{ "X3D": {
    "encoding":"UTF-8",
    "@profile":"Immersive",
    "@version":"3.1",
    "@xsd:noNamespaceSchemaLocation":"https://www.web3d.org/specifications/x3d-3.1.xsd",
    "JSON schema":"https://www.web3d.org/specifications/x3d-4.0-JSONSchema.autogenerated.json",
    "head": {
        "meta": [
          {
            "@name":"title",
            "@content":"PerFrameNotificationECMAScript.x3d"
          },
          {
            "@name":"description",
            "@content":"This example shows how to use per-frame notification to produce a frame rate output in the Browser console"
          },
          {
            "@name":"creator",
            "@content":"X3D Specification"
          },
          {
            "@name":"translator",
            "@content":"Xeena VRML importer"
          },
          {
            "@name":"translated",
            "@content":"23 February 2005"
          },
          {
            "@name":"modified",
            "@content":"20 October 2019"
          },
          {
            "@name":"subject",
            "@content":"X3D ECMAScript Script Authoring Interface (SAI)"
          },
          {
            "@name":"identifier",
            "@content":"https://www.web3d.org/x3d/content/examples/Basic/ScriptConformance/PerFrameNotificationECMAScript.x3d"
          },
          {
            "@name":"reference",
            "@content":"https://www.web3d.org/x3d/specifications/ISO-IEC-19777-1-X3DLanguageBindings-ECMAScript/Part1/examples.html#PerFrameNotification"
          },
          {
            "@name":"generator",
            "@content":"Vrml97ToX3dNist, http://ovrt.nist.gov/v2_x3d.html"
          },
          {
            "@name":"generator",
            "@content":"X3D-Edit 3.3, https://www.web3d.org/x3d/tools/X3D-Edit"
          },
          {
            "@name":"license",
            "@content":"../license.html"
          },
          {
            "@name":"translated",
            "@content":"20 April 2026"
          },
          {
            "@name":"generator",
            "@content":"X3dToJson.xslt, https://www.web3d.org/x3d/stylesheets/X3dToJson.html"
          },
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            "@name":"reference",
            "@content":"X3D JSON encoding: https://www.web3d.org/wiki/index.php/X3D_JSON_Encoding"
          }
        ]
    },
    "Scene": {
        "-children":[
          { "WorldInfo":
            {
              "@title":"PerFrameNotificationECMAScript.x3d"
            }
          },
          { "Script":
            {
              "@DEF":"SC",
              "#sourceCode":[
"",
"",
"ecmascript:",
"",
"var lastStartTime;",
"",
"function initialize() {",
"    date = new Date();",
"    lastStartTime = date.getTime();",
"}",
"",
"// Called each frame",
"function prepareEvents() ",
"{",
"    date = new Date();",
"    frameTime = (date.getTime() - lastStartTime) / 1000.0;",
"    lastStartTime = date.getTime();",
"    fps = 1.0 / frameTime;",
"    Browser.println('FPS: ' + fps);",
"}",
"",
""
]
            }
          }
        ]
    }
  }
}