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enter image description here

when I import OBJ file. The edge becomes 'strong'. some edges are good, but most of them are like this in picture.

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These light blue edges are marked sharp.

Sharp edges

It means they will be sharp when you Shade Smooth the object and Auto Smooth the Normals

Smooth and Autosmooth

You can remove them by selecting them, pressing Right mouse button and selecting Clear Sharp

enter image description here

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  • $\begingroup$ thank you so much $\endgroup$ – garyyang4019 Sep 10 '20 at 3:04
  • $\begingroup$ You are welcome. $\endgroup$ – Joonas Sep 10 '20 at 8:25

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