Irrlicht Engine

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        private Microsoft.DirectX.DirectInput.Device mKeyboard;
        private Microsoft.DirectX.DirectInput.Device mMouse;

...

            mKeyboard = new Microsoft.DirectX.DirectInput.Device(Microsoft.DirectX.DirectInput.SystemGuid.Keyboard);
            mMouse = new Microsoft.DirectX.DirectInput.Device(Microsoft.DirectX.DirectInput.SystemGuid.Mouse);

            mKeyboard.Acquire();
            mMouse.Acquire();

...

        public void update()
        {
            Microsoft.DirectX.DirectInput.MouseState state = mMouse.CurrentMouseState; // this is important cause everytime you call CurrentMouseState the distance the mouse travelled will be queried again and i don't think you will move your mouse very far during two function calls ;) so save the whole state in a variable and get the values from that one
            int mousex = state.X;
            int mousey = state.Y;

            if (mousex != 0)
            {
                float turny = (float)mousex / 5.0f;
                mMouseX = mousex;
                mOr.Z -= turny;
            }
            if (mousey != 0)
            {
                float turnx = (float)mousey / 5.0f;
                mMouseY = mousey;
                mOr.X += turnx;
            }

            if (mKeyboard.GetPressedKeys().Length > 0)
            {
                Microsoft.DirectX.DirectInput.Key[] Keys = mKeyboard.GetPressedKeys();
                for (int i = 0; i < Keys.Length; i++)
                {
                    if (Keys[i] == Microsoft.DirectX.DirectInput.Key.W)
                    {
// there is an error here somwhere, this is mathematically not completely right, but i have been too lazy to iron it out ;)
                        mPos.X += (float)System.Math.Sin(((mOr.Z % 360) / 180.0f) * System.Math.PI) * 0.4f;
                        mPos.Y += (float)System.Math.Cos(((mOr.Z % 360) / 180.0f) * System.Math.PI) * 0.4f;
                        mPos.Z += (float)System.Math.Cos(((mOr.X % 360) / 180.0f) * System.Math.PI) * 0.4f;
                    }