Cannot flip widget

[adrianvintu]

Using the git example https://github.com/glorylab/wave, I am trying to flip the widget. either by flipping the card

Transform(
  transform: Matrix4.rotationY(math.pi),
  child: _buildCard(

or by flipping the control

Card(
...
  child: Transform(
    transform: Matrix4.rotationY(math.pi),
    child: WaveWidget(
      config: config,
      backgroundColor: backgroundColor,
      backgroundImage: backgroundImage,
      size: Size(double.infinity, double.infinity),
      waveAmplitude: 0,
    ),
),

Both methods fail - first method completely hides the card, the second method shows empty card.

Can you please check this?

Thank you!