://github.com/CesiumGS/cesium/pull/7746)

##### Fixes :wrench:

- Fixed a bug that caused large, nearby geometry to be clipped when using a logarithmic depth buffer, which is the default on most systems. [#8600](https://github.com/CesiumGS/cesium/pull/8600)
- Fixed a bug where tiles would not load if the camera was tracking a moving tileset. [#8598](https://github.com/CesiumGS/cesium/pull/8598)
- Fixed a bug where applying a new 3D Tiles style during a flight would not update all existing tiles. [#8622](https://github.com/CesiumGS/cesium/pull/8622)
- Fixed a bug where Cartesian vectors could not be packed to typed arrays [#8568](https://github.com/CesiumGS/cesium/pull/8568)
- Updated knockout from 3.5.0 to 3.5.1. [#8424](https://github.com/CesiumGS/cesium/pull/8424)
- Cesium's local development server now works in Node 12 & 13 [#8648](https://github.com/CesiumGS/cesium/pull/8648)

##### Deprecated :hourglass_flowing_sand:

- The `isArray` function has been deprecated and will be removed in Cesium 1.69. Use the native `Array.isArray` function instead. [#8526](https://github.com/CesiumGS/cesium/pull/8526)

### 1.66.0 - 2020-02-03

##### Deprecated :hourglass_flowing_sand:

- The property `Scene.sunColor` has been deprecated and will be removed in Cesium 1.69. Use `scene.light.color` and `scene.light.intensity` instead. [#8493](https://github.com/CesiumGS/cesium/pull/8493)

##### Additions :tada:

- `useBrowserRecommendedResolution` flag in `Viewer` and `CesiumWidget` now defaults to `true`. This ensures Cesium rendering is fast and smooth by default across all devices. Set it to `false` to always render at native device resolution instead at the cost of performance on under-powered devices. [#8548](https://github.com/CesiumGS/cesium/pull/8548)
- Cesium now creates a WebGL context with a `powerPreference` value of `high-performance`. Some browsers use this setting to enable a second, more powerful, GPU. You can set it back to `default`, or opt-in to `low-power` mode, by passing the context option when creating a `Viewer` or `CesiumWidget` instance:

```js
var viewer = new Viewer("cesiumContainer", {
  contextOptions: {
    webgl: {
      powerPreference: "default",
    },
  },
});
```

- Added more customization to Cesium's lighting system. [#8493](https://github.com/CesiumGS/cesium/pull/8493)
  - Added `Light`, `DirectionalLight`, and `SunLight` classes for creating custom light sources.
  - Added `Scene.light` for setting the scene's light source, which defaults to a `SunLight`.
  - Added `Globe.dynamicAtmosphereLighting` for enabling lighting effects on atmosphere and fog, such as day/night transitions. It is true by default but may be set to false if the atmosphere should stay unchanged regardless of the scene's light direction.
  - Added `Globe.dynamicAtmosphereLightingFromSun` for using the sun direction instead of the scene's light direction when `Globe.dynamicAtmosphereLighting` is enabled. See the moonlight example in the [Lighting Sandcastle example](https://cesiumjs.org/Cesium/Apps/Sandcastle/?src=Lighting.html).
  - Primitives and the globe are now shaded with the scene light's color.
- Updated SampleData models to glTF 2.0. [#7802](https://github.com/CesiumGS/cesium/issues/7802)
- Added `Globe.showSkirts` to support the ability to hide terrain skirts when viewing terrain from below the surface. [#8489](https://github.com/CesiumGS/cesium/pull/8489)
- Added `minificationFilter` and `magnificationFilter` options to `Material` to control texture filtering. [#8473](https://github.com/CesiumGS/cesium/pull/8473)
- Updated [earcut](https://github.com/mapbox/earcut) to 2.2.1. [#8528](https://github.com/CesiumGS/cesium/pull/8528)
- Added a font cache to improve label performance. [#8537](https://github.com/CesiumGS/cesium/pull/8537)

