X3D

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For the language's predecessor, see VRML.
X3D should not be confused with 3DXML, which is a proprietary 3D file format.
X3D — Extensible 3D Graphics
Filename extension .x3d, .x3dv (plain text)
.x3db, .x3dz, .x3dbz, .x3dvz (compressed)
Internet media type model/x3d+xml
model/x3d+binary
model/x3d+vrml
Latest release 3.3, 3.2, 3.1, 3.0[when?]
Type of format 3D computer graphics
Extended from VRML, XML
Standard ISO/IEC 19775/19776/19777
Website www.web3d.org/x3d

X3D is a royalty-free ISO standard XML-based file format for representing 3D computer graphics. It is successor to the Virtual Reality Modeling Language (VRML).[1] X3D features extensions to VRML (e.g. CAD, Geospatial, Humanoid animation, NURBS etc.), the ability to encode the scene using an XML syntax as well as the Open Inventor-like syntax of VRML97, or binary formatting, and enhanced application programming interfaces (APIs).

The X3D extension supports multi-stage and multi-texture rendering; it also supports shading with lightmap and normalmap. Starting in 2010, X3D has supported deferred rendering architecture. Now X3D can import SSAO, CSM and Realtime Environment Reflection/Lighting. The user can also use optimizations like BSP/QuadTree/OctTree or culling in the X3D scene.

X3D can work with other open source standards like XML, DOM and XPath.

Standardization

X3D defines several profiles (sets of components) for various levels of capability including X3D Core, X3D Interchange, X3D Interactive, X3D CADInterchange, X3D Immersive, and X3D Full. Browser makers can define their own component extensions prior to submitting them for standardisation by the Web3D Consortium. Formal review and approval is then performed by the International Organization for Standardization (ISO).

Liaison and cooperation agreements are also in place between the Web3D Consortium and the World Wide Web Consortium (W3C), Open Geospatial Consortium (OGC), Digital Imaging and Communications in Medicine (DICOM) and the Khronos Group.

A subset of X3D is XMT-A, a variant of XMT, defined in MPEG-4 Part 11. It was designed to provide a link between X3D and 3D content in MPEG-4 (BIFS).

The abstract specification for X3D (ISO/IEC 19775) was first approved by the ISO in 2004. The XML and ClassicVRML encodings for X3D (ISO/IEC 19776) were first approved in 2005.[2]

Applications

There are several applications, most of them being open-source software,[3] which natively parse and interpret X3D files, including the 3D graphics and animation editor Blender[4] and the Sun Microsystems virtual world client Project Wonderland.[5] An X3D applet is a software program that runs within a web browser and displays content in 3D, using OpenGL 3D graphics technology to display X3D content in several different browsers (IE, Safari, Firefox) across several different operating systems[6] (Windows, Mac OS X, Linux). However, X3D has not received a wider ground of acceptance in other, more notable and proprietary software applications.

In 2000s, many companies like Bitmanagement improved the quality level of virtual effects in X3D to quality level of DirectX 9.0c, but at the expense of using proprietary solutions. All main features like game modeling are already complete. They include multi-pass render with low level setting for Z-buffer, BlendOp, AlphaOp, Stencil,[7] Multi-texture,[8] Shader with HLSL and GLSL support,[9] real-time Render To Texture, Multi Render Target (MRT) and post-processing.[10] Many demos shows that X3D already supports lightmap, normalmap, SSAO, CSM and real-time environment reflection along with other virtual effects.[11]

X3D strives to become the 3D standard for the Web, as integrated in the HTML5 pages as other XML dialects (MathML, SVG) already are there. X3DOM is a proposed syntax model and its implementation as a script library[12] that demonstrates how this integration can be achieved without a browser plugin, using only WebGL and JavaScript.[13]

Example

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE X3D PUBLIC "ISO//Web3D//DTD X3D 3.2//EN"
  "http://www.web3d.org/specifications/x3d-3.2.dtd">
 
<X3D profile="Interchange" version="3.2"
     xmlns:xsd="http://www.w3.org/2001/XMLSchema-instance"
     xsd:noNamespaceSchemaLocation="http://www.web3d.org/specifications/x3d-3.2.xsd">
<Scene>
  <Shape>
    <IndexedFaceSet coordIndex="0 1 2">
      <Coordinate point="0 0 0 1 0 0 0.5 1 0"/>
    </IndexedFaceSet>
  </Shape>
</Scene>
</X3D>

Also see Wikibooks: Computer_Programming/Hello_world/X3D

Alternatives

  • WebGL: JavaScript API for rendering interactive 3D graphics and 2D graphics within any compatible web browser, managed by the Khronos Group
  • 3DMLW: 3D Markup Language for Web
  • COLLADA: interchange file format for interactive 3D applications, managed by the Khronos Group
  • O3D: developed by Google
  • U3D: Ecma International standard ECMA-363
  • VRML: precursor of X3D

See also

References

  1. ^ Paul Festa and John Borland (19 May 2005). "Is a 3D web more than just empty promises?". CNET News.com. Archived from the original on 12 November 2009. 
  2. ^ X3D FAQ – "What is the status of the X3D specification?". Retrieved on November 30, 2007.
  3. ^ "X3D Open Source Projects". Web3d.org. Retrieved 2010-02-23. 
  4. ^ Blender Model Export to X3D
  5. ^ "Project Wonderland". Research.sun.com. 2008-10-07. Retrieved 2010-02-23. 
  6. ^ "X3D applet". Members.shaw.ca. Retrieved 2010-02-23. 
  7. ^ DrawGroup & DrawOp
  8. ^ Multitexturing
  9. ^ Programmable shaders component
  10. ^ Scene postprocessing support
  11. ^ VRML X3D and Realtime Web3D
  12. ^ X3DOM JavaScript library
  13. ^ X3D and HTML5: X3DOM proposal, Web3D wiki

External links

X3D at DMOZ

Authoring support

Example documents of X3D code

Example documents of X3DOM code

General

Documentation