CHAPTER 9
814
Multimedia Features
KEY
TYPE
VALUE
AC
array
(Optional)
An array that specifies the
auxiliary color
to be used
when rendering the 3D image. The first entry in the array is a color
space; the subsequent entries are values specifying color values in
that color space. The interpretation of this entry depends on the
render mode specified by the
Subtype
entry, but it is often used to
specify a color for drawing points or edges.
The only valid color space is
DeviceRGB
. If a color space other
than
DeviceRGB
is specified, this entry is ignored and the default
value is used.
Default value:
[/DeviceRGB 0 0 0]
representing the color black.
FC
name or
array
(Optional)
A name or array that specifies the
face color
to be used
when rendering the 3D image. This entry is relevant only when
Subtype
has a value of
Illustration
.
If the value of
FC
is an array, the first entry in the array is a color
space and the subsequent entries are values specifying values in that
color space. The only valid color space is
DeviceRGB
. Any color
space other than
DeviceRGB
is ignored and the default value is
used.
If the value of
FC
is a name, it should describe a color. The only val-
id name value is
BG
, specifying the current background color in use
for displaying the artwork. If a name other than
BG
is encountered,
this entry is ignored and the background color for the host annota-
tion is used (see Table 8.40 on page 642).
Default value:
BG
O
number
(Optional)
A number specifying the opacity of the added transpar-
ency applied by some render modes, using a standard additive
blend.
Default value: 0.5
CV
number
(Optional)
A number specifying the angle, in degrees, to be used as
the
crease value
to be used when determining silhouette edges. If
two front-facing faces share an edge and the angle between the nor-
mals of those faces is greater than or equal to the crease value, then
that shared edge is considered to be a silhouette edge.
Default value: 45