Requirements Analysis Review

	Modeling Team
	Matt Weyant
	26 Oct 1999

Goals

	Create model of airplane and its components
	Develop API for virtually navigating the airplane model
	Provide API for graphically manipulating “Stickies”
	Build a web-based navigation tool

What is this model?

	CAD-generated 3D model
	Data structure is a component tree

View of Model (rendered)

Functional Requirements

	Provide navigation methods for navigation through a 3D model of an airplane and its components
	Provide location information in a 3D coordinate system for the airplane and its components
	Map locations (x,y,z) to specific parts of the airplane and back

Functional Requirements, cont…

	Locate Stickies associated with components or the whole airplane
	Provide a GUI and manipulation methods for Stickies in a Sticky database owned by Workflow

Nonfunctional Requirements

	User interface and human factors
	Documentation
	Hardware considerations
	Performance characteristics
	Error handling and extreme conditions
	System interface
	Quality issues

Nonfunctional Requirements, cont...

	System modifications
	Physical environment
	Security issues
	Resources issues

User Interface and Human Factors

	Web-based user interface
		Built on API’s
		Intuitive
		Restricted access
	Access rights
		Web users will have “read” access to database
		View/navigate through existing data

Documentation

	Describe features and operation of Web-based navigation tool
		Help pages
		Demos
	Javadoc of implementation
	Extensive additional docs available to other subsystems

Hardware Considerations

	Large storage space
	Lots of memory
	Graphics acceleration not available
	Web availability on remote machine

Performance Characteristics

	Real time requests
		AR
		Authoring
	Non-real time requests
		Workflow
	Java3D

Error Handling and Extreme Conditions

	Error Handling
		Method calls between subsystems
		Dialogue with Web user
		Examples
	Extreme Conditions
		Multiple uses on same CPU
		Memory shortage

System Interface

	Augmented Reality
	Maintenance/Workflow
	Authoring

Augmented Reality
System Interface

	AR’s event-based model
		AR publishes a Vector event with a reference to an empty frame
		Modeling fills the frame and returns it
	API holds methods for rotating, translating and scaling that view
	Web-UI will use AR’s event- and UI-model

Maintenance/Workflow
System Interface

	Modeling provides API for Sticky manipulation
		Place
		Remove
		Review
		Modify
	Must interface with Sticky database owned by Workflow

Authoring
System Interface

	Same methods provided to Authoring as AR
	Generate IETMs using these methods

Quality Issues

	System overload
	Another system unavailable
	Accurate output for given input
	Platform-independent

System Modifications

	Extending system for some other weapons system
	Abstract Factory pattern means minimal changes

Physical Environment

	Never comes in contact with physical surroundings

Security Issues

	Shared memory
		Each subsystem must limit access
	Data encryption to prevent “eavesdropping”

Resources Issues

	No permanent Workflow data
	Navigation information must be stored

Constraints

	Platform-independence
	Speed of Java
	Together/J

System Model

	Scenarios
	Use case models
	Object models
	Dynamic models
	Navigational paths and screen mockup

Scenarios
System Model

	Inspection
	Repair
	Browser

Use Case Models
System Model

NavigateComponent Use Case
Use Case Models

	NavigateComponent
		Actors: Authoring, AR, RemoteUser
		Entry: Actor wants to view/manipulate model
		Flow of Events
			1.  Request entry of system if not already in
			2.  Call method to use for model manipulation
			3.  Exit system if done
		Exit: Actor is done manipulating model
		Special Requirements: Is system on local machine? Speed?

Object Models
System Model

Dynamic Models
System Model

Slide 30

Navigational Text
System Model

	NavigateComponent Sequence Diagram
		Actor initializes display of the model; a wireframe is returned.
		Actor could draw components of the model; a new wireframe is returned.
		Actor could rotate and zoom model/components; a new wireframe is returned.

Screen Mockup
System Model

Questions?