BELLS

1
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

2
Use Rotational Symmetry

• Start with a piece of a sphere

3
Use Rotational Symmetry

• Add a lip at bottom rim (torus piece)

4
Parametrization

• What variables are most useful?

R1
R3
a1
R2
a2
Need to calculate dependencies! (R3)
5
Another Assembly

• Add an intermediate cone
• Turn bottom rim inward
• Optional Affine stretching

6
A Different Approach

• Use a rotational sweep

Bezier Curve Profile
7
Another Sweep

• Sweep a circle of varying radius along a straight
  path.

8
Subdivision Surface

• Start with polyhedral approximation