How is the auto-rotation implemented (camera rotation vs translation)?

[niubiplus2]

Hi, love this WebGL 3D Gaussian Splat Viewer — great work!

I noticed that the scene starts auto-rotating when the page loads.
I’m curious how this motion is implemented internally:

Is the effect achieved by changing the camera rotation (R), the translation (T), or both?

If translation is involved, how do you decide how much to move along each axis?

I’m trying to reproduce a similar “natural 3D rotation” effect and would really appreciate some insight.

Thanks a lot!