##### Fixes :wrench:

- Fixed a bug where the camera could go underground during mouse navigation. [#8504](https://github.com/CesiumGS/cesium/pull/8504)
- Fixed a bug where rapidly updating a `PolylineCollection` could result in an `instanceIndex` is out of range error. [#8546](https://github.com/CesiumGS/cesium/pull/8546)
- Fixed issue where `RequestScheduler` double-counted image requests made via `createImageBitmap`. [#8162](https://github.com/CesiumGS/cesium/issues/8162)
- Reduced Cesium bundle size by avoiding unnecessarily importing `Cesium3DTileset` in `Picking.js`. [#8532](https://github.com/CesiumGS/cesium/pull/8532)
- Fixed a bug where files with backslashes were not loaded in KMZ files. [#8533](https://github.com/CesiumGS/cesium/pull/8533)
- Fixed WebGL warning message about `EXT_float_blend` being implicitly enabled. [#8534](https://github.com/CesiumGS/cesium/pull/8534)
- Fixed a bug where toggling point cloud classification visibility would result in a grey screen on Linux / Nvidia. [#8538](https://github.com/CesiumGS/cesium/pull/8538)
- Fixed a bug where a point in a `PointPrimitiveCollection` was rendered in the middle of the screen instead of being clipped. [#8542](https://github.com/CesiumGS/cesium/pull/8542)
- Fixed a crash when deleting and re-creating polylines from CZML. `ReferenceProperty` now returns undefined when the target entity or property does not exist, instead of throwing. [#8544](https://github.com/CesiumGS/cesium/pull/8544)
- Fixed terrain tile picking in the Cesium Inspector. [#8567](https://github.com/CesiumGS/cesium/pull/8567)
- Fixed a crash that could occur when an entity was deleted while the corresponding `Primitive` was being created asynchronously. [#8569](https://github.com/CesiumGS/cesium/pull/8569)
- Fixed a crash when calling `camera.lookAt` with the origin (0, 0, 0) as the target. This could happen when looking at a tileset with the origin as its center. [#8571](https://github.com/CesiumGS/cesium/pull/8571)
- Fixed a bug where `camera.viewBoundingSphere` was modifying the `offset` parameter. [#8438](https://github.com/CesiumGS/cesium/pull/8438)
- Fixed a crash when creating a plane with both position and normal on the Z-axis. [#8576](https://github.com/CesiumGS/cesium/pull/8576)
- Fixed `BoundingSphere.projectTo2D` when the bounding sphere’s center is at the origin. [#8482](https://github.com/CesiumGS/cesium/pull/8482)

### 1.65.0 - 2020-01-06

##### Breaking Changes :mega:

- `OrthographicFrustum.getPixelDimensions`, `OrthographicOffCenterFrustum.getPixelDimensions`, `PerspectiveFrustum.getPixelDimensions`, and `PerspectiveOffCenterFrustum.getPixelDimensions` now require a `pixelRatio` argument before the `result` argument. The previous function definition has been deprecated since 1.63. [#8320](https://github.com/CesiumGS/cesium/pull/8320)
- The function `Matrix4.getRotation` has been renamed to `Matrix4.getMatrix3`. `Matrix4.getRotation` has been deprecated since 1.62. [#8183](https://github.com/CesiumGS/cesium/pull/8183)
- `createTileMapServiceImageryProvider` and `createOpenStreetMapImageryProvider` have been removed. Instead, pass the same options to `new TileMapServiceImageryProvider` and `new OpenStreetMapImageryProvider` respectively. The old functions have been deprecated since 1.62. [#8174](https://github.com/CesiumGS/cesium/pull/8174)

##### Additions :tada:

- Added `Globe.backFaceCulling` to support viewing terrain from below the surface. [#8470](https://github.com/CesiumGS/cesium/pull/8470)

##### Fixes :wrench:

- Fixed Geocoder auto-complete suggestions when hosted inside Web Components. [#8425](https://github.com/CesiumGS/cesium/pull/8425)
- Fixed terrain tile culling problems when under ellipsoid. [#8397](https://github.com/CesiumGS/cesium/pull/8397)
- Fixed primitive culling when below the ellipsoid but above terrain. [#8398](https://github.com/CesiumGS/cesium/pull/8398)
- Improved the translucency calculation for the Water material type. [#8455](https://github.com/CesiumGS/cesium/pull/8455)
- Fixed bounding volume calculation for `GroundPrimitive`. [#4883](https://github.com/CesiumGS/cesium/issues/4483)
- Fixed `OrientedBoundingBox.fromRectangle` for rectangles with width greater than 180 degrees. [#8475](https://github.com/CesiumGS/cesium/pull/8475)
- Fixed globe picking so that it returns the closest intersecting triangle instead of the first intersecting triangle. [#8390](https://github.com/CesiumGS/cesium/pull/8390)
- Fixed horizon culling issues with large root tiles. [#8487](https://github.com/CesiumGS/cesium/pull/8487)
- Fixed a lighting bug affecting Macs with Intel integrated graphics where glTF 2.0 PBR models with double sided materials would have flipped normals. [#8494](https://github.com/CesiumGS/cesium/pull/8494)

