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Shadow Map Positioning and Resolution

I'm currently learning C++ and OpenGL and was wondering if anyone could walk me through what is exactly happening with the below code. It currently calculates the positioning and resolution of a shadow map within a 3D environment. The code currently works, just looking to get a grasp on things....

Cascaded Shadow maps not quite right

Ok. So, I've been messing around with shadows in my game engine for the last week. I've mostly implemented cascading shadow maps (CSM), but I'm having a bit of a problem with shadowing that I just can't seem to solve. The only light in this scene is a directional light...