How does the PointsTo3D node work?

I’m so impressed by this node and how easily it can find Z-position for objects when you don’t have a point cloup. I’m using After Effects for compositing as well, and from what I know, you can’t do this – at least not that easy. So does anyone know how the node works – maybe it would be possible to reproduce through scripting/expressions in other applications. How did you guys find Z-positions before that node existed, or in other applications?
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