What computer vision technology/concept I need to learn for spatial computing?

Hi all, I'm very interested in computer vision, especially in the Extended Reality field. I know computer vision plays a huge part in this field, due to the capability of analyzing spatial data (and therefore placing digital objects accordingly). I will also participate in a long-term computer vision project at my company soon (visual inspection of manufactured instruments) and I'm wondering if you can share your learning experience. More specifically, what foundational knowledge do I need to truly understand it? …

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