Induced edge singularities
¨
Y
X
d
unstretchable
To avoid stretching,
Border Y of bent
region must extend
straight to edge
Dominant energy
E prefers minimum dihedral angle
a:
E ~
a
7/3
a
d = 0
end view
bottom
smallest
a
least energy
strong curvature:
induced vertex...
induced vertex
Þ
sharp edge
large d
imposed foci
generate
further foci
