Perspective and other camera parameters are defined in the Camera Parameters panel, which you can open by clicking on the Camera... button in the Views panel (Figure 28.4.1).
Perspective and Orthographic Views
You may choose to display either an orthographic view or a perspective view of your graphics. To show a perspective view (the default), select Perspective in the Projection drop-down list in the Camera Parameters panel (Figure 28.4.2). To turn off perspective, select Orthographic in the Projection drop-down list.
Modifying Camera Parameters
Instead of translating, rotating, and zooming the display as described in Section 28.4.1, you may sometimes want to modify the "camera'' through which you are viewing the graphics display.
The camera is defined by four parameters: position, target, up vector, and field, as illustrated in Figure 28.4.5. "Position'' is the camera's location. "Target'' is the location of the point the camera is looking at, and "up vector'' indicates to the camera which way is up. "Field'' indicates the field of view (width and height) of the display.
To modify the camera's position, select Position in the Camera drop-down list and specify the X, Y, and Z coordinates of the desired point. To modify the target location, select Target in the Camera drop-down list and specify the coordinates of the desired point. Select Up Vector to change the up direction. The up vector is the vector from (0,0,0) to the specified ( X,Y,Z) point. Finally, to change the field of view, select Field in the Camera list and enter the X (horizontal) and Y (vertical) field distances.
Apply after you change each camera parameter (
Up Vector, and