From the screenshot alone, it looks like this is not really a low-level technical problem with the shaders, but more likely a problem with the overall lighting of the scene. You might want to have a look at threads like How to set lighting that might be related. If this does not help, it could be good to provide further information about your light settings, so that someone from the Cesium For Unreal core team can take a look.
Marco13
2
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