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Projections: Need help on simple exercice

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Hello, I am studying computer graphics and I got a small problem, I can't seem to figure out  how to calculate projections. 


I have a set of points, that I want to project to a certain plane, in this case z = 0.


I want to project this in Central/perspective projection with center = (0,0,0) , but I can't seem to find a way to do it.

This is a sample exercice that I am studying for a exam, so any help would be great,


in the attachment is the sample points I have from a exam. If someone could explain how would I procceed to do this, or link to a simple enogh tutorial I would be very gratefull.


Thank you very much.

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