2009

.nwc Cache Files
When any native CAD file file is opened or appended, NavisWorks
creates a cache file (.nwc) if the write cache option is set. When the file
is next opened or appended, NavisWorks will read data from the
corresponding cache file rather than re-converting the original data if the
cache is newer than the original file. If the original file is altered,
NavisWorks will re-create the cache file when it is next loaded. Cache
files speed up access to commonly used files. They are particularly
useful for models made up of many files of which only a few are changed
between viewing sessions. Cache files can also be exported from some
CAD applications where a native file reader is not available with
NavisWorks. Cache options can be edited from the Global Options
dialog box under the Tools menu.
.nwd Published Data Files
Published .nwd files are useful when wanting to take a snapshot of the
model at a certain time. All the geometry and review information is saved
into the .nwd file and cannot then be changed. Published .nwd files can
also contain information about the file, as well as being able to be
password protected and time-bombed for security. These files are also
very small, compressing the CAD data by up to 80% of the original size.
Published .nwd files are useful when issuing models for viewing by
others with the NavisWorks Freedom free viewer, as well as being
appendable themselves into NavisWorks to build up a larger scene.
.nwf Review Files
Review files are useful when using the native CAD files appended into
NavisWorks. They store the location of the appended files, along with
any design reviews made in NavisWorks, such as comments, redlines,
viewpoints, animations and so on.
If a group of files is appended into a NavisWorks scene, and saved as an
.nwf file, then on re-opening this .nwf file later, once the original CAD
files have been changed, the updated CAD files will be loaded into the
scene for review.
External References
External references (sometimes called reference files or "XRefs") are
shown in NavisWorks selection tree as an inserted group. NavisWorks
looks for the externally referenced files in the same place as AutoCAD or
MicroStation would.
If the Unresolved XRef dialog box is shown, then this link has somehow
been broken and the referenced files need to be relocated to where
AutoCAD or MicroStation would expect them to be.
If these XRefs are not important for the current session, then you can
Ignore the reference and the file will load without that XRef inserted.
Similarly, Ignore All will load the file without any unresolved XRefs.
You can also use the DWG/DXF and DGN options in the Tools, Global
Options dialog to set whether external references are loaded or not,
giving you more control over file appending into NavisWorks.
Faceting Factor
During an export from a CAD package to .nwc, or while NavisWorks is
reading a native CAD file, decisions must be made as how a curved
Glossary
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