SECTION 9.5
805
3D Artwork
KEY
TYPE
VALUE
C2W
array
(Required if the value of
MS
is
M
, ignored otherwise)
A 12-element 3D transfor-
mation matrix that specifies a position and orientation of the camera in world
coordinates.
(Required if the value of
MS
is
U3D
, ignored otherwise)
A sequence of one or
more text strings used to access a
view node
within the 3D artwork. The first
string in the array is a
node ID
for the
root view node,
and each subsequent
string is the node ID for a child of the view node specified by the prior string.
Each view node specifies a 3D transformation matrix (see Section 9.5.4, “Coor-
era-to-world matrix.
Note:
The use of an array value for this entry is deprecated. A single text string
(corresponding to the View Node name, as described in section 9.5.4.1 of the Uni-
versal 3D File Format specification) is sufficient to determine the world matrix of
the target view node. See implementation note 157 in Appendix H.
Note:
Do not confuse
View Nodes
with
nodes.
A
View Node
is a parameter in
the 3D artwork that specifies a view, while a
node
is a PDF dictionary that speci-
fies 3D graphic objects or collections thereof.
U3DPath
text string or
array
CO
number
(Optional; used only if
MS
is present)
A non-negative number indicating a dis-
tance in the camera coordinate system along the
z
axis to the center of orbit for
this view; see discussion below. If this entry is not present, the viewer applica-
tion must determine the center of orbit.
(Optional)
A
projection dictionary
(see “Projection Dictionaries” on page 808)
that defines the projection of coordinates in the 3D artwork (already trans-
formed into camera coordinates) onto the target coordinate system of the anno-
tation.
Default value: a projection dictionary where the value of
Subtype
is
Perspective
, the value of
FOV
is 90, and all other entries take their default val-
ues.
P
dictionary
O
stream
(Optional; meaningful only if
MS
and
P
are present)
A form XObject that is used
to overlay 2D graphics on top of the rendered 3D artwork (see Section 9.5.5,
(Optional)
A
background dictionary
that defines the background over which the
3D artwork is to be drawn (see “3D Background Dictionaries” on page 812”).
Default value: a background dictionary whose entries take their default values.
BG
dictionary