Table 6.19— DRM_Arc

Property

Description

Superclass

·         <DRM Linear Geometry>

Class

·         <DRM Arc>

Subclass

·         none

Definition

Three locations in space that represent the beginning, mid, and ending points on an <DRM Arc>. The beginning and ending points are the <DRM Vertex>s, and the midpoint is the <DRM Location 3D>.

Example(s)

·         A geometric representation of a treeline, or a string of lights that follow the path of the <DRM Arc> (see <DRM Light Source>).

Inherited field elements

field_name

range

Field_Data_Type

count1

 

Short_Integer_Unsigned

suppress_last2

 

Boolean

Field elements

field_name

range

Field_Data_Type

none

 

 

Associated to (one-way) (inherited)

·         none

Associated to (one-way)

·         none

Associated by (one-way) (inherited)

·         none

Associated by (one-way)

·         none

Associated with (two-way) (inherited)

·         zero or more {ordered} <DRM Geometry Edge>s through <DRM Edge Direction>s

Associated with (two-way)

·         none

Composed of (two-way) (inherited)

·         zero or more {ordered} <DRM Attribute Set Index>

·         zero or one <DRM Classification Data>

·         zero or more {ordered} <DRM Colour>s

·         zero or more {ordered} <DRM Image Mapping Function>s

·         zero or one <DRM Light Rendering Properties>

·         zero or one <DRM Presentation Domain>

·         zero or more <DRM Property Table>

·         zero or more <DRM Property Table Reference>s

·         zero or more <DRM Property Value>s

·         zero or one <DRM Rendering Priority Level>

·         zero or one <DRM Rendering Properties>

·         zero or more <DRM Tack Point>s

·         zero or one <DRM Union Of Primitive Geometry>

Composed of (two-way)

·         exactly (2) {ordered} <DRM Base Vertex>s

·         one <DRM Location>

Composed of (two-way metadata) (inherited)

·         zero or one <DRM Time Constraints Data>

Composed of (two-way metadata)

·         none

Component of (inherited)

·         one or more <DRM Union Of Primitive Geometry>s

Component of

·         none

Constraints

·         Colour mapping restrictions

·         Continuous LOD restrictions

·         Image mapping functions and texture coordinates

·         Nested primitive geometry

·         No attribute conflicts

·         Non-crossing aggregations

·         Non-cyclic aggregations

·         Precedence of Attribute_Set_Index

Notes

1The number of evenly divided segments/points along the linear geometry. The default of 0 indicates that the linear geometry is solid.

2Flag indicating that the last segment/point is suppressed if true.

Class diagram

<DRM Arc>