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Filtering data during the loading process. |
To access this dialog:
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From the Project File control bar, load a data file in to a data window, using either drag-and-drop or the file's context menu, while pressing the <CTRL> key.
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Drag and drop and file from your operating system into any active 3D window the <CTRL> key held down.
The Object Filter dialog is used to
define Data Field, Coordinate Fields, Control Fields and Filter settings
for a loaded Datamine file.
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The Object Filter dialog's contents will vary according to the type of file that is being loaded, although the overall structure and layout will be the same. The top section of the window shows a File Description and will report the following information:
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Field Details:
Data Fields: select (or clear) any of the available check boxes to control which columns of data will be loaded. You can also select All of the items, or None.
Coordinate Fields: incoming geometry-inclusive files (points, strings, block models, wireframes, etc.) contain coordinate values to allow the data to be represented in 3D space. The standard coordinate fields/columns for each Datamine file type are automatically detected. Other custom fields/columns can be selected from the drop-downs if they contain suitable coordinate information. This feature can be used for example, when a 2D/3D file contains multiple sets of coordinate fields, each one for a different coordinate system.
PVALUE: for a strings file, the PVALUE of a data item (a row within the incoming table) represents the individual string that a given point belongs to. Select a field from the drop-down list to determine the data column used to form point-string relationships. As with coordinate fields, standard database descriptions such as 'PVALUE' will be automatically applied if they exist within the data to be loaded.
PTN: for a strings file, each string contains a series of points/vertices; this value is held within the incoming table data as a sequence of numbers, the standard Datamine field/column is PTN. This drop-down list can be used to select a custom field in which this point sequence data is stored.
Filter: any logical expressions used to filter the incoming data can be defined here. Click the Expression Builder... button to display the Expression Builder dialog.
Filtering uses logical comparisons for which the answer may be TRUE (1) or FALSE (0). If the item of data being tested is TRUE to the selection criteria then it will be accepted, but if it is FALSE, it will be rejected.
Filter arguments may be applied to the selection of records from files or to the selection of data by attributes in the different data windows.
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Related Topics |
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