System information
5.  Select the Recompress  edited frames check box if you want to recompress edited  frames in your 
project before previewing. When the check box is cleared,  edited frames will not be passed to your 
preview device.
If you're previewing a project that consists of DV media with no compositing  or transitions, the DV 
will be passed directly to your preview device.  If, however you'd added a 6-frame crossfade, the 
crossfade would be passed  to the preview device only if the check box is selected.
6.  Select the Display   frames in Video Preview window during playback check box if you  want to 
preview on the external monitor and in the Vegas Pro  Video Preview window simultaneously.
When the check box is cleared, video is sent only to the external monitor.
7.  Select the Use  project output rotation setting check box if you're rendering a  rotated project  and 
want to use the Output  rotation setting from the Project Properties dialog for previewing  your 
project.
When the check box is cleared, the media is rotated according to its  Media Properties setting, but 
the Video Preview output is unrotated—you  can use this setting to proof your project on an 
unrotated display.
For more information, see "Creating Rotated Projects" on page 65.
8.  Choose a setting from the  Stereoscopic 3D mode drop-down list if you're working with  a 
stereoscopic  3D project and want to override the project settings for previewing  your stereoscopic 
3D project on an external monitor.
For more information, see "Stereoscopic 3D editing" on page 201 and "Setting up stereoscopic 3D 
previews" on page 205.
Windows Graphics Card
You can also use the Windows Graphics Card  device on a computer with a single monitor. When you 
enable the external  monitor, the video preview will fill your screen.
1.  From the Options menu, choose  Preferences  and then click the Preview Device tab.
2.  From the Device  drop-down list, choose Windows  Graphics Card. The Details box displays 
information about the device.
3.  From the Display  Adapter drop-down list, choose the device where your preview monitor  is 
connected.
You can click the Identify  Displays button to determine which display corresponds to each  setting in 
the drop-down list. A number will be displayed on each monitor.
If the monitor number is displayed in red,  the graphics card does not support 3D acceleration 
or acceleration has  been turned off. You can go to Start > Settings > Control Panel > Display > 
Settings > Advanced > Troubleshoot to turn on acceleration  if your adapter supports it.
4.  Select the Scale  output to fit display check box if you want the video preview to  fill the display.
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