Hello I have a question about the normal map format when downloading Sketchfab models.
If I understand correctly, the Sketchfab online viewer uses the DirectX format, and thus normal maps uploaded in OpenGL format should be converted by checking the flip green button.
Is the flip green button only a display function of the Sketchfab online viewer, or is the uploaded normal map texture converted?
For example, when a user uploads an OpenGL normal map and checks the flip y button. When we then download his 3D model, do we get the original normal map texture in OpenGL or a converted DirectX normal map?
thank you for your time