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    "head": {
        "meta": [
          {
            "@name":"title",
            "@content":"ExtrusionCrossSectionExampleTorus.x3d"
          },
          {
            "@name":"creator",
            "@content":"Don Brutzman"
          },
          {
            "@name":"created",
            "@content":"31 August 2003"
          },
          {
            "@name":"modified",
            "@content":"9 October 2023"
          },
          {
            "@name":"description",
            "@content":"Torus example demonstrating cross-section prototype for Extrusion node that also draws spine line plus oriented, scaled cross sections at each spine point."
          },
          {
            "@name":"hint",
            "@content":"Utilize ExtrusionCrossSection ProtoInstance as a Shape node (with containerField=\"children\") rather than an Extrusion node (with containerField=\"geometry\")."
          },
          {
            "@name":"reference",
            "@content":"ExtrusionExampleShip.x3d"
          },
          {
            "@name":"reference",
            "@content":"ExtrusionCrossSectionExampleShip.x3d"
          },
          {
            "@name":"reference",
            "@content":"ExtrusionCrossSectionPrototype.x3d"
          },
          {
            "@name":"reference",
            "@content":"https://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Chapter30-Scripts/Figure30.5ScriptTorusBuilder.x3d"
          },
          {
            "@name":"reference",
            "@content":"VRML 97 Specification, 6.18 Extrusion"
          },
          {
            "@name":"reference",
            "@content":"https://www.web3d.org/technicalinfo/specifications/vrml97/part1/nodesRef.html#Extrusion"
          },
          {
            "@name":"Image",
            "@content":"VRML 97 Specification, Figure 6.6"
          },
          {
            "@name":"Image",
            "@content":"https://www.web3d.org/technicalinfo/specifications/vrml97/Images/Extrusion.gif"
          },
          {
            "@name":"reference",
            "@content":"http://realism.com/Web3D/Examples/Extrusion/_frame.html"
          },
          {
            "@name":"reference",
            "@content":"http://www.cs.brown.edu/~gss/vrml/drawpoly.html"
          },
          {
            "@name":"reference",
            "@content":"ExtrusionXj3dGoldberg1999.java"
          },
          {
            "@name":"reference",
            "@content":"http://web3d.metrolink.com/cgi-bin/cvsweb.cgi/x3d/src/com/sun/j3d/loaders/vrml97/impl/Attic/Extrusion.java"
          },
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            "@name":"identifier",
            "@content":"https://www.web3d.org/x3d/content/examples/Basic/course/ExtrusionCrossSectionExampleTorus.x3d"
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          },
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            "@name":"license",
            "@content":"../license.html"
          },
          {
            "@name":"translated",
            "@content":"20 April 2026"
          },
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        ]
    },
    "Scene": {
        "-children":[
          {
            "#comment":"Utilize ExtrusionCrossSection ProtoInstance as a Shape node (with containerField=\"children\") rather than an Extrusion node (with containerField=\"geometry\")."
          },
          { "WorldInfo":
            {
              "@title":"ExtrusionCrossSectionExampleTorus.x3d"
            }
          },
          { "ExternProtoDeclare":
            {
              "@name":"ExtrusionCrossSection",
              "@appinfo":"Shape prototype for Extrusion node that also draws spine line plus oriented scaled cross sections at each spine point",
              "@documentation":"https://www.web3d.org/x3d/content/examples/Basic/course/ExtrusionCrossSectionPrototype.x3d",
              "@url":["ExtrusionCrossSectionPrototype.x3d#ExtrusionCrossSection","https://www.web3d.org/x3d/content/examples/Basic/course/ExtrusionCrossSectionPrototype.x3d#ExtrusionCrossSection","ExtrusionCrossSectionPrototype.wrl#ExtrusionCrossSection","https://www.web3d.org/x3d/content/examples/Basic/course/ExtrusionCrossSectionPrototype.wrl#ExtrusionCrossSection"],
              "-children":[
                {
                  "#comment":"run-time eventIn Extrusion-modification interfaces for VRML 97 compatibility"
                }
              ],
              "field": [
                {
                  "@name":"name",
                  "@accessType":"initializeOnly",
                  "@appinfo":"Extrusion name",
                  "@type":"SFString"
                },
                {
                  "@name":"crossSection",
                  "@accessType":"initializeOnly",
                  "@appinfo":"Extrusion field",
                  "@type":"MFVec2f"
                },
                {
                  "@name":"spine",
                  "@accessType":"initializeOnly",
                  "@appinfo":"Extrusion field",
                  "@type":"MFVec3f"
                },
                {
                  "@name":"scale",
                  "@accessType":"initializeOnly",
                  "@appinfo":"Extrusion field",
                  "@type":"MFVec2f"
                },
                {
                  "@name":"orientation",
                  "@accessType":"initializeOnly",
                  "@appinfo":"Extrusion field",
                  "@type":"MFRotation"
                },
                {
                  "@name":"beginCap",
                  "@accessType":"initializeOnly",
                  "@appinfo":"Extrusion field",
                  "@type":"SFBool"
                },
                {
                  "@name":"endCap",
                  "@accessType":"initializeOnly",
                  "@appinfo":"Extrusion field",
                  "@type":"SFBool"
                },
                {
                  "@name":"ccw",
                  "@accessType":"initializeOnly",
                  "@appinfo":"Extrusion field",
                  "@type":"SFBool"
                },
                {
                  "@name":"convex",
                  "@accessType":"initializeOnly",
                  "@appinfo":"Extrusion field",
                  "@type":"SFBool"
                },
                {
                  "@name":"creaseAngle",
