7. Autodesk - ADI 4.2 Display Drivers
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Highlight Mode
Controls how the BP appears on the screen.
•
Patt Line displays the BP using dotted lines to form the outer bounding box and the
zoom crosshairs.
•
XOR Rect uses a contrasting rectangle to display the BP.
•
The Both option use a combination of Patt Line and XOR Rect to distinguish the BP.
BP Refresh
In its fastest mode, TurboDLD
Classic does not refresh the BP until a DLDREFRESH
command is issued. Depending on a drawing's complexity, the BP could become
confusing in this mode, displaying vectors that are actually erased, and no longer part of
the drawing. To configure the BP to be updated as objects are drawn or erased, enable
the BP Refresh. If speed is a major concern, disable it.
BP Cache
Enables or disables TurboDLD
Classic's internal memory cache for BP functions. This
cache speeds up BP operations on some graphics platforms, primarily on TIGA-based
graphics boards. For this reason, the BP Cache is normally disabled. As a reference, on
VGAs, the performance benefit of the BP Cache is as little as 1%. With a TIGA-based
graphics board, however, the performance benefit of the BP Cache is as high as 400%.
Expert Configuration
The Expert Configuration menu sets the function of TurboDLD
Classic itself. This menu
allows for customization of the driver for speed or to adjust for memory constraints.
Display List
Enables or disables the display list feature of TurboDLD
Classic. This option should
always be set to enable since disabling the Display List causes TurboDLD
Classic to run
as an ordinary non-display list driver.
Drawing Cache
Enables or disables TurboDLD
Classic's internal drawing cache, a compressed list of the
current viewport, which speeds up pans, zooms, and redraws. As in the Display List
option, Drawing Cache should normally be enabled. In low memory situations, it may be
desirable to disable the Drawing Cache. Disabling the drawing cache frees up memory
for AutoCAD but may or may not have a visible effect on your ZOOM and PAN
performance. For example, on VGAs, the performance benefit of the drawing cache is
as little as 5%. With a TIGA-based graphics board, however, the performance benefit of
the drawing cache is as high as 400%.
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