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Converting 3d coords to 2d


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Does anyone know of a function to convert coordinates in 3d space into 2d space? An example usage for this would be drawing text on the users screen over a 3d position, obviously the location of the text logically is in 3d space, however for it to be rendered it must be rendered in 2d. An example of this already happening in the vanilla game is name tags, however I tried to use the EntityRenderer.drawNameplate function and this did nothing, the text simply did not show up. I tried running the function on world render as well as on ui render.

 

If anyone knows of a function that can allow me to draw items on the screen in 2d over a 3d target, I would really appreciate it. Thanks.

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