Why did Grant rotate the unwrapped UV map in the UV editor vs rotating the texture mapping using the nodes in the shader? Is it just another way to do this, or is there a specific reason for it>
I do not think it has ever occurred to anyone to do it by numbers in a node instead of a visually simple way of rotating the UV.
It may work in the node, no idea. But as you clearly understand there are many ways to do things in Blender.
I think it’s a habit.
I also not change the texture because when editing it in GIMP or so. It has a default up and down direction. But as NP5 explained, there are many ways to do things in Blender.
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