SECTION 9.5
799
3D Artwork
3D Animation Style Dictionaries
A
3D animation style dictionary
(PDF 1.7) specifies the preferred method that
viewer applications should use to apply timeline scaling to keyframe animations.
It can also specify that keyframe animations be played repeatedly. The
AN
entry
of the 3D stream can specify a 3D animation style dictionary.
A keyframe animation can be provided as the content of a 3D stream dictionary.
A keyframe animation provides key frames and specifies the mapping for the po-
sition of geometry over a set period of time (animation
timeline).
Keyframe ani-
mation is an interactive feature that is highly dependent on the behavior and
controls provided by the viewer application.
TABLE 9.36 Entries in an 3D animation style dictionary
KEY
TYPE
VALUE
Type
name
name
(Optional). The type of PDF object that this dictionary describes; if present, must
be
3DAnimationStyle
.
(Optional) The animation style described by this dictionary; see Table 9.37 for
valid values. If an animation style is encountered other than those described in
None
is used.
Default value:
None
Subtype
PC
integer
(Optional) An integer specifying the play count for this animation style. A non-
negative integer represents the number of times the animation is played. A nega-
tive integer indicates that the animation is infinitely repeated. This value is ig-
nored for animation styles of type
None
.
Default value: 0
TM
number
(Optional) A positive number specifying the time multiplier to be used when
running the animation. A value greater than one shortens the time it takes to play
the animation, or effectively speeds up the animation. This allows authors to ad-
just the desired speed of animations, without having to re-author the 3D artwork.
This value is ignored for animation styles of type
None
.
Default value: 1