Origami simulation paper folding, 3D OpenGL. This small application standalone, shows you how the folding happen. Hen (cocotte, pajarita), duck, boat, swan, butterfly are the first models.
Touch with a finger to pause, turn, touch again to continue. Touch with two fingers to zoom, rotate. Touch icons to change the paper patterns.
Update for iOS 11 with XCode 9.
With Family Sharing set up, up to six family members can use this app.