Kas ir X3D fails?

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 priekšrocība ir krāsu informācijas kodēšana (atšķirībā no STL), kas tiek izmantota, drukājot modeli ar krāsu 3D printeri. Formātā ir VRML paplašinājumi, kas nodrošina iespēju kodēt ainu, izmantojot XML sintaksi, kā arī Open Inventor līdzīgu VRML97 sintaksi vai bināro formatējumu.

The abstract specification for X3D (ISO/IEC 19775) was first approved by the ISO in 2004. XML un ClassicVRML kodējumi X3D (ISO/IEC 19776) pirmo reizi tika apstiprināti 2005. gadā.

X3D faila formāts

X3D ainas failiem ir kopīga failu struktūra:

  • Faila galvene (XML, ClassicVRML vai saspiests binārs)

  • X3D saknes mezgla sākums, ieskaitot versijas un profila atribūtus

  • Galvas sadaļa ar komponentu un meta paziņojumiem (abi nav obligāti)

  • X3D ainas grafiks un tā pakārtotie mezgli

  • X3D saknes mezgla beigas

X3D faila formāta piemērs 

<!-- -------------------- 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'-lv/>
    <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>

Atsauces Nr.

See Also