model and texture/map question

I have a gltf model with a texture from a jpg image “mymap1.jpg”. Is it possible to use the same .dae file, but change the jpg image that is used to map onto the object? Say if I had a “mymap2.jpg”? Or is there some other way to reuse the same 3D model, but just change the image that goes over the model?

Assuming you mean changing the texture “on-the-fly”, there’s no official way to do it. I made a small example that might do what you want using the private API, but there’s no guarantee it won’t break in a future version of Cesium. Paste this into Sandcastle: