Probably not much harder, but you wouldn't get the same massive jump in quality that you get going from 1 image to 2. NeRF/Gaussian Splatting in general is what

Probably not much harder, but you wouldn't get the same massive jump in quality that you get going from 1 image to 2. NeRF/Gaussian Splatting in general is what you're describing, but from the looks of it, this just does it in a single forward pass rather than optimising the gaussian/network weights.