Cesium 3d Model. You have two options. Cesium ion also provides a solution to convert collada models to gltf for optimized streaming into cesiumjs apps.
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This sounds like your model is not properly aligned with cesium s axes convention. In addition individual gltf nodes are pickable with scene pick and animatable with model getnode. An end to end platform for 3d geospatial visualization and simulation cesium ion cesium ion.
Introduce an intermediate coordinate system that re orients the model within your app needs a bit of math though.
The cesium sandcastle provides an interactive environment for testing cesium code. For developers use the open source cesiumjs library to create custom 3d mapping apps. This sounds like your model is not properly aligned with cesium s axes convention. The cesium sandcastle provides an interactive environment for testing cesium code.