### 1.64.0 - 2019-12-02

##### Fixes :wrench:

- Fixed an issue in image based lighting where an invalid environment map would silently fail. [#8303](https://github.com/CesiumGS/cesium/pull/8303)
- Various small internal improvements

### 1.63.1 - 2019-11-06

##### Fixes :wrench:

- Fixed regression in 1.63 where ground atmosphere and labels rendered incorrectly on displays with `window.devicePixelRatio` greater than 1.0. [#8351](https://github.com/CesiumGS/cesium/pull/8351)
- Fixed regression in 1.63 where some primitives would show through the globe when log depth is disabled. [#8368](https://github.com/CesiumGS/cesium/pull/8368)

### 1.63 - 2019-11-01

##### Major Announcements :loudspeaker:

- Cesium has migrated to ES6 modules. This may or may not be a breaking change for your application depending on how you use Cesium. See our [blog post](https://cesium.com/blog/2019/10/31/cesiumjs-es6/) for the full details.
- We’ve consolidated all of our website content from cesiumjs.org and cesium.com into one home on cesium.com. Here’s where you can now find:
  - [Sandcastle](https://sandcastle.cesium.com) - `https://sandcastle.cesium.com`
  - [API Docs](https://cesium.com/docs/cesiumjs-ref-doc/) - `https://cesium.com/docs/cesiumjs-ref-doc/`
  - [Downloads](https://cesium.com/downloads/) - `https://cesium.com/downloads/`
  - Hosted releases can be found at `https://cesium.com/downloads/cesiumjs/releases/<CesiumJS Version Number>/Build/Cesium/Cesium.js`
  - See our [blog post](https://cesium.com/blog/2019/10/15/cesiumjs-migration/) for more information.

##### Additions :tada:

- Decreased Web Workers bundle size by a factor of 10, from 8384KB (2624KB gzipped) to 863KB (225KB gzipped). This makes Cesium load faster, especially on low-end devices and slower network connections.
- Added full UTF-8 support to labels, greatly improving support for non-latin alphabets and emoji. [#7280](https://github.com/CesiumGS/cesium/pull/7280)
- Added `"type": "module"` to package.json to take advantage of native ES6 module support in newer versions of Node.js. This also enables module-based front-end development for tooling that relies on Node.js module resolution.
- The combined `Build/Cesium/Cesium.js` and `Build/CesiumUnminified/Cesium.js` have been upgraded from IIFE to UMD modules that support IIFE, AMD, and commonjs.
- Added `pixelRatio` parameter to `OrthographicFrustum.getPixelDimensions`, `OrthographicOffCenterFrustum.getPixelDimensions`, `PerspectiveFrustum.getPixelDimensions`, and `PerspectiveOffCenterFrustum.getPixelDimensions`. Pass in `scene.pixelRatio` for dimensions in CSS pixel units or `1.0` for dimensions in native device pixel units. [#8237](https://github.com/CesiumGS/cesium/pull/8237)

##### Fixes :wrench:

- Fixed css pixel usage for polylines, point clouds, models, primitives, and post-processing. [#8113](https://github.com/CesiumGS/cesium/issues/8113)
- Fixed a bug where `scene.sampleHeightMostDetailed` and `scene.clampToHeightMostDetailed` would not resolve in request render mode. [#8281](https://github.com/CesiumGS/cesium/issues/8281)
- Fixed seam artifacts when log depth is disabled, `scene.globe.depthTestAgainstTerrain` is false, and primitives are under the globe. [#8205](https://github.com/CesiumGS/cesium/pull/8205)
- Fix dynamic ellipsoids using `innerRadii`, `minimumClock`, `maximumClock`, `minimumCone` or `maximumCone`. [#8277](https://github.com/CesiumGS/cesium/pull/8277)
- Fixed rendering billboard collections containing more than 65536 billboards. [#8325](https://github.com/CesiumGS/cesium/pull/8325)

##### Deprecated :hourglass_flowing_sand:

- `OrthographicFrustum.getPixelDimensions`, `OrthographicOffCenterFrustum.getPixelDimensions`, `PerspectiveFrustum.getPixelDimensions`, and `PerspectiveOffCenterFrustum.getPixelDimensions` now take a `pixelRatio` argument before the `result` argument. The previous function definition will no longer work in 1.65. [#8237](https://github.com/CesiumGS/cesium/pull/8237)

### 1.62 - 2019-10-01

##### Deprecated :hourglass_flowing_sand:

- `createTileMapServiceImageryProvider` and `createOpenStreetMapImageryProvider` have been deprecated and will be removed in Cesium 1.65. Instead, pass the same options to `new TileMapServiceImageryProvider` and `new OpenStreetMapImageryProvider` respectively.
- The function `Matrix4.getRotation` has been deprecated and renamed to `Matrix4.getMatrix3`. `Matrix4.getRotation` will be removed in version 1.65.

