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(its local positive Y axis) to be as close as possible to the world positive Z axis.
This is no problem when you are working with a static camera. However, if
you animate the camera and put it in a nearly vertical position, either up or
down, the program flips the Camera view to prevent the up-vector from
becoming undefined. This creates sudden changes of view.
Camera Object Icons
Camera objects are visible in viewports unless you choose not to display them.
However, the geometry that appears in the viewport is only an icon meant to
show you where the camera is located and how it is oriented.
Target cameras on page 5205 create a double icon, representing the camera (a
blue box intersecting a blue triangle) and the camera target (a blue box).
Free
cameras
on page 5203 create a single icon, representing the camera and its field
of view.
A free camera has no target. A target camera has a target sub-object.
You cannot shade camera objects. However, you can render their icons using
Animation menu > Make Preview and turning on Cameras in the Display In
Preview group.
The display of camera object icons is not scaled when you change the scale
of the viewport. When you zoom in on a camera, for example, the icon size
does not change. To change the size of camera object icons, you can use the
Viewports panel on page 7753 of the Preferences dialog, and change the value
of Non-Scaling Object Size.
Cameras | 5197