I have a question about the direction of U and V in the UV category of the UVEditor in Unreal Engine 5.1 documentation.https://docs.unrealengine.com/5.1/en-US/uvs-category-in-unreal-engine/

[yujironomura]

Thank you for your kind response. I appreciate your willingness to answer my questions. However, I already know how to animate materials and use the Panner node. I’m just curious about how it works under the hood. So my question to everyone is, if the UV origin in the UV editor is different from the UV origin in the material, then I assume that different UV coordinate systems are being used. Is it correct to assume that Unreal Engine automatically converts between them? Also, why does the official documentation refer to the horizontal direction as V and the vertical direction as U? Is this an error in the official documentation? If anyone can explain this to me, I would greatly appreciate it as I tend to have a hard time understanding these concepts.