CATIA V5 import options (Windows only)

Import NURBS: If this option is checked on, curve, surface, shell, and solid geometry data in CATIA is imported as NURBS in Alias. The default is on.
Keep Topology: If this option is checked on (default), CATIA skins are converted to Alias shells. Otherwise, they are converted to a collection of trimmed surfaces.
Shrink Surfaces: If this option is checked on, Alias detects trimmed surfaces whose trim boundaries are the same as, or iso-parametric to, the natural boundaries of the untrimmed surface. It then converts these surfaces into Alias surfaces by shrinking the untrimmed surface to the trim boundaries.

When checked off (default), Alias converts all trimmed surfaces of this type to Alias trimmed surfaces.
Import Cloud Data: If this option is checked on, CATIA cloud mesh data (which is generally scan data) is converted to Alias mesh data. The default if on.
Import Weld Data: If this option is checked on, CATIA weld data (assembly joints) is converted to NURBS data in Alias. The default if on.
Import Meshes: If this option is checked on, tessellated data associated to a part in CATIA (that is, the graphical representation of the geometry data in CATIA) is converted to meshes in Alias. The default if off.

Note
In general, you do not want to import both NURBS and Mesh data, as they are different representations of the same objects.
Keep Color: This option only appears when Import Meshes is on. If checked on, the color for each face of tessellated data is preserved. The default if on.
Merge Vertices: This option only appears when Import Meshes is on. If checked on, all coincident vertices (within tolerance) in a mesh (tessellated data) are merged, and normals are averaged at the merged vertices. The default if off.
Tolerance: This option only appears when Merge Vertices is on. Vertices that are within this distance of each other are merged.
Import By Layer: If this option is checked on, the geometrical sets are converted to layers. The default if on.
Import invisible: If this option is checked on, CATIA invisible (not datum) entities are converted to Alias invisible entities.

If checked off (-v option specified for C5ToAl), CATIA invisible (hidden) entities are ignored and are not converted. This is the default.
Import infinite: If this option is checked on, CATIA entities which are considered as having an infinite geometry (for example, lines, planes) are imported into Alias.

If checked off (-x option specified for C5ToAl), CATIA infinite entities are ignored and are not imported. This is the default.
Logfile Output: If checked on, a report containing a list of path names of imported file(s), and a list of warning and/or error messages will be produced. This options is off by default.