Need to know how to convert Mesh to curve

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I want to is there any simple way of converting mesh to curve??
Or any way to automatically create a curve exactly as an object??

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https://blender.stackexchange.com/questions/72754/how-to-convert-a-mesh-model-to-a-curve-surface

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doesn’t work

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Depends if your mesh would naturally transition to a curve, that is, it’s made of edges only. I doubt you’d be able to take a mesh and have it converted to a batch of curves reliably.

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I think geo nodes help in this case. You can convert your mesh to curves without removing faces, plus you can convert between splines or polycurves (similar behavior to polys but they are curves). Then you can convert your curve to mesh by creating a profile. Is that what you’re looking for?

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I added a noise offset so you can see you can modify the curves there too, you just need to use the green nodes.

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