2012

NWC Page
Use the options on this page to manage reading and writing of cache files
(NWC).
By default, when Autodesk Navisworks opens a native CAD file (for example,
AutoCAD or MicroStation), it first checks in the same directory whether there
is a cache file present with the same name as the CAD file but with an .nwc
extension. If there is, and this cache file is newer than the native CAD file,
then Autodesk Navisworks opens this file instead as it has already been
converted to Autodesk Navisworks format and, therefore, opens much quicker.
If, however, there is no cache file present, or the cache file is older than the
native CAD file, then Autodesk Navisworks has to open the CAD file and
convert it. By default, it writes a cache file in the same directory and with the
same name as the CAD file, but with the .nwc extension, for speeding up the
opening of this file in future.
Caching
Read Cache Select this check box to use cache files when Autodesk Navisworks
opens native CAD files.
Clear this check box if you don’t want to use cache files. This ensures that
Autodesk Navisworks converts native CAD files each time they are opened.
Write Cache Select this check box to save cache files when native CAD files
are converted. Generally, cache files are much smaller than original CAD files,
therefore, selecting this option does not take up too much disk space.
Clear this check box if you don’t want to save cache files.
Geometry Compression
Enable Select this check box to enable geometry compression when NWC
files are saved.
Geometry compression results in less memory being required and therefore
smaller NWC files.
Reduce Precision
Coordinates Select this check box to reduce the precision of coordinates.
Precision Specifies the precision value for coordinates. The larger the value,
the less precise coordinates are.
Normals Select this check box to reduce the precision of normals.
302 | Chapter 13 Reference