##### Additions :tada:

- Added ability to create partial ellipsoids using both the Entity API and CZML. New ellipsoid geometry properties: `innerRadii`, `minimumClock`, `maximumClock`, `minimumCone`, and `maximumCone`. This affects both `EllipsoidGeometry` and `EllipsoidOutlineGeometry`. See the updated [Sandcastle example](https://cesiumjs.org/Cesium/Apps/Sandcastle/?src=Partial%20Ellipsoids.html&label=Geometries). [#5995](https://github.com/CesiumGS/cesium/pull/5995)
- Added `useBrowserRecommendedResolution` flag to `Viewer` and `CesiumWidget`. When true, Cesium renders at CSS pixel resolution instead of native device resolution. This replaces the workaround in the 1.61 change list. [8215](https://github.com/CesiumGS/cesium/issues/8215)
- Added `TileMapResourceImageryProvider` and `OpenStreetMapImageryProvider` classes to improve API consistency: [#4812](https://github.com/CesiumGS/cesium/issues/4812)
- Added `credit` parameter to `CzmlDataSource`, `GeoJsonDataSource`, `KmlDataSource` and `Model`. [#8173](https://github.com/CesiumGS/cesium/pull/8173)
- Added `Matrix3.getRotation` to get the rotational component of a matrix with scaling removed. [#8182](https://github.com/CesiumGS/cesium/pull/8182)

##### Fixes :wrench:

- Fixed labels not showing for individual entities in data sources when clustering is enabled. [#6087](https://github.com/CesiumGS/cesium/issues/6087)
- Fixed an issue where polygons, corridors, rectangles, and ellipses on terrain would not render on some mobile devices. [#6739](https://github.com/CesiumGS/cesium/issues/6739)
- Fixed a bug where GlobeSurfaceTile would not render the tile until all layers completed loading causing globe to appear to hang. [#7974](https://github.com/CesiumGS/cesium/issues/7974)
- Spread out KMl loading across multiple frames to prevent freezing. [#8195](https://github.com/CesiumGS/cesium/pull/8195)
- Fixed a bug where extruded polygons would sometimes be missing segments. [#8035](https://github.com/CesiumGS/cesium/pull/8035)
- Made pixel sizes consistent for polylines and point clouds when rendering at different pixel ratios. [#8113](https://github.com/CesiumGS/cesium/issues/8113)
- `Camera.flyTo` flies to the correct location in 2D when the destination crosses the international date line [#7909](https://github.com/CesiumGS/cesium/pull/7909)
- Fixed 3D tiles style coloring when multiple tilesets are in the scene [#8051](https://github.com/CesiumGS/cesium/pull/8051)
- 3D Tiles geometric error now correctly scales with transform. [#8182](https://github.com/CesiumGS/cesium/pull/8182)
- Fixed per-feature post processing from sometimes selecting the wrong feature. [#7929](https://github.com/CesiumGS/cesium/pull/7929)
- Fixed a bug where dynamic polylines did not use the given arcType. [#8191](https://github.com/CesiumGS/cesium/issues/8191)
- Fixed atmosphere brightness when High Dynamic Range is disabled. [#8149](https://github.com/CesiumGS/cesium/issues/8149)
- Fixed brightness levels for procedural Image Based Lighting. [#7803](https://github.com/CesiumGS/cesium/issues/7803)
- Fixed alpha equation for `BlendingState.ALPHA_BLEND` and `BlendingState.ADDITIVE_BLEND`. [#8202](https://github.com/CesiumGS/cesium/pull/8202)
- Improved display of tile coordinates for `TileCoordinatesImageryProvider` [#8131](https://github.com/CesiumGS/cesium/pull/8131)
- Reduced size of approximateTerrainHeights.json [#7959](https://github.com/CesiumGS/cesium/pull/7959)
- Fixed undefined `quadDetails` error from zooming into the map really close. [#8011](https://github.com/CesiumGS/cesium/pull/8011)
- Fixed a crash for 3D Tiles that have zero volume. [#7945](https://github.com/CesiumGS/cesium/pull/7945)
- Fixed relative-to-center check, `depthFailAppearance` resource freeing for `Primitive` [#8044](https://github.com/CesiumGS/cesium/pull/8044)

