I have a trajectory czml file which the altitude is 0, and attempt to test it in Cesium 1.20. When I call the terrain model by code, the red lines and billboards can be shown completely (shown.png). But if I select the terrain model from baseLayerPicker, the red lines and billboards would be hidden by terrain model. What is the reason? How should I do if I want to select the terrain model from baseLayerPicker and display the czml file properly at the same time?
Thanks a lot~