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Comment by threeseed | Hacker News Reader

With cameras the problem isn't the power or compute. It's the heat dissipation.

Cameras like the Sigma FP are built around the heat sink and have vents all around to dissipate the heat during long recording sessions. Most typical DSLRs simply have recording limits e.g. Canon R6 = 30 mins.

Pretty big issue for a device they are aiming to be around your head for hours at a time.

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That is a valid problem, but with MR pass through there is also a compute issue. The cameras are not in the same location as the users eyes. They have a wider parallax than the users eyes and are forward several inches. There is no simple transformation to correct the video to have the same perspective as the user. Instead a 3d representation of the environment must be created, camera imagery projected on to it, and then rendered to the position of the user’s eye. All of this done as fast as possible and highest rate possible. This explodes in compute with increasing resolutions. MQP is doing this with 3 cameras, color compositing, and without the aide of a depth camera.

The 30 minute limit had little to do with heat:

https://www.fujirumors.com/yes-eu-import-duty-reason-fujifil...

Well, that's not exactly right -they're two sides of a coin. twice the pixels equals twice the power at almost every level. The pixel level, the image signal processor level, the processor, and storage.

In addition to the recording limits on a DSLR, you might need to rest it for a good while if you're filming for a long time with too much light on a hot day. It shuts off when the sensor's too hot.

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