Apparently using PlayCanvas.
> and rigged to be out of each other's lines of sight
I think there's a misunderstanding of the industry here, if you think the viewing audience will be concerned about some poorly disguised cameras at the edges of the scene.
Both descend from (and cite) 3D Gaussian Splatting for Real-Time Radiance Field Rendering https://arxiv.org/abs/2308.04079 but take it into entirely different directions.