Cesium tile server22.10.2020
Cesium is the 3D platform for visualizing globes, from every satellite in space to every building in Manhattan to every crater on Mars.
Over 1. Bringing techniques from graphics research, the movie industry, and the game industry to 3D geospatial, 3D Tiles define a spatial data structure and a set of tile formats designed for 3D and optimized for streaming and rendering. We expect to see other 3D engines and conversion tools use 3D Tiles. In addition, we help move the field forward by publishing related technical articles such as the bounding volume optimizations and plane masking in Cesium.
Development of both the spec and implementation are in-progress, and we encourage open discussion on the Cesium forum. We expect them to stabilize in spring The primary purpose of 3D Tiles is to improve streaming and rendering performance of massive heterogeneous datasets.
The foundation of 3D Tiles is a spatial data structure that enables Hierarchical Level of Detail HLOD so only visible tiles are streamed - and only those tiles which are most important for a given 3D view. Tile payloads can be binary and context-aware compressed, e. As a result, like glTF, the pipeline from receiving a 3D Tile to rendering it with WebGL is streamlined to be fast and simple, and to minimize client-side processing.
To reduce the number of WebGL draw calls, tiles may be pre-batched or batched on-the-fly. Bounding volumes for tiles in a sparse grid layout. Each tile is one WebGL draw call. A zoomed in view looking at Harvard Yard. A zoomed out debug view shows that only a subset of the Cambridge dataset needed to be rendered in the above Harvard Yard view. From the ground up, 3D Tiles are designed for true 3D with a free-roaming camera; they are not limited to cases such as 2.
In 3D Tiles, bounding volumes are 3D, not 2D cartographic extents. In 2D, the tiling scheme is often based on the Web Mercator projection. In contrast, in 3D Tiles the tiling scheme is adaptable, in all three dimensions, depending on the models in the dataset and their distribution.
Traditional geospatial features, such as polygons and polylines, can be extruded or drawn above the surface. But 3D Tiles go beyond points, polylines, and polygons, to account for full 3D models with meshes, materials, and a node hierarchy. Even with WebGL optimizations such as batching, 3D Tiles allow for individual model interaction such as highlighting on mouseover, or removing a 3D building. Tiles can contain metadata for each model to allow additional interaction, such as querying third-party web services using a building ID.
Mouseover highlighting demonstrating 3D Tile interaction. Metadata for individual models, such as building height or year built, can be used for shading at runtime without writing code. Styles can be changed on-the-fly. Height-dependent building color demonstrating 3D Tile styling.
Traditional quadtree subdivision, used in TMS for example, is sufficient for map tiles and 2D, but it is suboptimal for 3D and non-uniform dataset distributions. Instead of rigid spatial subdivision, conversion tools can adaptively subdivide a dataset, for example, based on the cost of rendering each model and the distribution of models, resulting in a balanced data structure.
A runtime engine like Cesium is generic and works with all subdivision techniques. An adaptive quadtree-like subdivision based on the distribution of buildings in Cambridge. With traditional 2D map tiles, when the user zooms in, the visible map tiles are replaced with new higher-resolution map tiles.
This is called refinement.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. As an open specification with an open-source runtime implementation, 3D Tiles allows data providers and app developers to make massive and complex 3D information more accessible, interoperable, and useful across all kinds of tools and applications.
Bringing techniques from the field of 3D graphics and built on glTF3D Tiles defines a spatial hierarchy for fast streaming and precision rendering, balancing performance and visual quality at any scale from global to building interiors.
The 3D Tiles Overview is an approachable and concise guide to learning about the main concepts in 3D Tiles and designed to help integrate 3D Tiles into runtime engines for visualization and analysis of massive heterogeneous 3D geospatial content. This guide augments the fully detailed 3D Tiles specification with coverage of key concepts to help developers jumpstart adopting 3D Tiles. Additional tile formats are under development, including Vector Data vctr [ ] for geospatial features such as points, lines, and polygons.
See the full roadmap issue for plans post version 1. Created by the Cesium team and built on glTF. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Batchfile Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit aba Mar 23, Overview 3D Tiles is an open specification for sharing, visualizing, fusing, and interacting with massive heterogenous 3D geospatial content across desktop, web, and mobile applications.
Open and interoperable As an open specification with an open-source runtime implementation, 3D Tiles allows data providers and app developers to make massive and complex 3D information more accessible, interoperable, and useful across all kinds of tools and applications. Designed for 3D Bringing techniques from the field of 3D graphics and built on glTF3D Tiles defines a spatial hierarchy for fast streaming and precision rendering, balancing performance and visual quality at any scale from global to building interiors.
