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Background (I modeled this object on autocad, open the dwg in sketchup and saved as DAE file)

I opened the DAE file on blender and instead of a curve I'm presented with several faces in the shape of the curve - as seen in the pics.

How do I turn it into a single curve and smooth it?

I apologize if it's a basic question but I have been looking around (tutorials) but I can't seem to find an answer.

Thank you in advance

enter image description here

enter image description here

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Blender is not NURBS modeler (even though it has a basic shapes) ...
Also I'm not sure if DAE can handle this kind of data. Export is usually converted to polygons.

To smooth curvature you can

  • simply use Shade Smooth with Normals set to Auto to keep edges sharp ...
  • or with combination of Subdivision Surface modifier limited to Angle ...
  • or create an curve oval shape and use another curve with such vertical profile to be Bevel of first curve

Under blender 3 it can be done also via Bevel Profile properties of the first oval shape ... See Manual

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