03.
Flatten the model.
Prepare to rotate the origami star model by 90 degrees.
04.
Rotate the origami star model by 90 degrees.
The open-side is at the top.
Prepare to apply a valley-fold and then unfold.
Here we set the epsilon to be 1/2 but you can change its value.
You can vary its value to be between 1/2 and 1/3.