§ Origami box pleating
 Box pleating: subdivide paper into grid, then create into grid.
 To creases into model, use the Elias stretch
 We get 3 types of creases: hinge, ridge, axial
 red for ridge, blue for hinge.
 hinge: what we cut along to dissect the model along hinges.
 ridge creases: creases that are diagonal / angle bisector of the polygons (in box pleating, is always square).
 BPstudio (boxpleating studio) is the tool used to make box pleating.
§ Minimum grid size computatation

(sum of lengths of tree edges * 2)/4
.  for an edge flap, it takes
2 * edgelen
of perimeter when unfolded.  for a river, it also takes
2 * riverlen
of permiter when unfolded.  in total, we take
sum (2 * len)
over all edges/rivers of perimeter.  perimeter is
4 * squaresidelen
.  So we get that
squaresidelen
equals (sum of lengths of tree edges * 2)/
.
§ Axial box pleating
 In the folded model, pick an imaginary line on which only valley creases lie
 also, all the hinge creases are perpendicular to this imaginary line.
 A model is axial box pleated if there is an axis such that all hinge creases are orthogonal to this imaginary line.
§ Axial plus i creases
 Only creases can be referred to as 'axial plus i'.
 The 'plus i' gives us how much higher we need to go.
 the ridges are the creases that allow go between 'axial plus i' to 'axial plus (i + 1)'.
 This gives us 3 types of creases: (1) hinges, which are orthogonal to the axis, (2) ridges, which connect 'axial plus i' creases, and the family of 'axial plus i' creases.
(Ridge)
(axial+1)/
 /
(axial+0)/
(Hinge)
 If there is only one axis, then it is uniaxial.