Add direct render+export and notifications

[ginazhouhuiwu]

Directly render and export things from the viewer, with notifications!

Uses a simple notification addition from nerfstudio-project/viser#225.

https://github.com/nerfstudio-project/nerfstudio/assets/42229107/147d3fd9-1c8e-432e-a616-9f2b5e2a0435

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TODO:

• [x] thoroughly test export functionality
• [x] add error notifications if encountered during render/export

[maturk]

Nice PR. @ginazhouhuiwu, is it possible to also add the option to "capture frame" or something similar, where only a single image is saved instead of a video.

[ginazhouhuiwu]

that sounds like a great feature I will try implementing! Thanks for taking a look : )

[maturk]

that sounds like a great feature I will try implementing! Thanks for taking a look : )

Yeah, it has been a feature that I have seen some users bring up a few times in the past, just to quickly take some snapshots from a certain angle (perhaps using the same camera intrinsics as the original training dataset, but I think that is configurable in the gui anyways). Just some additional thoughts ... :)

[kerrj]

Super cool! Would also be great to build out some functionality for previewing the render as it goes and perhaps canceling it. Would be cool to also integrate with viser's download functionality to download the final render directly to someone's machine :)

[ginazhouhuiwu]

Local download! Supported for both render and exports now : )

https://github.com/nerfstudio-project/nerfstudio/assets/42229107/901dcdd9-58c3-4730-ad47-6c0b7afbb9be