It's in the first party libraries now. https://learn.microsoft.com/en-us/dotnet/api/system.numerics.matrix4x4#methods https://learn.microsoft.com/en-us/dotnet/

It's in the first party libraries now. https://learn.microsoft.com/en-us/dotnet/api/system.numerics.matrix4x4#methods https://learn.microsoft.com/en-us/dotnet/api/system.numerics...