### 1.61 - 2019-09-03

##### Additions :tada:

- Added optional `index` parameter to `PrimitiveCollection.add`. [#8041](https://github.com/CesiumGS/cesium/pull/8041)
- Cesium now renders at native device resolution by default instead of CSS pixel resolution, to go back to the old behavior, set `viewer.resolutionScale = 1.0 / window.devicePixelRatio`. [#8082](https://github.com/CesiumGS/cesium/issues/8082)
- Added `getByName` method to `DataSourceCollection` allowing to retrieve `DataSource`s by their name property from the collection

##### Fixes :wrench:

- Disable FXAA by default. To re-enable, set `scene.postProcessStages.fxaa.enabled = true` [#7875](https://github.com/CesiumGS/cesium/issues/7875)
- Fixed a crash when a glTF model used `KHR_texture_transform` without a sampler defined. [#7916](https://github.com/CesiumGS/cesium/issues/7916)
- Fixed post-processing selection filtering to work for bloom. [#7984](https://github.com/CesiumGS/cesium/issues/7984)
- Disabled HDR by default to improve visual quality in most standard use cases. Set `viewer.scene.highDynamicRange = true` to re-enable. [#7966](https://github.com/CesiumGS/cesium/issues/7966)
- Fixed a bug that causes hidden point primitives to still appear on some operating systems. [#8043](https://github.com/CesiumGS/cesium/issues/8043)
- Fix negative altitude altitude handling in `GoogleEarthEnterpriseTerrainProvider`. [#8109](https://github.com/CesiumGS/cesium/pull/8109)
- Fixed issue where KTX or CRN files would not be properly identified. [#7979](https://github.com/CesiumGS/cesium/issues/7979)
- Fixed multiple globe materials making the globe darker. [#7726](https://github.com/CesiumGS/cesium/issues/7726)

### 1.60 - 2019-08-01

##### Additions :tada:

- Reworked label rendering to use signed distance fields (SDF) for crisper text. [#7730](https://github.com/CesiumGS/cesium/pull/7730)
- Added a [new Sandcastle example](https://cesiumjs.org/Cesium/Build/Apps/Sandcastle/?src=Labels%20SDF.html) to showcase the new SDF labels.
- Added support for polygon holes to CZML. [#7991](https://github.com/CesiumGS/cesium/pull/7991)
- Added `totalScale` property to `Label` which is the total scale of the label taking into account the label's scale and the relative size of the desired font compared to the generated glyph size.

##### Fixes :wrench:

- Fixed crash when using ArcGIS terrain with clipping planes. [#7998](https://github.com/CesiumGS/cesium/pull/7998)
- `PolygonGraphics.hierarchy` now converts constant array values to a `PolygonHierarchy` when set, so code that accesses the value of the property can rely on it always being a `PolygonHierarchy`.
- Fixed a bug with lengthwise texture coordinates in the first segment of ground polylines, as observed in some WebGL implementations such as Chrome on Linux. [#8017](https://github.com/CesiumGS/cesium/issues/8017)

### 1.59 - 2019-07-01

##### Additions :tada:

- Adds `ArcGISTiledElevationTerrainProvider` to support LERC encoded terrain from ArcGIS ImageServer. [#7940](https://github.com/CesiumGS/cesium/pull/7940)
- Added CZML support for `heightReference` to `box`, `cylinder`, and `ellipsoid`, and added CZML support for `classificationType` to `corridor`, `ellipse`, `polygon`, `polyline`, and `rectangle`. [#7899](https://github.com/CesiumGS/cesium/pull/7899)
- Adds `exportKML` function to export `Entity` instances with Point, Billboard, Model, Label, Polyline and Polygon graphics. [#7921](https://github.com/CesiumGS/cesium/pull/7921)
- Added support for new Mapbox Style API. [#7698](https://github.com/CesiumGS/cesium/pull/7698)
- Added support for the [AGI_articulations](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/AGI_articulations) vendor extension of glTF 2.0 to the Entity API and CZML. [#7907](https://github.com/CesiumGS/cesium/pull/7907)

