{ "X3D": {
    "encoding":"UTF-8",
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    "JSON schema":"https://www.web3d.org/specifications/x3d-4.0-JSONSchema.autogenerated.json",
    "head": {
        "meta": [
          {
            "@name":"title",
            "@content":"HeadsUpDisplayExample.x3d"
          },
          {
            "@name":"description",
            "@content":"Prototype definition that demonstrates use of a simple HeadsUpDisplay (HUD) prototype that maintains a stable position for its children on the screen."
          },
          {
            "@name":"creator",
            "@content":"Leonard Daly and Don Brutzman"
          },
          {
            "@name":"created",
            "@content":"15 July 2006"
          },
          {
            "@name":"modified",
            "@content":"20 October 2019"
          },
          {
            "@name":"reference",
            "@content":"HeadsUpDisplayPrototype.x3d"
          },
          {
            "@name":"reference",
            "@content":"https://X3dGraphics.com"
          },
          {
            "@name":"reference",
            "@content":"https://www.web3d.org/x3d/content/examples/X3dResources.html"
          },
          {
            "@name":"rights",
            "@content":"Copyright 2006, Daly Realism and Don Brutzman"
          },
          {
            "@name":"subject",
            "@content":"X3D book, X3D graphics, X3D-Edit, http://www.x3dGraphics.com"
          },
          {
            "@name":"identifier",
            "@content":"https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter14Prototypes/HeadsUpDisplayExample.x3d"
          },
          {
            "@name":"generator",
            "@content":"X3D-Edit 3.3, https://www.web3d.org/x3d/tools/X3D-Edit"
          },
          {
            "@name":"license",
            "@content":"../license.html"
          },
          {
            "@name":"translated",
            "@content":"17 April 2026"
          },
          {
            "@name":"generator",
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          },
          {
            "@name":"reference",
            "@content":"X3D JSON encoding: https://www.web3d.org/wiki/index.php/X3D_JSON_Encoding"
          }
        ]
    },
    "Scene": {
        "-children":[
          {
            "#comment":"Simple Heads-Up Display (HUD) Prototype\\n \\n Manages the display of a HUD and maintains its position on the screen.\\n Changes to fieldOfView (in Viewpoint node) will change screen position\\n \\n Fields:\\n hudSize Size of HUD (initializeOnly - SFVec3f) default=\"1 1 .01\"\\n hudColor Color of HUD (inputOutput - SFColor) default=\"1 1 1\"\\n screenOffset Offset of HUD. This field positions the HUD on the display screen (inputOutput - SFVec3f) default=\"0 0 0\"\\n hudGeometry Geometry to be placed on the HUD. Origin is center of HUD. (inputOutput - MFNode) default = []\\n position_changed Current viewer location (outputOnly - SFVec3f)\\n orientation_changed Current viewer orientation (outputOnly - SFRotation)\\n \\n \\n"
          },
          { "WorldInfo":
            {
              "@title":"HeadsUpDisplayExample.x3d"
            }
          },
          { "ExternProtoDeclare":
            {
              "@name":"HeadsUpDisplay",
              "@appinfo":"Heads-up display (HUD) keeps child geometry aligned on screen in a consistent location",
              "@url":["HeadsUpDisplayPrototype.x3d#HeadsUpDisplay","https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter14Prototypes/HeadsUpDisplayPrototype.x3d#HeadsUpDisplay","HeadsUpDisplayPrototype.wrl#HeadsUpDisplay","https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter14Prototypes/HeadsUpDisplayPrototype.wrl#HeadsUpDisplay"],
              "field": [
                {
                  "@name":"screenOffset",
                  "@accessType":"inputOutput",
                  "@appinfo":"offset position for HUD relative to current view location, default 0 0 -5",
                  "@type":"SFVec3f"
                },
                {
                  "@name":"children",
                  "@accessType":"inputOutput",
                  "@appinfo":"X3D content positioned at HUD offset",
                  "@type":"MFNode"
                },
                {
                  "@name":"position_changed",
                  "@accessType":"outputOnly",
                  "@appinfo":"HUD position update (in world coordinates) relative to original location",
                  "@type":"SFVec3f"
                },
                {
                  "@name":"orientation_changed",
                  "@accessType":"outputOnly",
                  "@appinfo":"HUD orientation update relative to original location",
                  "@type":"SFRotation"
                }
              ]
            }
          },
          { "Background":
            {
              "@DEF":"SandyShallowBottom",
              "@groundAngle":[0.05,1.52,1.56,1.5707],
              "@groundColor":[0.2,0.2,0,0.3,0.3,0,0.5,0.5,0.3,0.1,0.3,0.4,0,0.2,0.4],
              "@skyAngle":[0.04,0.05,0.1,1.309,1.570],
              "@skyColor":[0.8,0.8,0.2,0.8,0.8,0.2,0.1,0.1,0.6,0.1,0.1,0.6,0.1,0.25,0.8,0.6,0.6,0.9]
            }
          },
          { "Viewpoint":
            {
              "@description":"Heads-up display (HUD)"
            }
          },
          {
            "#comment":"ProtoDeclare is the \"cookie cutter\" template, ProtoInstance creates an actual occurrence"
          },
          { "ProtoInstance":
            {
              "@name":"HeadsUpDisplay",
              "@DEF":"HeadsUpDisplayInstance",
              "-children":[
                {
                  "#comment":"example: upper left-hand corner of screen (x=-2, y=1) and set back z=-5 from user view"
                }
              ],
              "fieldValue": [
                {
                  "@name":"screenOffset",
                  "@value":[-0.75,1,-5]
                },
                {
                  "@name":"children",
                  "-children":[
                    { "Shape":
                      {
                        "-geometry":
                          { "Text":
                            {
                              "@string":["HUD text stays fixed","while user navigates"],
                              "-fontStyle":
                                { "FontStyle":
                                  {
                                    "@justify":["MIDDLE","MIDDLE"],
                                    "@size":0.3
                                  }
                                }
                            }
                          },
                        "-appearance":
                          { "Appearance":
                            {
                              "-material":
                                { "Material":
                                  {
                                    "@diffuseColor":[0.894118,0.819608,1]
                                  }
                                }
                            }
                          }
                      }
                    }
                  ]
                }
              ]
            }
          },
          { "Inline":
            {
              "@url":["../HelloWorld.x3d","https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/HelloWorld.x3d","../HelloWorld.wrl","https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/HelloWorld.wrl"]
            }
          }
        ]
    }
  }
}