SECTION 9.5
817
3D Artwork
3D Lighting Scheme Dictionaries
A
3D lighting scheme dictionary
(PDF 1.7) specifies the lighting to apply to 3D
artwork. The
LS
entry in the 3D view can include a 3D lighting scheme dictio-
nary.
TABLE 9.44 Entries in a 3D lighting scheme dictionary
KEY
TYPE
VALUE
Type
name
name
(Optional)
The type of PDF object that this dictionary describes; if
present, must be
3DLightingScheme
.
(Required)
The style of lighting scheme described by this dictionary
(see
).
Subtype
Artwork
lighting style, all the lights specified below are
infinite
lights (also known
as
distant
lights). Unlike lights from a point source, all rays from an infinite light
source are emitted along a single direction vector. For lights specifying an
ambi-
ent
term, this term is added to the diffuse color of an object’s material. All colors
are specified in the
DeviceRGB
color space.
When a style other than
Artwork
is used, only those lights described should be
present; any lighting described in the artwork should not be used.
TABLE 9.45 3D lighting scheme styles
SCHEME
DESCRIPTION
Artwork
Lights as specified in the 3D artwork. This has the same effect as if the
3D lighting scheme dictionary were omitted.
No lights are used. That is, lighting specified in the 3D artwork is
ignored.
Three blue-grey infinite lights, no ambient term
Light 1
Color: < 0.38, 0.38, 0.45 > Direction: < -2.0, -1.5, -0.5 >
Light 2
Color: < 0.6, 0.6, 0.67 > Direction: < 2.0, 1.1, -2.5 >
Light 3
Color: < 0.5, 0.5, 0.57 > Direction: < -0.5, 0.0, 2.0 >
None
White