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809
SECTION 9.5 3D Artwork
KEY TYPE VALUE
N number (Meaningful only if the value of CS is XNF; required if the value of Subtype is P) The near
clipping distance, expressed in the camera coordinate system. No parts of objects whose
z coordinates are less than the value of this entry are drawn. If Subtype is P, the value
must be positive; if Subtype is O, the value must be non-negative, and the default value
is 0.
FOV number (Required if Subtype is P, ignored otherwise) A number between 0 and 180, inclusive,
specifying the field of view of the virtual camera, in degrees. It defines a cone in 3D
space centered around the z axis and a circle where the cone intersects the near clipping
plane. The circle, along with the value of PS, specify the scaling of the projected artwork
when rendered in the 2D plane of the annotation.
PS number (Optional; meaningful only if Subtype is P) An object that specifies the scaling used
or name when projecting the 3D artwork onto the annotation’s target coordinate system. It de-
fines the diameter of the circle formed by the intersection of the near plane and the cone
specified by FOV. The value may be one of the following:
• A positive number that explicitly specifies the diameter as a distance in the annota-
tion’s target coordinate system.
• A name specifying that the diameter must be set to the width (W), height (H), mini-
mum of width and height (Min), or maximum of width and height (Max) of the anno-
tation’s 3D view box. Default value: W.
OS number (Optional; meaningful only if Subtype is O) A positive number that specifies the scale
factor to be applied to both the x and y coordinates when projecting onto the annota-
tion’s target coordinate system (the z coordinate is discarded). Default value: 1.
OB name (Optional; PDF 1.7; meaningful only if Subtype is O) A name that specifies a strategy for
binding (scaling to fit) the near plane’s x and y coordinates onto the annotation’s target
coordinate system. The scaling specified in this entry is applied in addition to the scal-
ing factor specified by the OS entry. The value may be one of the following:
W Scale to fit the width of the annotation
H Scale to fit the height of the annotation
Min Scale to fit the lesser of width or height of the annotation
Max Scale to fit the greater of width or height of the annotation
Absolute No scaling should occur due to binding.
Default value: Absolute.
The CS entry defines how the near and far planes are determined. A value of XNF
means that the N and F entries explicitly specify the z coordinate of the near and
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