While the clockwork versions may still exist in small school planetariums, the digital-mechanical hybrids are all long gone. You can thank Evans and Sutherland for demoing a version back in the early 80's, using a single, b&w tube projector through a Nikon 8mm (fisheye) camera lens. In spite of limitations that you'd all laugh at, it was instantly obvious that this was the future.
MichaelSmith is correct, the digital video projectors have yet to get close to the pinpoint-sharpness of the old electro-mechanical projectors, and those monsters were a delight to watch in motion. But having operated those old beasts (Spitz STS), the limitations far outweigh the benefits.
With the near-perfect rendition of consistent motion across the entire field of view, a modern digital video planetarium can utterly swamp the viewer's visual cortex: "sharpness" just doesn't matter when you can fly through Saturn's rings. I can say that I can't discern the "blurry dots" once the show gets rolling, I'm pretty comfy asserting that the average viewer's just drooling while their brains leak out of their ears. Having endorsed the modern, I'll confess to a desire to sit and watch the last STS (at Eastern Kentucky University) just quietly "roll" the sky, but that's nostalgia talkin'.
As for playing a game on a digital video dome? Innnnnteresting. I'm happy to tell you that as a witness to the history MichaelSmith elevates, get outta my way, I'm goin' to Dr. Tyson's place for game-night.
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