2011

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 customize the options for the DWG/DXF and DGN file readers in the Options Editor to set whether
external references are loaded or not. This gives you more control over file appending into Autodesk Navisworks.
faceting factor During an export from a CAD package to NWC format, or while Autodesk Navisworks is reading
a native CAD file, decisions must be made as how a curved surface is reduced to flat facets. For most applications
and file formats, you have control over the level of faceting that takes place.
All items, no matter what their size, will use the same faceting factor and so have the same number of sides to
curved entities. Therefore, you need to experiment a little with different values to account for the size that these
items will appear on screen.
The faceting factor must be greater or equal to 0, where 0 results in the faceting factor being turned off. The
default value is 1, if you double the value you get twice the number of facets, if you halve the value you get half
as many facets. Larger faceting factors will result in more polygons to a model and larger Autodesk Navisworks
files. There is little point having a large faceting factor if these curved entities are golf balls viewed from 200
yards!
For AutoCAD exports, the faceting factor is set from the NWCOPT command. MicroStation's faceting factor is
set from Options, which is available from the NWCOUT export dialog. To set the faceting factor on reading CAD
files go to the Options Editor (click ➤ Options, expand the File Readers node, and choose the relevant file
reader page).
max facet deviation Maximum facet deviation is used in conjunction with faceting factor to ensure that larger
objects, with too large a deviation from the original, have additional facets added. If a difference greater than
the entered value is found in a model it adds more facets. The values are measured in the model units.
Where “d” is greater than the maximum faceting deviation value, more facets are added to the object.
If the max faceting deviation is set to 0, then this function is ignored and just the faceting factor is used.
published data files (NWD) 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 Autodesk Navisworks Freedom
2011 free viewer, as well as being appendable themselves into Autodesk Navisworks to build up a larger scene.
review files (NWF) Review files are useful when using the native CAD files appended into Autodesk Navisworks.
They store the location of the appended files, along with any design reviews made in Autodesk Navisworks, such
as comments, redlines, viewpoints, animations and so on.
If a group of files is appended into a Autodesk 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.
shape merge threshold MicroStation shapes are polygons that can have 3 or more vertices. They’re often used
to model more complex objects which can waste memory. So, Autodesk Navisworks merges all shapes on the
same level or in the same cell and with the same color into a “Shape Set” if these shapes have less than or equal
to the number of vertices given by the Shape Merge Threshold.
Selection Terminology
These are terms specific to Autodesk Navisworks that are used in relation to selecting items.
478 | Glossary