Look
View the Scene in Perspective
Use the Look option to view the data in perspective (facing north). You select the point from which to look and then fly north.
To avoid flying through surfaces, check the Do not fly through surfaces check box (under the Graphics : Input section of the Tools > Preferences option). You can also select to Invert mouse Y direction, which means as you move the mouse down, the plane will go up and vice versa.
The Perspective factor at near plane value, which specified through the Graphics : Effects section of the Tools > Preferences option), is set by default to 0.01. This setting minimises the effects of distortion on objects when they are close to triangle facets. However, this setting may not be suitable in this mode. A more suitable setting in this case would be 0.001. In general you should try settings between the 0.01 and 0.001.
Instructions
On the View menu, point to Change View, and then click Look.
Select the position from which to look. When selecting the position, you can use Snap to Objects 
or Snap to Points 
mode to 'snap' onto a specific point in an object, or you can use the Indicate mode 
to pick any position at the current Z value. See the Digitise toolbar for details on these modes.
When the point is selected, the view displays in perspective (facing north) and the following over-head display (known as the "throttle display") 
is shown. Refer to the View Point Walk option for instructions on how to use the throttle display.
Use the Esc key to exit the option.
