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Predominant values of the principal curvatures for various classes of shapes.
| Class of shape | c1 | c2 |
|---|---|---|
| 1. Tubular | > 0 | = 0 |
| 2. Canal surface | > 0 | = 0 |
| 3. Branched | > 0 | = 0 |
| 4. Disc like | ||
| a. On the rim | > 0 | = 0 |
| b. Region enclosed by rim | = 0 | = 0 |
| 5. Inner tubes | ||
| a. Exterior side | > 0 | = 0 |
| b. Interior side | = 0 | < 0 |
