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Adobe Acrobat SDK
Multimedia Features (Chapter 9 in PDF Reference)
Adobe® Supplement to the ISO 32000
9.5.6 Persistence of 3D Measurements and Markups 62
3D Measurement/Markup Dictionary
The
MA
entry of
TABLE 9.39 Entries in a 3D view dictionary
contains an array of 3D measurement
dictionaries, where each dictionary represents an instance of a 3D measurement to be displayed in the
context of this view. Each 3D measurement dictionary describes the type of the 3D measurement through
the
Subtype
entry, as well as provides a name for the measurement as it may appear in the user interface
of a conforming reader.
The entries of the 3D Measurement/Markup dictionary are described in the table that follows.
The
TRL
field contains the current name for the measurement markup. Each measurement markup is
assigned a name (“Measurement 1”, “3D Comment 22”, …and so on) when it is created. These names may
be shown by an interactive conforming reader so that users can see what measurements are associated
with what views. Users can override the initially defined names at any point.
TABLE 9.39a Entries in a 3D measurement/markup dictionary
common to all markup subtypes
KEY
TYPE
VALUE
Type
name
(
Optional; ExtensionLevel 3
) The type of PDF object that this dictionary
describes; if present, it shall be
3DMeasure
for a 3D measurement
dictionary.
Subtype
name
(
Required; ExtensionLevel 3
) A name specifying the measurement type
for this measurement:
●
LD3
– A
linear dimension measurement
is used to denote the distance
between two arbitrary points on a 3D model. See
“3D Linear
Dimension Measurement” on page 63
for a listing of additional
entries in this dictionary.
●
PD3
– A
perpendicular dimension measurement
is used to denote the
perpendicular distance between two geometric entities (normally
two lines or a point and a line). See
“3D Perpendicular Dimension
Measurement” on page 65
for a listing of additional entries in this
dictionary.
●
AD3
– An
angular dimension measurement
is used to denote the
angle between two linear entities. See
“3D Angular Dimension
Measurement” on page 67
for a listing of additional entries in this
dictionary.
●
RD3
– A radial dimension measurement is used to define the radius
or diameter of a circular 3D entity. See
“3D Radial Dimension” on
page 71
for a listing of additional entries in this dictionary.
●
3DC
– A 3D comment note lets users connect a comment to a
specific piece of geometry in the 3D model. See
“3D Comment Note”
on page 74
for a listing of additional entries in this dictionary.
TRL
text string
(
Optional; ExtensionLevel 3
) A name string that may be associated with a
measurement markup. If omitted, a conforming interactive viewer may
create one.
Conforming viewers that do not provide a user interface for such
elements should ignore this field.