Visualizing High-Order Symmetric Tensor Field Structure with Differential Operators

Figure 20

Saddles are indicated by concavity of the Lamb divergence.

(a) Order 3 Source

(b) Order 3 Vortex

(c) Order 3 Saddle

(d) Order 4 Source

(e) Order 4 Vortex

(f) Order 4 Saddle