Autodesk 12812-051462-9011 User Guide 3 - Page 2577

available priority setting (in the Adapt Object Display By Priority group) during degradation. Regions Views menu > Viewport Configuration > Viewport Configuration dialog > Regions tab Right-click a viewport label. > Configure > Viewport Configuration dialog > Regions tab On the Regions panel of the Viewport Configuration dialog, you specify default selection rectangle sizes for the Blowup Region and the Sub Region, and the parameters for setting up a virtual viewport. The rectangular selection region appears when you render with either Blowup or Region selected in the Render Type List on page 6095. You can change the size of the region by dragging its handles. The Virtual Viewport options let you zoom in on a sub-region of the current viewport, creating a "virtual viewport" where you can perform any standard navigation, but in a zoomed-in area. This function works only when you're using an OpenGL driver. If you're using the software driver, these controls are disabled. You can use the virtual viewport on any type of viewport, but it's primarily designed for zooming in on camera views. This lets you perform close-up work, such as tracing, without distorting the relationship between the geometry and a bitmap background. (See Lock Zoom/Pan in Viewport Background on page 148 for similar functionality in orthographic views.) Because you're actually zooming the viewport image itself, the viewport label might be hidden from display, but you can still right-click in the upper-left area of the viewport to display the menu. This takes advantage of zooming features in the Open GL driver so that the software does not compute the display change internally. Procedures To use the virtual viewport: 1 Make sure you're using an OpenGL driver on page 7790 for your display. 2 Activate the viewport to convert to a virtual viewport (typically a camera viewport that is displaying a bitmap background). 7832 | Chapter 26 Customizing the User Interface