Semantic, interactive, and styleable 3D Tiles preserve per-feature metadata to allow interaction such as selecting, querying, filtering, and styling efficiently at runtime.
Supports: glTF. Future Work Additional tile formats are under development, including Vector Data vctr [ ] for geospatial features such as points, lines, and polygons.
Contributing 3D Tiles is an open specification and contributions including specification fixes, new tile formats, and extensions are encouraged.
You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Merge branch 'tileset. May 9, Feb 18, Change image for 3D Tiles Overview.Our 3D Tilers let data providers and app developers access and stream 3D content online. This suite of command line tools allows you to tile terabytes of source data in a variety of input formats into open standards optimized for streaming, while maintaining precision.
Contact Sales. Optimize massive 3D data with tools built to scale for lightning fast processing. Integrate into on-premises workflows to reliably tile large datasets without losing fidelity. Measure, analyze, and make decisions with confidence based on visualizations as precise as your source data. Learn more. Contact our sales team to request an evaluation, or ask about custom tiling pipelines and services for your 3D data.
Contact us. Optimize for fast streaming Optimize massive 3D data with tools built to scale for lightning fast processing. Automate data workflow Integrate into on-premises workflows to reliably tile large datasets without losing fidelity. Analyze with accuracy Measure, analyze, and make decisions with confidence based on visualizations as precise as your source data.
Tile your 3D data, and fuse it with other data types Point Clouds. Point Clouds Tiler Billions of points with millimeter precision Efficient subdivision and point compression for faster streaming Per-point attributes preserved for dynamic styling Support for standard formats including LASer. Photogrammetry Tiler Massive textured 3D models Adaptive subdivision and geometry-aware compression for faster streaming Source fidelity preserved with smart mesh decimation for each level of detail Support for standard formats including COLLADA.
Imagery Tiler High-resolution satellite, drone, and aerial imagery Imagery from multiple sources fused with mosaicking Tiles output in widely supported standard formats Automatic reprojection Support for standard formats including Floating Point Raster.
If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. A basic server for serving up filesystem based tilesets representing Cesium.
This has specifically been created for easing the development and testing of terrain tilesets created using the Cesium Terrain Builder tools.
This project also provides a Docker container to further simplify deployment of the server and testing of tilesets. See the Docker Registry for further details. Assume you have the following small terrain tileset possibly created with ctb-tile :. Note that the -web-dir option can be used to serve up static assets on the filesystem in addition to tilesets.
This makes it easy to use the server to prototype and develop web applications around the terrain data. The CesiumTerrainProvider Cesium. The ctb-tile utility does not create this file.
When creating tilesets using the ctb-tile utility only one of these tiles will be generated unless the source terrain dataset intersects with the prime meridian. The terrain server addresses this issue by serving up a blank terrain tile if a top level tile is requested which does not also exist on the filesystem. The terrain server can use a memcache server to cache tileset data.
It is important to note that the terrain server does not use the cache itself, it only populates it for each request. The idea is that a reverse proxy attached to the memcache such as Nginx will first attempt to fulfil a request from the cache before falling back to the terrain server, which will then update the cache.
Enabling this functionality requires specifying the network address of a memcached server including the port using the -memcached option. A memcached server running at memcache. If present, the terrain server uses the value of the custom X-Memcache-Key header as the memcache key, otherwise it uses the value of the request URI.
A minimal Nginx configuration setting X-Memcache-Key is as follows:.
The -cache-limit option can be used in conjunction with the above to change the memory limit at which resources are considered to large for the cache. The server is written in Go and requires Go to be present on the system when compiling it from source. As such, it should run everywhere that Go does. The code has been developed on a Linux platform.Extract the contents of Cesium-ion-3D-Tiling-Pipeline. This will start the server on port and serve all 3D Tiles, terrain and imagery in the Data directory.
You can also specify multiple directories to serve:.Migrating from Google Earth to Cesium - How to begin your closed-to-open source success story
Install Node. Open up a terminal window in the cesium directory and install the required dependencies:. To add 3D Tiles from a. Make sure to use the link to your local server in the url field above. Now if you re-run the Hello World demo you should see your 3D Tiles streamed from your local server and visualized in your browser! Discover features, rapidly prototype, or browse common use cases with Cesium code snippets right in your browser.
Hosting 3D Content
Cesium has an active community of developers and users. Along with members of the Cesium team, they support all kinds of technical questions. Ask the community forum. Starting the server Run this command in the extracted directory: Copy to clipboard.
Data copied clipboard. Copy to clipboard. Live code examples Discover features, rapidly prototype, or browse common use cases with Cesium code snippets right in your browser. Community Support Cesium has an active community of developers and users.
