Mikä on X3D-tiedosto?

X3D is an XML based 3D graphics file format for presentation of 3D information. It is a modular standard and is defined through several ISO specifications. The format supports vector and raster graphics, transparency, lighting effects, and animation settings including rotations, fades, and swings. It became successor of VRML file format in 2001. X3D:n etuna on väritietojen koodaus (toisin kuin {{HYPERLINKKI}}), jota käytetään tulostettaessa mallia värillisellä 3D-tulostimella. Muoto sisältää VRML-laajennuksia, jotka tarjoavat mahdollisuuden koodata kohtaus käyttämällä XML-syntaksia sekä Open Inventor -tyyppistä VRML97-syntaksia tai binaarimuotoilua.

The abstract specification for X3D (ISO/IEC 19775) was first approved by the ISO in 2004. X3D:n XML- ja ClassicVRML-koodaukset (ISO/IEC 19776) hyväksyttiin ensimmäisen kerran vuonna 2005.

X3D tiedostomuoto

X3D-näkymätiedostoilla on yhteinen tiedostorakenne:

  • Tiedoston otsikko (joko XML, ClassicVRML tai Compressed Binary)

  • X3D-juurisolmun alku, mukaan lukien versio- ja profiiliattribuutit

  • Pääosa, jossa on komponentti- ja metalausekkeet (molemmat valinnaiset)

  • X3D Scene -kaavio ja sen lapsisolmut

  • X3D-juurisolmun loppu

Esimerkki X3D-tiedostomuodosta 

<!-- -------------------- X3D header and X3D root node with profile declaration -->
<!DOCTYPE X3D PUBLIC "ISO//Web3D//DTD X3D 3.2//EN"
                     "http://www.web3d.org/specifications/x3d-3.2.dtd">
<X3D profile#'Immersive' version#'3.2'
     xmlns:xsd#'http://www.w3.org/2001/XMLSchema-instance'
     xsd:noNamespaceSchemaLocation#'http://www.web3d.org/specifications/x3d-3.2.xsd'>

<!-- -------------------- head section with included meta data -->
  <head>
    <meta content#'HelloWorld.x3d' name#'title'/>
    <meta content#'Simple X3D example' name#'description'/>
    <meta content#'30 October 2000' name#'created'/>
    <meta content#'7 August 2010' name#'modified'/>
    <meta content#'Don Brutzman' name#'creator'/>
    <meta content#'http://www.web3D.org' name#'reference'/>
    <meta content#'http://x3dGraphics.com' name#'reference'/>
    <meta content#'http://www.web3d.org/x3d/content/examples/HelloWorld.x3d' name#'identifier'-fi/>
    <meta content#'http://www.web3d.org/x3d/content/examples/HelloWorldTall.png' name#'image'/>
    <meta content#'http://www.web3d.org/x3d/content/examples/license.html' name#'license'/>
    <meta content#'X3D-Edit 3.2, https://savage.nps.edu/X3D-Edit' name#'generator'/>
  </head>

<!-- -------------------- the X3D scene node with X3D nodes -->
  <Scene>
    <!-- Example scene to illustrate X3D nodes and fields (XML elements and attributes) -->
    <Group>
      <Viewpoint centerOfRotation#'0 -1 0' description#'Hello world!' position#'0 -1 7'/>
      <Transform rotation#'0 1 0 3'>
        <Shape>
          <Sphere/>
          <Appearance>
            <Material diffuseColor#'0 0.5 1'/>
            <ImageTexture url#'"earth-topo.png" "earth-topo.jpg" "earth-topo-small.gif"
     "http://www.web3d.org/x3d/content/examples/Basic/earth-topo.png"
     "http://www.web3d.org/x3d/content/examples/Basic/earth-topo.jpg"
     "http://www.web3d.org/x3d/content/examples/Basic/earth-topo-small.gif"'/>
          </Appearance>
        </Shape>
      </Transform>
      <Transform translation#'0 -2 0'>
        <Shape>
          <Text string#'"Hello" "world!"'>
            <FontStyle justify#'"MIDDLE" "MIDDLE"'/>
          </Text>
          <Appearance>
            <Material diffuseColor#'0.1 0.5 1'/>
          </Appearance>
        </Shape>
      </Transform>
    </Group>
  </Scene>

<!-- -------------------- footer, closing X3D toot element -->
</X3D>

Viitteet

See Also