Normal map, output inversion type

[Hasaki]

HI,
I have a question. When I made a SBSAR in Substance Designer, I chose normal as OpenGL, and I used constant value lock to output SBSAR material balls.




When I create a new project in Substance Painter, normal map format selects OpenGL. I'm importing my OpenGL sbsar material ball



After testing,
On the normal of the color space,
If I choose auto, the output normal map will be reversed to become the normal of DX
If I choose DX, the normal output will also reverse to DX
If I choose OpenGL, the normal output is correct, OpenGL
I want to figure out why auto and DX reversed the normal?

My other question is, if I download a material sphere from substance source and use it in SP, how do I output it in SP and make sure that its normal is OpenGL?


Super big thanks!

[Colkaih]

DX reversed the normal because that is what it does. DirectX normals are the opposite of OpenGL as some systems expect that.  Unreal has a "invert green channel" to allow import of either, in Blender, you have to add nodes to invert the channel if you import a DirectX normal instead of an OpenGL one.

[Hasaki]

DX reversed the normal because that is what it does. DirectX normals are the opposite of OpenGL as some systems expect that.  Unreal has a "invert green channel" to allow import of either, in Blender, you have to add nodes to invert the channel if you import a DirectX normal instead of an OpenGL one.

Thank you for your answer. I mean, after I get a new texture ball, I think I have to know whether the normal line of this texture ball is DX or OPENGL!Because of this, I can correctly select the type of normal in the SP's color space.
And just like my test results,
I want to find a way, whether I load a normal map into SP, or a SBSAR into SP, I want a way to make sure that the map I output is OPENGL

[Colkaih]

Just to open up your project settings, (Edit->Project configuration), and set the type of normal map to OGL or DX map. Don't forget as well, you can add a specific output map to do both, using the converted maps section on texture output. As I have said, this is what I do, so I always have both on hand if required.