3D Compositing with Action > Action: FBX Camera > FBX Camera Parameters >

# Film Back Tab

The Film Back options control the basic properties of a camera (for example, the camera's film format: 16mm, 35mm, 70mm).

(a) Film Gate box(b) Film Roll Rotation Order box

Film Gate box
  Select a preset film frame format type. This action automatically sets the corresponding Camera Aperture, Film Aspect Ratio, and Lens Squeeze Ratio. To set these attributes individually, set Film Gate to User. The default setting is User.

Camera Aperture X field
  Displays the width of the camera Film Gate setting, measured in inches. This setting has a direct effect on the camera's angle of view and automatically updates Film Aspect Ratio. Editable.

Camera Aperture Y field
  Display the height of the camera Film Gate setting, measured in inches. This setting has a direct effect on the camera's angle of view and automatically updates Film Aspect Ratio. Editable.

Film Aspect Ratio field
  Displays the ratio of the camera aperture width versus height. Modifying this field automatically updates the Camera Aperture fields. Editable.

Lens Squeeze Ratio field
  Displays the amount horizontal compression that is applied to the image. Used with some cameras (for example, anamorphic cameras), which compress the image horizontally to record a wider aspect ratio image onto a square area on film. Editable.

Film Roll Value field
  Displays the amount of rotation applied to the film back. The rotation occurs around the specified pivot point. Used to compute a film roll matrix, which is a component of the post-projection matrix. Editable.

Film Roll Rotation Order box
  Select how the roll is applied with respect to the pivot value.

  Enable: | To:
  --- | ---
  Rotate-Translate | First rotate the film back, then translate it by the pivot point value.
  Translate-Rotate | First translate the film back, then rotate it by the film roll value.

Pre Scale field
  Displays the artificial 2D camera zoom that is applied before the film roll. Used in 2D effects. Editable.

Post Scale field
  Displays the artificial 2D camera zoom that is applied after the film roll. Used in 2D effects. Editable.

Film Fit Resolution Gate box
  Select the size of the resolution gate relative to the film gate (Film fit). If the resolution gate and the film gate have the same aspect ratio, then the Film Fit setting has no effect.

  Select: | To:
  --- | ---
  Fill | Fit the resolution gate within the film gate.
  Horizontal | Fit the resolution gate horizontally within the film gate.
  Vertical | Fit the resolution gate vertically within the film gate.
  Overscan | Fit the film gate within the resolution gate.

Film Fit Offset field
  Displays the offsets of the resolution gate relative to the film gate either vertically (if Film Fit Resolution Gate is Horizontal) or horizontally (if Film Fit Resolution Gate is Vertical). Film Fit Offset has no effect if Film Fit Resolution Gate is Fill or Overscan. Editable.

Film X Offset field
  Displays the horizontal offset, in pixels, of the resolution gate and the film gate relative to the scene. Changing the Film X Offset produces a two-dimensional track. Editable.

Film Y Offset field
  Displays the vertical offset, in pixels, of the resolution gate and the film gate relative to the scene. Changing the Film Y Offset produces a two-dimensional track. Editable.

Enter: | To:
--- | ---
1 | Have the view guide fill the view. The edges of the view guide may be exactly aligned with the edges of the view, in which case the view guide is not visible.
> 1 | Increase the space outside the view guide. The higher the value, the more space is outside the view guide.

Film X Translate field
  Displays the artificial 2D horizontal camera pan. Used in 2D effects. Editable.

Film Y Translate field
  Displays the artificial 2D vertical camera pan. Used in 2D effects. Editable.

Film Roll X Pivot field
  Displays the horizontal pivot point from the center of the film back, which is used during the rotating of the film back. Used to compute the film roll matrix, which is a component of the post projection matrix. Editable.

Film Roll Y Pivot field
  Displays the vertical pivot point from the center of the film back, which is used during the rotating of the film back. Used to compute the film roll matrix, which is a component of the post projection matrix. Editable.