**The following article is ©2013 Siemens Product Lifecycle Management Software Inc. Reprinted with permission. **
To see the original article, go here- you will need an active webkey to view.
When you zoom into a small area on a large shaded part it is quite common to see curved edges that display similar to those in the image below. They are commonly referred to as “The Jaggies” and at first glance do not appear to be smooth edges. This is because of the tessellation settings that have been applied to the view, or the part, and are based on the Shaded View Face Scale View Preferences. A common question that we are asked at GTAC is how to improve the display.
NX9 has a new View Preference called Facet Scale. By default, this value is set to Part and the size of the tessellations are based on the size of the part. Therefore, as in the example above, you would expect the edges of a small hole to have large tessellations when the overall part is very large.
This is to prevent unwanted view updates (which in the past may have caused a user to have to wait while the view updated). This is also by design and a manual view update can always be completed by right clicking the graphics display and choosing Update Display. The other two Facet Scale options, View and Fixed, provide behavior that pre-NX9 users are familiar with.
The View option will update the tessellations based on the current view scale and Fixed is based on the Resolution Tolerance preference found beneath the Facet Scale preference. The quality of all three Facet Scale options can be adjusted by choosing a different Resolution, which by default is set to Standard. This can be controlled further using the Refinement Factor found beneath the Resolution pull down.
Using these options to improve the resolution may prevent you having to use Update Display frequently (an issue that was noted earlier on) but it should be noted that although increasing the Resolution improves the display, performance may be impacted as the number of facets in the display has increased and NX has to shade each of the facets.
If a view does not update following a manual view update, check to see if the Facet Scalehas been set to Fixed. The only way to improve the tessellations in this case is to increase the Resolution or the Refinement. If Facet Scale is set to View or Part check to see if the Update preference for the currently selected Facet Scale has been set to None.
Another enhancement in NX9 is the ability to cache and save display facets within the part. This option to Save Display Facets is found in the Visualization Performance Preferences and is enabled by default. In NX9, select File->All Preferences->Visualization Performance.
Please refer to the What’s New in NX9.0 Documentation for more information on the enhancements mentioned in this article.