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Landscape Textures - Achieving AAA quality Discussion

Hello I’m a game dev. student, and I’ve just recently made the switch to unreal and have been learning up a storm.

That being said, I’m curious as to how current gen games can get their terrain looking so non patterned and so precise?
I’m aware of the idea of patterning noise with multiple textures and using opacity layers on textures to sort of blend textures, but even then in comparison to games like Witcher 3 it seems I can never quite get the resolution they achieve.

Is this witchcraft, or do they really use super dense height maps that allows their splat to be equally as dense resulting in high precision on their terrain textures?