Cant inherit from my interface

[3dRaven]

Using FMatrix For 3x3?

Yes, if you use it as homogenous matrix, so it looks like this x1 x2 x3 0 y1 y2 y3 0 z1 z2 z3 0 0 0 0 1 So your first constructor is building the identity matrix, which would be FMatrix A = FMatrix::Identity; The second constructor where you copy a 3x3 matrix. In Unreal you cant directly do that, but indirectly using the FPlane constructor FMatrix A( FPlane(a[0][0], a[0][1], a[0][2], 0), FPlane(a[1][0], a[1][1], a[1][2], 0), FPlane(a[2][0], a[2][1], a[2][2], 0), …

Can you make 2D arrays in C++? If so, how?

If you mean a multidimensional array, I believe you can if you don’t plan on exposing them in the editor using UPROPERTY(). Otherwise if you are using it purely in C++ I think you can do something like TArray<TArray<int>> foo; Otherwise if you need to expose them to the editor, the closest thing I could find was using a struct.