Normal map is not correct in Octane

[seker800]

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.

test.obj

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[galleon27]

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.

[seker800]

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 don’t really understand the setting of normal maps. Is there a different standard for normal maps?
As a result, it is available in some software and unavailable in other software.

[seker800]

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.

Solved, I need to invert the green channel

[linograndiotoy]

I don’t really understand the setting of normal maps. Is there a different standard for normal maps?
As a result, it is available in some software and unavailable in other software.

Yes, you have 2 standards, DirectX and OpenGL. And yes, they only differ in the way they're dealing with the Y (Green) channel, as you discovered.