Hi all, Just noticed this got bumped.
Reminds me of a similar post - check that thread for another method.
@optica as for creation of a half sphere, just create a sphere in the modeling tools and cut it in half with the Model → Plane Cut tool. At that point you’d want to use a two-sided material or flip the normals with PolyGroup Edit → Select All → Flip. (Feel free to create another thread about modeling and tag me if you need any more help with that)