8

Common Camera Parameters 1221
Inter face
Lens —Sets the camera’s focal length in millimeters.
Use the Lens spinner to give the focal length a
value other than the preset "stock" values on the
buttonsintheStockLensesgroupbox.
When you change the Aperture Width v alue in the
RenderScenedialog,youalsochangethevaluein
the Lens spinner field. This doesn’t change the
view through the camera, but it does change the
relationshipbetweentheLensvalueandtheFOV
value, as well as the aspect r atio of the camera’s
cone.
FOV Direct ion fly out—Lets you choose how to
apply the field of view (FOV) value:
•
Horizontal—(The default.) Applies the
FOV horizontally. This is the standard way to
set and measure the FOV.
•
Vertical—Applies the FOV vertically .
•
Diagonal—Applies the FOV diagonally,
from one corner of the viewport to the other.
FOV —Determines how wide an a rea the camera
views (
field of v iew (page 3–1031) ). When FOV
Direction is horizontal (the default), the FO V
parameter directly sets the arc of the camera’s
horizon (page 3–1047) , measured in degrees. You
can also set the FOV Direction to measure FOV
vertically or diagonally.
You can also adjust the field of view interactively
in a
camera view por t (page 3–788) by using the
FOV button.
Or thogr aphic Proj ection—When on, the camera
view looks just like a User view. When off, the
camera view is the standard perspective-like
view. While Orthog r aphic Project ion is in effect,
the viewport n avigation buttons behave as they
ordinarily do, except for Perspective. Perspective
function sti ll moves the camer a and changes the
FOV, but the Orthographic Projection cancels the
twoout,soyoudon’tseeanychangeuntilyouturn
off Orthographic Projection.