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There is an unnatural shadow on the surface and it feels very strange. It feels strange even with a smooth shader, and it feels strange even when displayed with a flood shade. The direction of the normal is correct, and the only way to improve this is to redraw the surface.

In the image below, the surface appears curved and there are unnatural shadows.

enter image description here

The image below is the pattern with the surface reattached. Unnatural shadows are gone. However, it is difficult to apply this to all aspects that feel uncomfortable.

enter image description here

This is the smooth shader version. Still feels strange

enter image description here

There are many faces, edges, and vertices here. As a result, I thought it looked strange and that there was a shadow, but when I compared other parts of this mesh, I found that the same phenomenon did not occur.

enter image description here

What is the reason for such an event? I don't want to use a subdivided surface because I want to eventually bring it to the unreal engine. if you'd kindly teach me.

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Go to Object Data Properties > Geometry Data and click on the button Clear Custom Split Normals Data. I do not know how you created the custom split normals (there are different possible ways), but once you got rid of them the shading is back to normal.

custom split normals

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  • $\begingroup$ thank you ！！Learn about custom split normal on your own $\endgroup$
    – vector man
    Commented May 6 at 14:10
  • $\begingroup$ @vectorman What do you mean by "learn about custom split normal on your own"? $\endgroup$
    – Gordon Brinkmann
    Commented May 7 at 18:26

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