Use Cesium ion to stream your own tiled terrain data or high resolution curated terrain such as Cesium World Terrain. Open the Hello World example in Sandcastle.
By default, the globe is a WGS84 ellipsoid. Specify a different terrain provider by passing the terrainProvider option to the Viewer. This tutorial uses terrain served from Cesium ion. Create an account to get your access token to use the terrain in this tutorial. Sign up here and the above sample code will automatically update with your token. If you already have an account, sign in. After modifying the example, press F8 to run it. Zoom to a mountainous area, and hold down the middle mouse button and drag to tilt to a horizon view.
As we zoom closer, CesiumJS requests higher resolution terrain based on what parts of the globe are visible and how far away they are. Terrain and imagery are treated separately, and any imagery provider can be used with any terrain provider. See the Imagery Layers Tutorial for managing imagery. Cesium World Terrain also includes data for terrain lighting and coastline data needed for water effects. By default, this data is not sent with the terrain tiles. To enable terrain lighting, requestVertexNormals and enable lighting on the globe.
Water effects are enabled in a similar manner, using requestWaterMask :. The waves animate over time and bright specular highlights show the reflection of the sun and moon. The water effect can be customized by changing the normal map used to create waves with Globe.
See the terrain example in Sandcastle to explore a few choice areas with interesting terrain and water. Cesium World Terrain : High resolution worldwide terrain, supporting both terrain lighting and water effects by extension.
Cesium World Terrain is hosted in Cesium ion or can be purchased for offline use. Add it to your CesiumJS apps for fast and efficient terrain visualization.
Cesium World Terrain is also available for use on-premise. Cesium supports several methods for requesting terrain using terrain providers. Terrain providers differ based on how requests are formatted and how terrain data is organized.
CesiumJS supports the following terrain providers:. Terrain providers are constructed similarly to imagery providers and usually include the url of the terrain server and an optional proxy if the server does not support Cross-Origin Resource Sharing CORS.
Introducing 3D Tiles
Checkout the terrain example in Sandcastle and the reference documentation for all terrain providers. Discover features, rapidly prototype, or browse common use cases with Cesium code snippets right in your browser.Gets or sets a clock that is used to get keep the time used for time dynamic parameters. Gets the credit to display when this imagery provider is active. Typically this is used to credit the source of the imagery. Gets or sets a value indicating whether feature picking is enabled.
If false, WebMapServiceImageryProvider pickFeatures will immediately return undefined indicating no pickable features without communicating with the server. Set this property to false if you know your data source does not support picking features or if you don't want this provider's features to be pickable.
Gets an event that is raised when the imagery provider encounters an asynchronous error. By subscribing to the event, you will be notified of the error and can potentially recover from it. Event listeners are passed an instance of TileProviderError. Gets a value indicating whether or not the images provided by this imagery provider include an alpha channel.
If this property is false, an alpha channel, if present, will be ignored. If this property is true, any images without an alpha channel will be treated as if their alpha is 1.
When this property is false, memory usage and texture upload time are reduced. Gets the maximum level-of-detail that can be requested. Gets the minimum level-of-detail that can be requested. Gets a promise that resolves to true when the provider is ready for use.
Gets the rectangle, in radians, of the imagery provided by this instance. Gets the tile discard policy. If not undefined, the discard policy is responsible for filtering out "missing" tiles via its shouldDiscardImage function.
If this function returns undefined, no tiles are filtered. Gets the height of each tile, in pixels. Gets the width of each tile, in pixels. Gets the tiling scheme used by this provider. Gets or sets a time interval collection that is used to get time dynamic parameters. The data of each TimeInterval is an object containing the keys and values of the properties that are used during tile requests.
DeveloperError : getTileCredits must not be called before the imagery provider is ready.
Bring Your 3D Data Anywhere
Asynchronously determines what features, if any, are located at a given longitude and latitude within a tile. This function should not be called before ImageryProvider ready returns true. A promise for the picked features that will resolve when the asynchronous picking completes. The resolved value is an array of ImageryLayerFeatureInfo instances. The array may be empty if no features are found at the given location.
DeveloperError : pickFeatures must not be called before the imagery provider is ready. Requests the image for a given tile. A promise for the image that will resolve when the image is available, or undefined if there are too many active requests to the server, and the request should be retried later. DeveloperError : requestImage must not be called before the imagery provider is ready. Object with the following properties: Name Type Default Description url.
Resource String. The layers to include, separated by commas. Set this property to false if you know your WMS server does not support GetFeatureInfo or if you don't want this provider's features to be pickable.