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Convert 3D to 2D positions

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Hello there !

I'm working on a 3d RTS and I have the basic unit selection code working, the problem is when I want to select multiple units using a selection box.

The method I thought of was convert the 3d coordinates of the units into 2D coordinates and the select them using a 2D selection box.

The problem is I can't seem to convert the 3D coordinates into 2D coordinates.

I'm sure this isn't very hard to do, but somehow all the methods I tried so far failed.

Any help on this would be greatly appreciated !

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