This is a thread to decide whether we should keep the default interpretation of normalmaps the way it is now (so-called DirectX style), or switch to OpenGL style, which interprets the y-axis (green channel) as pointing the opposite direction. Note that the direction chosen doesn't really have any relation to the rendering library you use - it's up to the GPU shader code to decide how to interpret things.

Advantages of switching to OpenGL direction:

• More intuitive: y-component points up, as expected, and the coordinate system is right-handed
• Matches most OpenGL normal mapping tutorials
• Improves compatibility with Xonotic assets

Advantages of staying on DirectX:

• Our assets continue to work unchanged - we don't have to add q3shaders to reverse the direction of every existing normalmap
• Maybe it's more common among games in general? (unclear)