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What kind of projection is this? (Sonic X-Treme)

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I've stumbled upon some videos (e.g.
">Crystal Frost,
">Death Egg) of the unreleased Sonic X-Treme on youtube. The unusual projection sparked my curiosity. At first glance it looks like they used regular perspective projection and turned the fov way up, but on a second look it becomes clear thats not it. E.g. straight lines are projected as curves. This can be observed in some raytracing demos, such as
">this. I'm not sure if that is the same projection as in Sonic X-Treme, though...

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Ah, yes, that sounds about right. I've programmed a fisheye zoom as a posteffect, but it didn't occur to me to use it in this way.

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