                  "@accessType":"initializeOnly",
                  "@appinfo":"Extrusion field",
                  "@type":"SFFloat"
                },
                {
                  "@name":"solid",
                  "@accessType":"initializeOnly",
                  "@appinfo":"Extrusion field",
                  "@type":"SFBool"
                },
                {
                  "@name":"spineColor",
                  "@accessType":"inputOutput",
                  "@appinfo":"emissiveColor of spine",
                  "@type":"SFColor"
                },
                {
                  "@name":"crossSectionColor",
                  "@accessType":"inputOutput",
                  "@appinfo":"diffuseColor of crossSection",
                  "@type":"SFColor"
                },
                {
                  "@name":"crossSectionTransparency",
                  "@accessType":"inputOutput",
                  "@appinfo":"transparency of crossSection",
                  "@type":"SFFloat"
                },
                {
                  "@name":"extrusionColor",
                  "@accessType":"inputOutput",
                  "@appinfo":"diffuseColor of extrusion hull",
                  "@type":"SFColor"
                },
                {
                  "@name":"extrusionTransparency",
                  "@accessType":"inputOutput",
                  "@appinfo":"transparency of extrusion hull",
                  "@type":"SFFloat"
                },
                {
                  "@name":"extrusionImageTexture",
                  "@accessType":"initializeOnly",
                  "@appinfo":"Image to apply to Extrusion",
                  "@type":"SFNode"
                },
                {
                  "@name":"extrusionTextureTransform",
                  "@accessType":"initializeOnly",
                  "@appinfo":"TextureTransform coordinates of image applied to Extrusion",
                  "@type":"SFNode"
                },
                {
                  "@name":"set_crossSection",
                  "@accessType":"inputOnly",
                  "@appinfo":"Extrusion field",
                  "@type":"MFVec2f"
                },
                {
                  "@name":"set_spine",
                  "@accessType":"inputOnly",
                  "@appinfo":"Extrusion field",
                  "@type":"MFVec3f"
                },
                {
                  "@name":"set_scale",
                  "@accessType":"inputOnly",
                  "@appinfo":"Extrusion field",
                  "@type":"MFVec2f"
                },
                {
                  "@name":"set_orientation",
                  "@accessType":"inputOnly",
                  "@appinfo":"Extrusion field",
                  "@type":"MFRotation"
                },
                {
                  "@name":"traceEnabled",
                  "@accessType":"initializeOnly",
                  "@appinfo":"Whether to provide initialization trace statements showing node construction",
                  "@type":"SFBool"
                }
              ]
            }
          },
          {
            "#comment":"===================="
          },
          {
            "#comment":"Example instance adapted from Figure15.12Torus.x3d"
          },
          {
            "#comment":"https://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Chapter15-Extrusion/Figure15.12Torus.x3d"
          },
          { "Viewpoint":
            {
              "@description":"Torus crossSections, spine and hull",
              "@orientation":[-0.351,0.926,0.14,0.81],
              "@position":[10,5,10]
            }
          },
          { "ProtoInstance":
            {
              "@name":"ExtrusionCrossSection",
              "fieldValue": [
                {
                  "@name":"name",
                  "@value":"Torus"
                },
                {
                  "@name":"crossSection",
                  "@value":[0,1,0.38,0.92,0.71,0.71,0.92,0.38,1,0,0.92,-0.38,0.71,-0.71,0.38,-0.92,0,-1,-0.38,-0.92,-0.71,-0.71,-0.92,-0.38,-1,0,-0.92,0.38,-0.71,0.71,-0.38,0.92,0,1]
                },
                {
                  "@name":"spine",
                  "@value":[2.00,0.0,0.00,1.85,0.0,0.77,1.41,0.0,1.41,0.77,0.0,1.85,0.00,0.0,2.00,-0.77,0.0,1.85,-1.41,0.0,1.41,-1.85,0.0,0.77,-2.00,0.0,0.00,-1.85,0.0,-0.77,-1.41,0.0,-1.41,-0.77,0.0,-1.85,0.00,0.0,-2.00,0.77,0.0,-1.85,1.41,0.0,-1.41,1.85,0.0,-0.77,2.00,0.0,0.00]
                },
                {
                  "@name":"beginCap",
                  "@value":false
                },
                {
                  "@name":"endCap",
                  "@value":false
                },
                {
                  "@name":"creaseAngle",
                  "@value":1.57
                },
                {
                  "@name":"spineColor",
                  "@value":[1,1,1]
                },
                {
                  "@name":"crossSectionColor",
                  "@value":[0.8,0.8,0]
                },
                {
                  "@name":"crossSectionTransparency",
                  "@value":0.1
                },
                {
                  "@name":"extrusionColor",
                  "@value":[1,0,1]
                },
                {
                  "@name":"extrusionTransparency",
                  "@value":0.8
                },
                {
                  "@name":"traceEnabled",
                  "@value":false
                }
              ]
            }
          },
          { "Transform":
            {
              "@scale":[4,4,4],
              "-children":[
                { "Inline":
                  {
                    "@DEF":"CoordinateAxes",
                    "@url":["../../X3dForWebAuthors/Chapter03Grouping/CoordinateAxes.x3d","../../Savage/Tools/Authoring/CoordinateAxes.x3d","https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter03Grouping/CoordinateAxes.x3d","../../X3dForWebAuthors/Chapter03Grouping/CoordinateAxes.wrl","../../Savage/Tools/Authoring/CoordinateAxes.wrl","https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter03Grouping/CoordinateAxes.wrl","https://www.web3d.org/x3d/content/examples/Savage/Tools/Authoring/CoordinateAxes.x3d","https://www.web3d.org/x3d/content/examples/Savage/Tools/Authoring/CoordinateAxes.wrl"]
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}