Cesium for Omniverse Quickstart
This is a quickstart guide to loading Cesium ion content into NVIDIA Omniverse USD Composer (formerly Create) using the Cesium for Omniverse extension.
Cesium for Omniverse scene set in San Francisco, California, USA.
You’ll learn how to:
- Add the Cesium for Omniverse extension into Omniverse USD Composer (formerly Create).
- Create a new stage and import assets from Cesium ion.
- Set your project's default ion asset token.
- Save your stage to a USD.
Prerequisites
- An installed version of NVIDIA Omniverse Launcher 1.8.2 or later. For instructions on installing Omniverse Launcher, visit the Omniverse download page and refer to the Installing Launcher guide.
- An installed version of Omniverse USD Composer 2023.2.0 (Beta) or later. For instructions on installing Omniverse apps such as USD Composer using the Omniverse Launcher, visit the Install Apps guide. For specific information on using Omniverse USD Composer, visit the Omniverse USD Composer documentation.
- A Cesium ion account to stream terrain, building, and photogrammetry assets into Omniverse. Sign up for a free Cesium ion account if you don’t already have one.
Cesium ion is an open platform for streaming and hosting 3D content, and includes global, curated data that you can use to create your own real-world applications.
1. Download the Cesium for Omniverse extension release 0.11.0.
Because of the rapid evolution of the Omniverse ecosystem, previous versions of USD Composer and other Omniverse applications may be compatible only with older versions of Cesium for Omniverse. An indicative version compatibility table is shown below.
2. Extract the contents of the zip file into the following location within your computer’s user documents folder: /Kit/Shared/exts.
3. Launch Omniverse USD Composer (formerly Create) using the Omniverse Launcher.
Navigate to the Library tab of Omniverse Launcher and select USD Composer from the apps list. Launch USD Composer by clicking on the Launch button.
4. Once Omniverse USD Composer has opened, open the Extensions panel by clicking on Window > Extensions in the menu.
5. Search for the Cesium for Omniverse extension under the Third Party section of the Extensions list and select it from the list.
6. Turn on autoload; then close and relaunch Omniverse USD Composer.
Cesium for Omniverse requires autoload to be checked in order to function correctly. If you disable and re-enable the extension in the future, always be sure to check autoload and restart Omniverse USD Composer before use.
7. Once Omniverse USD Composer launches, you will be prompted to enable the Omniverse Fabric Scene Delegate. Fabric enables high-performance creation and modification of scene data and is a fundamental part of the tile-streaming engine in Cesium for Omniverse. Click Yes to enable Fabric.
8. Verify the Cesium for Omniverse extension has loaded correctly by confirming a Cesium tab is now present in the right sidebar.
1. Open the Cesium window by selecting the Cesium tab on the right sidebar.
2. Click the Connect to Cesium ion button.
3. A pop-up browser window will open. If you are not logged in, log in to your Cesium ion account. You can also sign in with your Epic Games, Github, or Google account.
4. Once you are logged in, you'll see a prompt asking you to allow Cesium for Omniverse to access your assets. Select Allow, then return to Omniverse USD Composer to continue.
5. Now you'll create a default access token for your project. Every asset that you stream from Cesium ion requires an access token. In this tutorial, you'll set a project-wide access token that all your assets will use.
Click on the Token button at the top of the Cesium window.
6. A new window will appear to configure the token. Select the Use an existing token checkbox, and choose Default Token from the drop-down menu. Then, press the Use as Project Default Token button.
Alternatively, If you already have a token in your Cesium ion account that you would like to use, you can select it from the Use an existing token drop-down. You can also specify a token by selecting Specify a token and entering a Cesium ion token into the corresponding text field.
The Create a new token option will automatically create a new token within your Cesium ion account; however, you will need to manage that token's permissions manually via Cesium ion.
The default token in your Cesium ion account has read access to all individual assets associated with your account. Using the default token is a convenient choice for development but should not be used in production apps. For more information on token management within Cesium ion, visit the Cesium ion Access Tokens guide.
Omniverse USD Composer opens with a default Stage on launch. Verify that it contains the following content. If this content is missing, you can create a new stage by clicking File > New.
