Table of Contents

Cesium: Using the Cesium Earth

Setting the Planets

Once a Cesium token has been connected, the model for the Earth and Sun must be swapped to the Cesium versions. These are specific planet models that Nominal has developed to be compatible with Cesium-Ion. They are project preferences and will adjust the model for all levels while the setting is enabled. To enable Cesium, select Edit → Project Settings and under Nominal For Unreal Settings, there will be two parameters; Sun Blueprint Class and Earth Blueprint Class. By default, these will be set to none. This will use the default classes for the Earth and Sun (which can be found in the content folder of one of the plugins). Change the classes to:

  • BP_CesiumSun
  • BP_CesiumEarth

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Note

Adjusting these settings will turn on Cesium for all levels that are played while the Cesium Earth is in use. To disable Cesium, revert the settings back to none to use the default planets objects.

Free-Moving the Observer

The observer is normally configured to follow spacecraft and objects within the simulation. The observer has a reference point in which rotating the camera around will appear to ‘orbit’ that point. For a standard free-looking observer, the reference point needs to be moved to within the observer. This can be done by first detaching from any followed objects and then scrolling the mouse wheel, changing the distance to the focal point to zero.

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Note

To detach from simulation object tracking, press 0. Pressing any of the number keys will begin following the spacecraft and ground stations in the order that they were created. Pressing 9 is the exception and the observer will be able to orbit the Earth.

Debugging Errors

After Cesium Earth has been enabled, if the access token is configured incorrectly or not connected, the Earth will look like the following, only displaying the atmosphere and no surface to the planet:

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To fix this, ensure that the access token is valid and connected to a working account.