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neilk t1_j6lf4hb wrote

Reply to comment by WeirdGamerAidan in ELI5: Why do computers need GPUs (integrated or external)? What information is the CPU sending to the GPU that it can't just send to a display? by WeirdGamerAidan

The CPU is like "here are all the 30 thousand triangles that represent this thing, and here is the angle from which I would like to view it. Please do the complex mathematical transformations that a) rotate all 30 thousand triangles in space b) project all 30 thousand triangles from 3D space into 2D triangles on a screen"

There's also stuff to figure out what parts of the model are hidden from view, reflections, textures, shadows, etc, but you get it.

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