=Paper=
{{Paper
|id=None
|storemode=property
|title=Declarative 3D Use Case for Creating a Web3D Public Outreach Timeline Using an X3D Scene
|pdfUrl=https://ceur-ws.org/Vol-869/Dec3D2012_LT_03.pdf
|volume=Vol-869
}}
==Declarative 3D Use Case for Creating a Web3D Public Outreach Timeline Using an X3D Scene==
<pdf width="1500px">https://ceur-ws.org/Vol-869/Dec3D2012_LT_03.pdf</pdf>
<pre>
                              Declarative 3D use case for creating a
                    Web3D public Outreach timeline using an X3D scene

                 Anita Havele                                          Don Brutzman
                 anita.havele@web3d.org                                brutzman@nps.edu
                 Web3D Consortium                                      Naval Postgraduate School
                 California, USA                                       California, USA

Abstract                                                This is an important use case for Declarative 3D that
Declarative 3D needs to include a use case for public   can     help      illustrate    capabilities      while
outreach models that serve as both good demos and       comparing/contrasting      tradeoffs   of      different
good exemplars for authors.       This demonstration    approaches. Our objective here is to take an initial
shows how to structure a Web3D timeline scene using     outreach scene using prototypes, showing the
X3D Prototypes. We will also explore the evolution      strengths and weaknesses of X3D implementation
(or perhaps simplification) of this scene using the     interoperability. We will then modify this scene to
X3DOM        environment    and     declarative   3D    run in the X3DOM environment as a way to analyze
functionality.                                          the limitations of various Declarative 3D and
Categories and Subject Descriptors                      imperative 3D approaches.       We hope to identify
I.3.6 [Methodology and Techniques]: Standards|Lan-      several advantages and disadvantages. A well-defined
guages; I.3.7 [Computer Graphics]: Three-               use case for Declarative 3D will likely result from
Dimensional Graphics and Realism|Virtual Reality.       feedback from the group.
Keywords                                                2. X3D Prototype Design [1]
X3D, X3D Prototypes, X3DOM, Web3D, Declarative          X3D Prototypes provide a way for X3D authors to
3D.                                                     create new nodes that can be repeated in the X3D
1. Introduction                                         scene graph. X3D Prototypes or PROTOS are
With recent developments in declarative 3D for the      wrapped inside an X3D Scene node. Prototypes have
HTML environment, it is important to have good          a special mandatory structure. A Prototype begins
examples that show how things work.                     with a ProtoDeclare, which is the initial declaration
                                                        of its name. After that, node fields are described
Copyright notice:                                       inside the ProtoInterface. The final content is then
Copyright © 2012 for the individual papers by the       implemented inside the ProtoBody node. Via the
papers' authors. Copying permitted only for private     IS/connect statement, nodes and fields from the proto
and academic purposes. This volume is published and
                                                        interface are connected and linked to those in the
copyrighted by its editors. Dec3D2012 workshop at
WWW2012, Lyon, France                                   proto body.
Prototypes are preferred if initialization values are            Interchange profile. The goal is provide declarative
needed,   like     in    this   Web3D        timeline   scene.   XML-based X3D scenes support for HTML to script
ProtoInstance allows repeated reuse of a new node                and partition the content from the DOM/HTML side.
which was used to define each event in this timeline             5. Demo: Web3D Timeline Scene using X3D
scene. Prototypes are a powerful technique for                   Prototype [3]
extending the capabilities of X3D. Few computing                 In this section we will describe the true X3D scene
languages provide authors with the capability to                 created using X3D Prototype that demonstrate the
extend the core vocabulary of the language itself.               capabilities and extensibility of X3D.
Whether     such        capabilities   are     essential   for
Declarative 3D remains to be seen.


3. Basic X3D Prototype Structure [4]
<!DOCTYPE X3D PUBLIC "ISO//Web3D//DTD
X3D 3.0//EN"
"http://www.web3d.org/specifications/x3d-3.0.dtd">
<X3D version='3.0'>                                              6. Demo: Web3D Timeline scene using X3DOM
  <Scene>                                                        In this section we will describe the Web3D timeline
    <ProtoDeclaration name="MyNewNode">                          scene created using X3DOM functionality.
       <ProtoInterface>                                          7. Conclusion
          <field name="myNewField"                               This section will discuss the challenges and design
accessType="inputOutput" value="" />                             constrains in adapting theWeb3D time line X3D
       </ProtoInterface>                                         scene to the X3DOM environment.
       <ProtoBody>                                               8. References
          <!-- content implementation -->                        [1] Extensible 3D Graphics for Web Authors
       </ProtoBody>                                              (http://www.x3dgraphics.com/)
    </ProtoDeclaration>                                          [2] Web3D Outreach Examples
  </Scene>                                                       http://www.web3d.org/x3d/content/examples/Basic
</X3D>                                                           /Outreach/
                                                                 [3] Web3D Timeline Scene
                                                                 http://www.web3d.org/x3d/content/examples/Basic/O
4. Basic X3DOM Profile                                           utreach/Web3dTimeline.x3d
X3DOM present a model that allows to directly                    [4] X3D Prototype Tutorial
integrate X3D nodes into HTML DOM content.                       http://doc.instantreality.org/tutorial/creating-custom-
X3DOM uses the HTML Profile to extend the X3D-                   nodes-with-prototypes/

</pre>