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I make the surface defined by two curves. How to get UV output for this mesh? enter image description here

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  1. Use capture attribute to get original positions:

enter image description here

Adding 0.5 makes coordinates range from 0 to 1, perfect for UV

  1. Set output to new attribute in modifier:

enter image description here

  1. Use attribute node to get this generated UV:

enter image description here

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The Mesh Grid contains a default UV. You can use it by getting the 'uv_map' attribute.

enter image description here

enter image description here

You can also calculate the uv using the vertex index and X & Y count. You can use this with any deformed grid.

enter image description here

enter image description here

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