Select a camera in the list (where you see "None" right now) which
contains all the cameras you may have previously created. The camera
commands are activated:
|Note that if the camera you selected is a
cylindrical camera (i.e. the lens type is "parallel"), only the
first two commands will be activated because the Manipulate
Focal command only applies to
(i.e. with a "perspective" lens).
If you want to position yourself behind
the camera and observe the captured image, click Camera Window
a new window displaying the camera viewpoint is opened. When you
manipulate the handler in this window, the camera is simultaneously
positioned in the main window.
You can choose three arrangements for the opened
windows, i.e. horizontal, vertical and cascading by selecting the
following commands from the menu bar:
- Window > Tile Horizontally
- Window > Tile Vertically
- Window > Cascade.
|Example of vertical tiling
|Once the Camera Window command is
activated, the icon turns from
To deactivate the command and
close the camera window, you can either click the cross in the
top-right corner of the window or reselect Window > Camera
Window > Camera x.
To adjust (i.e. center) the camera when
the viewpoint is modified, click Update from View
Do not forget that each time the viewpoint is modified, you need to click
Update from View to re-adjust the camera.
Click Manipulate Focal
to modify the focal length (i.e. the distance between the camera origin
and the viewing plane) directly in the 3D viewer.
A green circle appears with an arrow indicating the
current focal length in millimeters as shown below:
|You can then drag the green arrow clockwise to
increase the focal length or anticlockwise to decrease it.
When you drag the arrow, the value in millimeters is updated and
the focal length changes accordingly.
The position of the camera origin is also modified
simultaneously (the camera moves backward or forward) so that the
model always fits into the camera field of view. Therefore, the
perspective is modified without having to zoom in or out
|The focal length can also be defined via the
camera properties in the
tab. If you access the Properties dialog box, you see
that the value displayed in the viewer matches the one displayed in
the Focal Length box.
Activating the Manipulate
Focal command also keeps the Update from View
command activated (the icon turns
this means that the camera is automatically updated each time the
viewpoint is modified. There is no need to click Update from
View after each modification of the viewpoint.
|To exit the Manipulate Focal command,