The normal map is displayed correctly. You can even see the errors in the Normal map texture that you attached. Your bake is not good.
Here is a screenshot of your OBJ from Houdini Viewport. You can see the same thing happening. I'm guessing your normals didn't export the way you wanted them ...

The normal map is displayed correctly. You can even see the errors in the Normal map texture that you attached. Your bake is not good.
Here is a screenshot of your OBJ from Houdini Viewport. You can see the same thing happening. I'm guessing your normals didn't export the way you wanted them.


I ...

I baked the normal map of the 3D model in 3dcoat, and I imported the normal map into Substance Painter, there is no problem.

However, the normal map is not displayed correctly in Octane.

Thanks, I solved the problem.

Hi

The version I used is
Blender Octane Edition - 21.3 (2.81)
Octane Server - Enterprise Edition - 21.3

But I couldn't find plugin in Blender.
I wonder if there is any way to solve this problem.