Autodesk 12812-051462-9011 User Guide 3 - Page 2551

viewport is visible, but doesn't have to redraw when multiple viewports are visible. Default=off. ■ Redraw In UnMaximized Viewports If, after updating the screen, the display card destroys the back buffer when multiple viewports are visible, turn on this sub-option. Default=off. Allow Dual Plane Support Uses the front/back plane system when redrawing the viewport. The selected object is manipulated in the front plane and is redrawn, while other objects remain on the back plane and are not redrawn. This default setting provides the fastest redraws under normal circumstances. If your assigned display driver doesn't support dual planes, this option is not available. Turn off this setting to improve redraw speed if you are rotating the whole scene or moving a camera through the scene (usually situations in which the whole viewport needs to be redrawn anyway). Use Incremental Scene Updates Redraws only those scene objects that have changed, or that intersect a region changed by another moving object. When off, the entire scene is redrawn for each new frame. Default=on. If the display becomes messy or "corrupted" as a result of incremental updates, turn this option off and then redraw viewports by choosing Views > Redraw All Views (the default keyboard shortcut for this is 1 on the numeric keypad). Appearance Preferences group Enable Antialiased Lines in Wireframe Views Draws lines slightly thicker and much smoother. This is best used for wireframe-only views, especially if you're making a preview of wireframe objects. Background Texture Size Unlike the software display driver, which uses bitmaps to display viewport backgrounds directly, the Direct3D driver uses a texture-mapped background rectangle. This allows for smoother zooms and pans in orthographic views and can take less memory than the direct bitmap method. However, background bitmap resolution may be lost. Increase the resolution if you're using a maximized viewport to digitize. Match Bitmap Size as Closely as Possible Displays background at full resolution. This allows the viewport to behave like the Rendered Frame Window on page 6073, in regards to zoom and pan. Default=off. Download Texture Size Lets you choose the size of the texture map that's downloaded to the driver for texture-mapped scene objects. Larger maps look better, but use more display card memory. 7806 | Chapter 26 Customizing the User Interface