X3D

1
X3D

• Bent Dalgaard Larsen
• _at_imm.dtu.dk

2
Why do we need X3D

• VRML is dead
• VRML is closed. It is not possible to extend
  it.
• Too complicated to implement.
• Many existing implemtation are unstable.
• Eks. Cosmo
• Long live X3D - maybe...
• In principle very easy to implement
• Extensible

3
From VRML to X3D

• VRML
• DEF MyView viewpoint position 0 0 10
• X3D
• ltviewpoint id'MyView' position'0 0 10' gt

4
X3D features

• Be fully backward compatible with VRML 97
• Easily extended
• Open source implementation i C og Java
• Scripting using EAI or DOM just like in ordinary
  HTML

5
Exercise

• Convert a VRML file to X3D

6
Your experience

• HTML
• XML, DTD
• C, C
• STL
• Scenegraph
• Parser
• OpenGL

7
HTML versus XML

• HTML structure, data and layout
• XML Data
• DTD structure
• I assume that everybody knows HTML

8
XML

• ltxxxgt lt/xxxgt
• ltxxx/gt
• Always open and close nested
• One root tag
• Case sensitive

9
DTD

• Show DTD slide
• Show XML example

10
Code

• Example DTD
• Example XML
• Example XML parser
• Example Scene graph
• Example STL
• Example OpenGL