Play around with https://github.com/graphdeco-inria/gaussian-splatting and create a couple of scenes. Mix in 3D content that is traditionally rendered. Render also onto a sphere to produce the contribution of the scene light and transfer the scene light onto the rendered 3D object. Effectively, you create a light probe.
If you are interested in this topic or for more information please contact Prof. Helmut Hlavacs (helmut.hlavacs(at)univie.ac.at).