BELLS
 Bells can have many different shapes
– Some examples from around the world
 How to capture these shapes ?
– In a parameterized form,
– so that we can “morph” between them?
 Start with simple symmetrical shape
Use Rotational Symmetry
 Start with a piece of a sphere:
Use Rotational Symmetry
 Add a lip at bottom rim (torus piece):
Parametrization
 What variables are most useful?
R1
R3
a1
R2
a2
Need to calculate dependencies! (R3)
Another “Assembly”
 Add an intermediate cone
 Turn bottom rim inward
 Optional Affine stretching
A Different Approach
 Use a rotational sweep
Bezier
Curve
Profile
Another Sweep
 Sweep a circle of varying radius
along a straight path.
Subdivision Surface
 Start with polyhedral approximation