You display the Configure Driver dialog from the Viewports page of the Preferences dialog on the File menu. It contains options for configuring your specific driver.
Driver options take effect immediately and persist between sessions, but data downloaded to the graphics card is not regenerated. If you change texture resolution, for example, the hardware uses the old resolution values until you reload the texture through Medit.
The dialog options vary, depending on the driver. Options for custom drivers are dependent on their manufacturers. See the custom driver manufacturer's documentation for further information.
The options are the same for HEIDI and Direct 3D drivers.
Redraw Scene On Window Expose: Redraws the whole scene when a dialog over the viewports is moved, resulting in smoother dragging of the Materials Editor or Trackview dialogs, for example. If your display is corrupted, select this item or force a redraw with the “1” key macro.
Use Triangle Strips: “Stripifies” the geometry, which can more than double display speed. In some cases, such as when topology is constantly changed, the time taken to stripify the geometry can cause a slowdown instead. In such cases, clear this option. Otherwise, leave it selected for speed.
64/128/256/512: Lets you specify the size of the bitmaps used to map the surfaces in the viewports. The larger the size, the better the resolution, but the slower the speed. High speed produces jagged maps, and slower speeds produce smooth maps.
Redraw Scene On Window Expose: Redraws the whole scene when a window over the viewports is moved, resulting in smoother drags of the Medit, Trackview or VideoPost windows. If your display is corrupted, select this item or force a redraw with the “1” key macro.
Interactive Incremental Scene Updates: Redraws only those scene objects that have changed, or that intersect a region changed by another moving object. When clear, the entire scene is redrawn for each new frame. If your display is corrupted, select this item or force a redraw with the “1” key macro.
Allow Dual Plane Support: Uses dual planes, if that option is set in the Preferences/Viewport page. If clear, dual planes are never used, regardless of other settings.
Use Triangle Strips: "Stripifies" all geometric data before sending it to the driver. In some cases, such as when topology is constantly changed, the time taken to stripify the geometry can cause a slowdown instead. In such cases, clear this option. Otherwise, leave it selected for speed.
Anti-Aliased Lines: Draws lines slightly thicker and much smoother. This is best used for wireframe-only views, and especially if you are making a preview of wireframe objects.
Background Texture Size: Unlike the HEIDI driver, which uses bitmaps to display viewport backgrounds directly, the OpenGL driver uses a texture-mapped background rectangle. This allows for smoother zooms and pans in ortho views and can take less memory than the direct bitmap method. However, background bitmap resolution may be lost. Increase the resolution if you are using a maximized viewport to digitize.
Download Texture Size: Lets you choose the size of the texture map that is downloaded to the driver for texture-mapped scene objects. Bigger maps may look better, but they take up more space on the display card.
Texel Lookup: Specifies whether to use the nearest pixel or to linearly interpolate the pixel value from the four closest texels. Using the nearest pixel is faster, but using texels produces a higher-quality display.
Mipmap Lookup: Specifies whether to use one version of the texture map ("none") or to interpolate between a pyramid of progressively smaller maps. With "nearest," the texel lookup is done on the map level nearest the ideal one, and with "linear," the texel values from the two closest map levels are interpolated.
With both Texel and Mipmap lookup set to linear, a true trilinear weighting of 8 texel values is used for a single pixel display. This is very accurate and helps eliminate aliasing, but it may be time-consuming on unaccelerated texture-mapping hardware.