Set the camera's viewport to fit the size of the object

[msDestiny14]

In a quick answer I think you are likely going to want this that was posted earlier today. Using and arc rotate camera and calling useFramingBehavior

Fill the whole scene with the model

You should try the framing behavior: Feels like it is exactly what you need

Let me try to get a playground working with your example since you are loading a mesh and then will want to attach it.