Graphics Programs Reference
In-Depth Information
Figure9.25
System filters
When you select any of the existing filters, certain categories have been
selected. These are the categories for the items you want to have affected
by the filter. Next, notice under Filter Rules that, by default, System
Classification is selected. Because of the large number of filters typically
created for a project, you should change the Filter By setting from System
Classification to System Abbreviation. This helps identify and separate your
systems properly.
If you try to use the default System Classification, soon you will find its
limitations. The mechanical supply air system rule is set to System
Classification to contain supply. This may not be a problem for small
projects, but for larger ones that could have multiple supply systems, it
won't work. This limitation is especially obvious when you have piping
systems with numerous supply and return systems and distinguishing
between all of them is critical. System Abbreviation has the necessary
flexibility to allow for distinguishing hundreds of systems.
To create new system filters, the easiest method is to select an existing
system filter and then click the Duplicate icon. After the system filter is
duplicated, make sure the proper category elements are selected and then
rename the filter rule to the name by which you want to filter.
When you are finished creating new filters or modifying existing ones, click
OK to get back to the Filters tab in the Visibility/Graphic Overrides dialog
box. Click Add. This brings up the filters that you have created, so select
those that are needed in the current view of your project. After the filters are