##### Fixes :wrench:

- Fixed a bug that caused missing segments for ground polylines with coplanar points over large distances and problems with polylines containing duplicate points. [#7885](https://github.com/CesiumGS/cesium//pull/7885)
- Fixed a bug where billboards were not pickable when zoomed out completely in 2D View. [#7908](https://github.com/CesiumGS/cesium/pull/7908)
- Fixed a bug where image requests that returned HTTP code 204 would prevent any future request from succeeding on browsers that supported ImageBitmap. [#7914](https://github.com/CesiumGS/cesium/pull/7914/)
- Fixed polyline colors when `scene.highDynamicRange` is enabled. [#7924](https://github.com/CesiumGS/cesium/pull/7924)
- Fixed a bug in the inspector where the min/max height values of a picked tile were undefined. [#7904](https://github.com/CesiumGS/cesium/pull/7904)
- Fixed `Math.factorial` to return the correct values. (https://github.com/CesiumGS/cesium/pull/7969)
- Fixed a bug that caused 3D models to appear darker on Android devices. [#7944](https://github.com/CesiumGS/cesium/pull/7944)

### 1.58.1 - 2018-06-03

_This is an npm-only release to fix a publishing issue_.

### 1.58 - 2019-06-03

##### Additions :tada:

- Added support for new `BingMapsStyle` values `ROAD_ON_DEMAND` and `AERIAL_WITH_LABELS_ON_DEMAND`. The older versions of these, `ROAD` and `AERIAL_WITH_LABELS`, have been deprecated by Bing. [#7808](https://github.com/CesiumGS/cesium/pull/7808)
- Added syntax to delete data from existing properties via CZML. [#7818](https://github.com/CesiumGS/cesium/pull/7818)
- Added `checkerboard` material to CZML. [#7845](https://github.com/CesiumGS/cesium/pull/7845)
- `BingMapsImageryProvider` now uses `DiscardEmptyTileImagePolicy` by default to detect missing tiles as zero-length responses instead of inspecting pixel values. [#7810](https://github.com/CesiumGS/cesium/pull/7810)
- Added support for the [AGI_articulations](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/AGI_articulations) vendor extension of glTF 2.0 to the Model primitive graphics API. [#7835](https://github.com/CesiumGS/cesium/pull/7835)
- Reduce the number of Bing transactions and ion Bing sessions used when destroying and recreating the same imagery layer to 1. [#7848](https://github.com/CesiumGS/cesium/pull/7848)

##### Fixes :wrench:

- Fixed an edge case where Cesium would provide ion access token credentials to non-ion servers if the actual asset entrypoint was being hosted by ion. [#7839](https://github.com/CesiumGS/cesium/pull/7839)
- Fixed a bug that caused Cesium to request non-existent tiles for terrain tilesets lacking tile availability, i.e. a `layer.json` file.
- Fixed memory leak when removing entities that had a `HeightReference` of `CLAMP_TO_GROUND` or `RELATIVE_TO_GROUND`. This includes when removing a `DataSource`.
- Fixed 3D Tiles credits not being shown in the data attribution box. [#7877](https://github.com/CesiumGS/cesium/pull/7877)

### 1.57 - 2019-05-01

##### Additions :tada:

- Improved 3D Tiles streaming performance, resulting in ~67% camera tour load time reduction, ~44% camera tour load count reduction. And for general camera movement, ~20% load time reduction with ~27% tile load count reduction. Tile load priority changed to focus on loading tiles in the center of the screen first. Added the following tileset optimizations, which unless stated otherwise are enabled by default. [#7774](https://github.com/CesiumGS/cesium/pull/7774)
  - Added `Cesium3DTileset.cullRequestsWhileMoving` option to ignore requests for tiles that will likely be out-of-view due to the camera's movement when they come back from the server.
  - Added `Cesium3DTileset.cullRequestsWhileMovingMultiplier` option to act as a multiplier when used in culling requests while moving. Larger is more aggressive culling, smaller less aggressive culling.
  - Added `Cesium3DTileset.preloadFlightDestinations` option to preload tiles at the camera's flight destination while the camera is in flight.
  - Added `Cesium3DTileset.preferLeaves` option to prefer loading of leaves. Good for additive refinement point clouds. Set to `false` by default.
  - Added `Cesium3DTileset.progressiveResolutionHeightFraction` option to load tiles at a smaller resolution first. This can help get a quick layer of tiles down while full resolution tiles continue to load.
  - Added `Cesium3DTileset.foveatedScreenSpaceError` option to prioritize loading tiles in the center of the screen.
  - Added `Cesium3DTileset.foveatedConeSize` option to control the cone size that determines which tiles are deferred for loading. Tiles outside the cone are potentially deferred.