Class Name: Geometry Model

Superclass - SEDRIS Abstract Base

Definition

A collection of geometric attributes and the necessary hierarchy and attributes required to build a renderable component of the transmittal. Each Geometry Model is defined as having a single spatial reference frame. Geometry Model Instances are used to transform one Model into the spatial reference frame of another Model or the spatial reference frame of the Environment_Root. A Geometry Model. may be a large and complex as a large terrain model, or as simple as a tank's turret at the lowest level of detail.

Primary Page in DRM Diagram:

• 2

Secondary Pages in DRM Diagram:

• 3
• 7
• 16

Example

1. The representation of the hull of an M1 tank.
2. A Geometry Model representing a missile pointing down the -Z axis. The Geometry Model is aggregated by a Model, which in turn is part of a large Model Library, in which the missiles are expected to point down the positive Y axis. To be consistent with the other Models in the Model Library, the missile's Geometry Model has an LSR Transformation to reorient it to point down the positive Y axis.

FAQs

Why does Geometry Model have an LSR Transformation? Isn't this taken care of by Geometry Model Instance's Transformation component?

Geometry Model has an LSR Transformation to allow all Models in a Model Library to be given a uniform orientation. (Note that the data provider is not required to give them all a uniform orientation.)

Constraints

• No Model CLOD

Associated by (one-way)

• optionally, some Geometry Model Instances

Composed of (one-way)

• optionally, some Attachment Points
• optionally, a LSR Transformation (notes)
• optionally, some Contact Points (notes)

Composed of (two-way)

• one Geometry Hierarchy

Composed of (one-way metadata)

• optionally, an Access
• optionally, some Browse Graphics
• optionally, some Cross References
• optionally, a Data Quality
• optionally, a Keywords
• optionally, a Point of Contact

Component of (two-way)

• one Model

Field Elements

Notes

Composed of Notes

LSR_Transformation

 allows for a standard model orientation

Contact_Point

 allows explicit definition of where
 the model contacts the terrain surface