Display Lists
This subsection describes display lists and shows how to generate them.
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To prevent a decrease in system performance when using display lists we recommend:
• That you only use display lists for fast viewing/windowing on relatively complete drawings.
• You switch the display list off (pick Off in Displ List) if large sections of the drawing are to be changed.
• When display lists are on, do not change the spotlight setting for parts.
• When display lists are on, do not change the show status.
• If you use display lists you should regenerate them regularly to reduce their size to an optimum. To regenerate a display list in the current viewport pick On in Displ List.
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A display list is graphical information that is independent of the main drawing data structure.
Very fast redraw, zoom and pan operations are performed using the data in the display list.
Because display lists can consume large amounts of memory you can specify in which viewport they should be generated.
When you generate a display list in a viewport all further Creo Elements/Direct Drafting drawing operations in that viewport are recorded in the display list.
• The display list reflects all existing geometry.
• All new, deleted or changed geometry will cause the display list to grow.
For example, if you create a white line, the white line is appended to the end of the display list. If you later delete this line, an additional line in the background color of the viewport will be drawn on the screen to erase the original white line. This additional line also is appended to the end of the display list.
You can see how much memory is used for the display list and how much is "wasted" on deleting elements. Two numbers are displayed in the lower left corner of the viewport. The left number is the total size of the display list in bytes. The right number is the size in bytes of the part of the display list used for deleting.
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The display list numbers only appear in viewports that have display list selected.
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When the right number (memory used for deleting) becomes large, meaning that large portions of the display list have been used to remove or change elements, you should regenerate the display list. To generate or regenerate a display list in a viewport:
1. Press the WINDOW menu title bar.
2. Pick On in Displ List.
You can now perform drawing operations. To keep the size of the display list small, regenerate it regularly by picking On in Displ List.