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How/why exactly does the amount of light in a room affect the tracking on a virtual camera (iPad)?

I received an iPad as a Christmas gift and have been absolutely loving it for my Unreal projects. For a while I was having issues with lag/rubber-banding when trying to record, and ultimately after multiple tests I found out it was simply caused by my room being too dark. As soon as I turned all my lights on, the tracking became perfect.

So I guess as my title says, why exactly is this the case? How does that work?

Something that’s important to note is that I’m using a standard iPad model, not the Pro which has access to LiDAR.