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This is impressive, but why are they all looking still like a video game? Could they have this render movie scenes with realistic looking humans? I wonder if it is due to the training set they use being mostly video games?

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I highly doubt it. While there is no ceiling in principle on how good rendering can get, even with perfect knowledge of the physics of optics, the cost to compute that physics is too high not to cut some corners. Nature gives you this for free. Every photon is deflected at exactly the right angle and frequency without anything needing to be computed. All you need is a camera to record it. At least for now, this is why every deep fake, digital de-aging, AI upscaling, grafting Carrie Fisher's face onto a different actor, and CGI in general inevitably occupies the uncanny valley.

> This is impressive, but why are they all looking still like a video game?

Many of the current AI models have their roots in games: Chess, Go, etc.

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