Class Name: Polygon

Superclass - <Surface Geometry>

Subclasses

Definition

An instance of this DRM class specifies a bounded portion of a plane, defined by a set of three or more <Vertex> components listed in counterclockwise order. The final segment connecting the last <Vertex> component to the first <Vertex> component is implicit, not explicit. That is, the first <Vertex> component is not duplicated to also appear as the last <Vertex> component of the <Polygon> instance.

Primary Page in DRM Diagram:

• 5

Secondary Pages in DRM Diagram:

• 13

Example

1. A <Polygon> instance represented by multiple subfaces each of which are other <Polygon> instances is depicted in Figure 6.38.

   

   Figure 38 — <DRM Polygon> polygon subfacing example

   The resulting DRM objects are depicted in Figure 6.39.

   

   Figure 39 — <DRM Polygon> example

   In processing these subfaces, the traversal and drawing order of the DRM objects is depth first.

FAQs

No FAQs supplied.

Constraints

• <<Publishable Object>>
• <<Constraints On Components>>
• <<Non Cyclic Aggregations>>
• <<Precedence of Property Set Index>>
• <<Property Constraints>>
• <<Colour Mapping Constraints>>
• <<Continuous LOD Constraints>>
• <<Image Mapping Functions and Texture Coordinates>>
• <<Nested Primitive Geometry>>
• <<Presentation Domain Constraints>>
• <<Polygon As Bounded Plane>>

Associated with (two-way)

• a bounded set of 0..2 {ordered} <Geometry Face> instances¹

Composed of (two-way) (inherited)

• zero or one <Classification Data> instance
• zero or more {ordered} <Property Set Index> instances
• zero or more <Property Table> instances
• zero or more <Property Table Reference> instances
• zero or more <Property Value> instances
• zero or more <Colour> instances
• zero or more {ordered} <Image Mapping Function> instances
• zero or one <Light Rendering Properties> instance
• zero or one <Presentation Domain> instance
• zero or one <Rendering Priority Level> instance
• zero or one <Rendering Properties> instance
• zero or more <Tack Point> instances
• zero or one <Union Of Primitive Geometry> instance²

Composed of (two-way)

• zero or one <Polygon Control Link> instance³
• zero or more <Reference Vector> instances
• 3 or more {ordered} <Vertex> instances

Composed of (two-way metadata) (inherited)

• zero or one <Time Constraints Data> instance

Component of (two-way) (inherited)

• zero or more <Union Of Primitive Geometry> instances

Component of (two-way)

• zero or more <Polyhedron> instances

Inherited Field Elements

Field Elements

Notes

Associated with Notes

Geometry_Face

Composed of Notes

Union_Of_Primitive_Geometry

EXAMPLE  A <Polygon> instance can be decomposed into multiple <Polygon> instances representing subfaces.

Polygon_Control_Link

Fields Notes

polygon_flags

The polygon_flags field specifies the set of SE_Polygon_Flag members applicable to the <Polygon> instance. For a <Polygon> instance with a <Polygon Control Link> component X, the value of the polygon_flags field is obtained from X.