The Filters menu can be found in the ParaView Menu Bar. When ParaView is initially started with no data, the Filters menu is greyed out. Once there is data in ParaView, this menu becomes available. The Filters menu has four submenus, which can be seen in the second image to the right.
- Recent - lists the most recently used filters, with the most recent at the top of the list.
- Common - lists the most common filters, which are the same as the ones found on the toolbar.
- Data Analysis - lists filters used to derive quantitative information from the data.
- Alphabetical - lists all the filters alphabetically.
When multiple sets of data are read into ParaView, the active data is the one that is highlighted. To make another data set active, simply click on it with the mouse and it will be highlighted. The Filters menu contains a list of filters that can be applied to the active data set. Those filters that are not appropriate for the particular type of active data are greyed out. When a filter is selected for the active data set, several things will happen.
- The Parameters Tab for the filter will be displayed. On this tab are the configurable parameters for the filter. Of particular interest is the Input menu on this tab. This menu allows the user to select what data set to apply the filter to. This can be particularly helpful if there are multiple data sets (such as a time series data sets) and the user wants to see how the same filter affects each data set. It can also be helpful if the wrong data set is currently active, and the user wants to change it to the correct data set.
- If the user is currently in the 3-D View Properties mode, selecting a filter will change the display to the Selection/Navigation window.
- The filter that is selected will become the active data object.
The filter will not be created and displayed until the Accept button (highlighted in green) is accepted. Changing a parameter in the Parameters Tab of the filter will cause the display results to be out-of-date, and the Accept button will again be highlighted. Clicking the Accept button will cause the changed parameters to be applied, and the display will be updated. To reset all the values back to the defaults, press the Reset button. To cancel the filter, press the Delete button.
ParaView has over 80 possible filters. These filters will be described below.