About the Camera Commands Toolbar

This task describes the Camera Commands toolbar functionalities aimed at manipulating cameras more easily.
Open the Lamp.CATProduct document.
  This task assumes that at least one camera has been created as explained in Creating a Camera.

The Camera Commands toolbar is displayed by default under the Menu bar when accessing the Real Time Rendering 2 workbench:

  Some of the commands available in this toolbar can also be accessed from the menu bar or by right-clicking the camera in the specification tree then selecting the corresponding contextual command:

Camera toolbar

Contextual command/Menu item

Camera Window (default) Window > Camera Window menu item
Camera Window Window > Camera Window menu item
Update from View Update from View contextual command
Manipulate Focal No contextual command or menu item


  1. 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 conical cameras (i.e. with a "perspective" lens).
  2. 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 .

    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.

  3. 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.

    Picture 1 - Camera with starting viewpoint Picture 2 - Camera after viewpoint modification

    If you want the camera to be adjusted automatically each time the viewpoint is changed, double-click Update from View (which turns ). To go back to the standard update mode, just click the icon again.
    Another method to adjust automatically the camera is to access the camera properties then select the Update Camera from View option.

  4. 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 afterwards.

    The focal length can also be defined via the camera properties in the Lens 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, click .