PhysicsServer3DExtension inherits from PhysicsServer3D which is a singleton class, since singleton classes are generated as static in C# it would generate invalid C# so for now we'll be ignoring PhysicsServer3DExtension.
PhysicsServer3DExtension inherits from PhysicsServer3D which is a singleton class, since singleton classes are generated as static in C# it would generate invalid C# so for now we'll be ignoring PhysicsServer3DExtension.