X3D JSON example

HelloWorldCommentedAlternativeEncoding.json

{ "X3D": {
    "@profile":"Immersive",
    "@version":3.3,
    "@xsd:noNamespaceSchemaLocation":"http://www.web3d.org/specifications/x3d-3.3.xsd",
    "head": {
        "meta": [
          {
            "@name":"title",
            "@content":"HelloWorldCommented.x3d"
          },
          {
            "@name":"description",
            "@content":"Numerous comments added to simple X3D scene example for testing JSON encoding alternatives."
          },
          {
            "@name":"created",
            "@content":"19 December 2015"
          },
          {
            "@name":"modified",
            "@content":"19 December 2015"
          },
          {
            "@name":"creator",
            "@content":"Don Brutzman"
          },
          {
            "@name":"reference",
            "@content":"HelloWorldCommentedOriginalEncoding.json"
          },
          {
            "@name":"reference",
            "@content":"HelloWorldCommentedAlternativeEncoding.json"
          },
          {
            "@name":"identifier",
            "@content":"http://X3dGraphics.com/examples/X3dForAdvancedModeling/HelloWorldScenes/HelloWorldCommented.x3d"
          },
          {
            "@name":"license",
            "@content":"http://www.web3d.org/x3d/content/examples/license.html"
          },
          {
            "@name":"generator",
            "@content":"X3D-Edit 3.3, https://savage.nps.edu/X3D-Edit"
          }
        ]
    },
    "Scene": {
        "-children":[
          { "#comment":"Example scene to illustrate comments interspersed among X3D nodes and fields (XML elements and attributes)"},
          { "#comment":"WorldInfo begin"},
          { "WorldInfo":
            {
              "@title":"Hello world!"
            }
          },
          { "#comment":"WorldInfo complete, Group begin"},
          { "Group":
            {
              "-children":[
                { "#comment":"Viewpoint begin"},
                { "Viewpoint":
                  {
                    "@DEF":"ViewUpClose",
                    "@centerOfRotation":[0,-1,0],
                    "@description":"Hello world!",
                    "@position":[0,-1,7]
                  }
                },
                { "#comment":"Viewpoint complete, Transform begin"},
                { "Transform":
                  {
                    "@rotation":[0,1,0,3],
                    "-children":[
                      { "#comment":"Shape begin"},
                      { "Shape":
                        {
                          "-children":[
                            { "#comment":"Sphere begin"},
                            { "#comment":"Sphere complete, Appearance begin"},
                            { "#comment":"Appearance complete"}
                          ],
                          "-geometry":[
                            { "Sphere":
                              {
                              }
                            }
                          ],
                          "-appearance":[
                            { "Appearance":
                              {
                                "-children":[
                                 { "#comment":"Material begin"},
                                 { "#comment":"Material complete, ImageTexture begin"},
                                 { "#comment":"ImageTexture complete"}
                                ],
                                "-material":[
                                  { "Material":
                                    {
                                      "@DEF":"MaterialLightBlue",
                                      "@diffuseColor":[0.1,0.5,1]
                                    }
                                  }
                                ],
                                "-texture":[
                                  { "ImageTexture":
                                    {
                                      "@DEF":"ImageCloudlessEarth",
                                      "@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"]
                                    }
                                  }
                                ]
                              }
                            }
                          ]
                        }
                      },
                      { "#comment":"Shape complete"}
                    ]
                  }
                },
                { "#comment":"Transform complete, Transform begin"},
                { "Transform":
                  {
                    "@translation":[0,-2,0],
                    "-children":[
                      { "#comment":"Shape begin"},
                      { "Shape":
                        {
                          "-children":[
                            { "#comment":"Text begin"},
                            { "#comment":"Text complete, Appearance begin"},
                            { "#comment":"Appearance complete"}
                          ],
                          "-geometry":[
                            { "Text":
                              {
                                "@DEF":"TextMessage",
                                "@string":["Hello","world!"],
                                "-children":[
                                  { "#comment":"FontStyle begin"},
                                  { "#comment":"FontStyle complete"}
                                ],
                                "-fontStyle":[
                                  { "FontStyle":
                                    {
                                      "@justify":["MIDDLE","MIDDLE"]
                                    }
                                  }
                                ]
                              }
                            }
                          ],
                          "-appearance":[
                            { "Appearance":
                              {
                                "-children":[
                                  { "#comment":"Material begin"},
                                  { "#comment":"Material complete"}
                                ],
                                "-material":[
                                  { "Material":
                                    {
                                      "@USE":"MaterialLightBlue"
                                    }
                                  }
                                ]
                              }
                            }
                          ]
                        }
                      },
                      { "#comment":"Shape complete"}
                    ]
                  }
                },
                { "#comment":"Transform complete"}
              ]
            }
          },
          { "#comment":"Group complete"}
        ]
    }
  }
}

index.js

'use strict';
const fs = require('fs');

fs.readFile(
	'HelloWorldCommentedAlternativeEncoding.json',
	'utf8',
	(error, code) => {
		const data = JSON.parse(code);
		console.log(data.X3D.Scene['-children'][4].Group['-children'][3].Transform['-children'][1].Shape['-appearance'][0].Appearance['-material'][0].Material['@diffuseColor']);
	}
);