[yt-dev] Make the default camera lens the perspective lens

[Nathan Goldbaum]

Hi all,

I'm curious what people think about switching the default camera lens from
"plane-parallel" to "perspective".

Perspective cameras are more intuitive - it makes sense to talk about a
camera position and orientation, since all the rays originate from a single
point.

The last time this came up, the major concern was that perspective renders
were not as performant as plane-parallel renders.

Today Kacper submitted a PR that substantially improves the performance of
the perspective camera:

https://bitbucket.org/yt_analysis/yt/pull-requests/2028/

If we benchmark and find that the plane-parallel camera is competitive with
the plane-parallel camera in terms of speed, would it be ok to switch to
perspective for the default camera?

-Nathan
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