Does the Dolphin Emulator Support 3DTV Output?

I know this is an old question, but Google has it on the first page results for some queries about this question,so to update this, Dolphin does now support 3D. It actually supported 3D for years, but required external software before. The built-in support has generally performs better than other methods did in the past.

The formats currently supported are Side by Side, Top/Bottom, and Anaglyph (Dubois Anaglyph [Red/Cyan]).

Yes, Dolphin supports 3D TVs. Use either the Side‑by‑Side or Top‑and‑Bottom mode.

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Dolphin has 3 different 3D modes. Side-by-Side, Top-and-Bottom, and Anaglyph. The 3D settings are located in Options → Graphics Settings → Enhancements → Stereoscopy.

Side-by-Side and Top-and-Bottom 3D are what you're looking for. This splits the image in half across the screen, and should be compatible with any modern 3D TV.

As Assorted Trailmix mentioned, Dolphin also supports Anaglyph 3D, just in case you have any Red/Cyan 3D glasses lying around.

If you're interested in the history of Dolphin's 3D support, I recommend reading A Second Perspective: An In-Depth History of Stereoscopy in Dolphin. It's an interesting look into both the technical details and history of Dolphin's 3D functionality^*.

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^{*Note: I'm friends with one of the Dolphin Emulator blog writers, so I may be a bit biased. :)}