With these basic objects in your stage, you are ready to add an asset from Cesium ion.
1. Firstly, remove the Ground object from the stage by right-clicking on its entry and selecting Delete.
2. From the Cesium window, add Cesium World Terrain + Bing Maps Aerial imagery by clicking the corresponding button.
Terrain will start to appear in the scene.
3. Take a look at the Stage window. You should see three Cesium-related objects. One of them, Cesium_World_Terrain, is the tileset you just created. The other two, Cesium and CesiumGeoreference, are created automatically by Cesium for Omniverse and contain shared scene information such as georeferencing coordinates.
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4. If Cesium World Terrain is not already selected, select it now. In the Property window, you'll see more information about this object. Scroll down to Cesium Tileset Settings to see properties specific to Cesium tilesets.
This is a Cesium Tileset prim. It streams 3D Tiles data into Omniverse and provides ways to configure that tileset.
You'll learn about many of the available settings in future tutorials. For now, feel free to explore and try out the different settings yourself. Hover over any setting with your mouse to learn more about what it does.
Once you're ready, continue to the next section.
In your stage, you should be using the default Perspective view. As you navigate the stage in this view, particularly if you move high above the terrain or try to zoom to extents on the globe, you may notice the terrain on the horizon is abruptly cut off or the globe disappears completely.
This happens because the perspective view in Omniverse is configured to see a limited range in front, specifically 10 kilometers by default.
Cesium World Terrain is a full-scale globe, which is almost 8,000 thousand miles in diameter! Fortunately, you can manually adjust Omniverse’s perspective camera so that it can render much farther into the distance, including visualizing the entire globe from far off in space if required.
1. Click the properties button next to the Perspective entry in the camera drop-down menu on the viewport.
The perspective camera properties will appear in the Property Panel. Scroll down to the Clipping section, and adjust the Y value to a larger value. The number in this box is the distance in centimeters; increase it to 10000000000.0 (10,000 km). This will ensure your globe is visible from far in space.
The Near clipping plane (X value) is the minimum distance from the camera where objects start to appear. If this is a large value, objects close to the camera will not show up. On the other hand, the Far clipping plane (Y value) is the maximum distance from the camera that objects will appear. Anything farther than the Far plane will not appear.
Far clipping can be used to improve rendering performance by limiting the amount of data the graphics card needs to render. Although it may be tempting to increase this value to the maximum, we recommend choosing the smallest value that best suits your specific use case.
Now that your camera can see more of the stage, feel free to position the camera to get the best view of the terrain. For more information on navigating within the Omniview viewport, visit the Viewport Navigation guide.
Now that you’ve adjusted your camera to render more of the Omniverse stage, let’s return to adding content. Cesium for Omniverse can visualize more than just terrain, which we can demonstrate by adding a global dataset of city buildings.
1. Select the CesiumGeoreference object in the Stage window. This object determines where in the world your Omniverse scene is set. The scene's current latitude, longitude, and height can be changed with this object’s properties.
2. In the Property window, look for the Latitude, Longitude, and Height variables under the Georeference Origin Point Coordinates header.
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These coordinates currently point to the hills outside Denver, Colorado, USA.
3. Change these variables to the coordinates below. This will locate the stage around San Francisco, California, USA.
Latitude: 37.7749
Longitude: -122.4194
Height: 0.0
After entering these coordinates, the scene will have shifted to the new location. This is how it appears at the Omniverse origin. You may need to zoom out to see the city.
4. The city looks very flat because Cesium World Terrain doesn't include building details. Fortunately, the Cesium OSM Buildings dataset can be added to fill the empty space.
In the Cesium window, locate the Cesium OSM Buildings option underneath Quick Add Cesium ion Assets. Click to add the data to the scene.
The buildings should now appear on top of the terrain. You may be able to recognize some of the buildings that make up the San Francisco skyline!
Congratulations—you've created your first scene with Cesium for Omniverse. Feel free to explore and check out the world!
Now you are ready to add your own assets to the scene. Be sure to save your scene using File > Save, as we’ll continue working with this scene in future tutorials. You can then continue on to Adding Datasets.