5.0

4. Check the normals check box to reduce the precision of normals.

5. Check the colors check box to reduce the precision of colors.

6. Check the texture coordinates check box to reduce the precision of texture coordinates.

7. Click OK to set these options or Cancel to exit the dialog without setting them.

7.1.3. NWC Files

Cache files (.nwc) are used when reading native CAD files, such as files from AutoCAD or MicroStation.

By default, when JetStream Roamer opens a native CAD file, it first checks in the same directory whether

there is a JetStream cache file present with the same name as the CAD file but with a .nwc extension. If

there is, and this cache file is newer than the native CAD file, then JetStream will open this file instead as

it has already been converted to JetStream format and therefore will open much quicker. If, however,

there is no cache file present, or the cache file is older than the native CAD file, then JetStream will have

to open the CAD file and convert it. At this point, it will by default write 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.

See Section 7.2, “ File Exporters ” for more information on why you might want to use the .nwc file

exporters, which CAD applications you can export from and how.

NWC Options

JetStream allows you to enable and disable the reading and writing of cache files.

This describes the default process. The options here enable you to enable and disable the reading and

writing of cache files. For example, you may want to disable reading cache files to ensure that JetStream

converts every native CAD file each time it is read, even though this is a slower process. Also, you may

want to disable the writing of cache files in order to save on disk space and clutter, even though the

cache files are generally many times smaller than the original native CAD files.

Setting NWC options

1. Go to Tools, Global Options, and select the NWC tab.

The Caching dialog box is displayed.

Converting Files