c++ - OpenGL: How to calculate the angle where my mouse is pointing at in the 3d space? -

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I just need to know which angle (x, y, z vector) is pointing my cursor so I can kill any particle in the direction. I

I can not use depth tests, so the typical picking method is not an option.

Is it possible with pure mathematics only? If I know View Port Aspect Ratio and Perspective etc?

Edit: I need to get coordinated with the blank view. Completely empty, not exactly drawing!


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