Validate your model that contains multi-layered anisotropic composite media, by
viewing the principal direction.
On the 3D View
contextual tabs set, on the Mesh tab, in the
Rendering group, click the Orientation icon. From the drop-down list select the Layer icon.
Each face that has an anisotropic layer applied to is listed on the
Anisotropic layer settings dialog.
Note: An anisotropic
layer is applied to a label.
For each face, you can select the Show principal
direction check box and specify the Layer
number to show the direction in the 3D view.