Hi,
When running EU4 on the PC (Windows 7), does it use OpenGL or DirectX to drive the graphics card?
I ask this because I may have to do some low level programming to add sequential 3D support if possible.
I have experience with OpenGL on how to do this. But I have no experience with DirectX.
Hello,
It uses DirectX, but you can force it to use OpenGL, AFAIK.
Anyway, you don’t have to deal with low-level API dependent stuff, UE4 has powerful interface to graphics APIs - RHI(Render Hardware Interface), writing the code using RHI will result in working code on all the platforms(if the code is compatible with the underlying API level)
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That sounds great. Where can I find the documentation of this RHI API? I searched for it, but could not find it.
Do you think I can implement sequential 3D using this API?
I believe there is no such documentation available, though you still might find something useful here - Graphics Programming for Unreal Engine | Unreal Engine 5.1 Documentation
I think you’ll have to dig deep in the engine to implement this 
Good luck!
Threre is documentation:
Chilitomatonoodle is a great YouTube channel for learning DirectX API and C++.
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