{ "X3D": { "encoding":"UTF-8", "@profile":"Immersive", "@version":"3.2", "@xsd:noNamespaceSchemaLocation":"https://www.web3d.org/specifications/x3d-3.2.xsd", "JSON schema":"https://www.web3d.org/specifications/x3d-4.0-JSONSchema.autogenerated.json", "head": { "-children":[ { "#comment":"meta content='Rename and test these prototypes to match final names in X3D Specification Followers Component' name='TODO'>" }, { "#comment":"meta content='Ensure full coverage of follower nodes in order to provide backwards compatibility with X3D v3.0 and v3.1.' name='TO DO'" }, { "#comment":"meta content='Xj3D Player Bugzilla Issue http://bugzilla.xj3d.org/show_bug.cgi?id=639' name='TODO'" } ], "meta": [ { "@name":"title", "@content":"FollowerPrototypeDeclarations.x3d" }, { "@name":"description", "@content":"Original implementation pattern as prototype declarations for Follower (Chaser and Damper) nodes, useful for browser developers." }, { "@name":"creator", "@content":"Herbert Stocker" }, { "@name":"translator", "@content":"Don Brutzman" }, { "@name":"created", "@content":"18 April 2006" }, { "@name":"translated", "@content":"2 December 2011" }, { "@name":"modified", "@content":"2 January 2025" }, { "@name":"warning", "@content":"This scene was used for X3D development and is no longer correct." }, { "@name":"specificationSection", "@content":"X3D Architecture, clause 39 Followers component" }, { "@name":"specificationUrl", "@content":"https://www.web3d.org/specifications/X3Dv4/ISO-IEC19775-1v4-IS/Part01/components/followers.html" }, { "@name":"reference", "@content":"FollowerExternalPrototypeDeclarations.x3d" }, { "@name":"reference", "@content":"originals/Chasers.wrl" }, { "@name":"reference", "@content":"originals/Dampers.wrl" }, { "@name":"reference", "@content":"Stocker_06_Followers.pdf" }, { "@name":"reference", "@content":"http://www.hersto.com/Publications/Followers" }, { "@name":"requires", "@content":"X3D version 3.0, 3.1" }, { "@name":"subject", "@content":"X3D Follower Chaser Damper" }, { "@name":"reference", "@content":"https://www.web3d.org/x3d/specifications/ISO-IEC-19775-1.2-X3D-AbstractSpecification/Part01/components/followers.html" }, { "@name":"reference", "@content":"https://www.web3d.org/x3d/content/examples/X3dSceneAuthoringHints.html" }, { "@name":"identifier", "@content":"https://www.web3d.org/x3d/content/examples/Basic/Followers/FollowerPrototypeDeclarations.x3d" }, { "@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" }, { "@name":"reference", "@content":"X3D JSON encoding: https://www.web3d.org/wiki/index.php/X3D_JSON_Encoding" } ] }, "Scene": { "-children":[ { "WorldInfo": { "@info":["The ExternProto nodes found in this file implement principles described in the paper","Linear Filters - Animating Objects in a Flexible and Pleasing Way","They have been proposed and added to the X3D standard in 2006.","Webpage: http://www.hersto.net/Followers","Please use the code in this file in any content or application you like","or modify it in any way.","The code here works, however things like detecting when a transition has ended","and when the node can stop calculating and updating the output or secondary fields","like set_value or initial_destination are not yet implemented.","Nevertheless, set_destination and value_changed do work."], "@title":"Damper nodes" } }, { "ProtoDeclare": { "@name":"PositionChaser", "ProtoInterface": { "field": [ { "@name":"value_changed", "@accessType":"outputOnly", "@type":"SFVec3f" }, { "@name":"set_value", "@accessType":"inputOnly", "@type":"SFVec3f" }, { "@name":"credits", "@accessType":"initializeOnly", "@type":"MFString", "@value":["Initial idea and copyright by Herbert Stocker http://www.hersto.net"] }, { "@name":"isActive", "@accessType":"outputOnly", "@type":"SFBool" }, { "@name":"set_destination", "@accessType":"inputOnly", "@type":"SFVec3f" }, { "@name":"duration", "@accessType":"initializeOnly", "@type":"SFTime", "@value":1.0 }, { "@name":"initial_destination", "@accessType":"initializeOnly", "@type":"SFVec3f", "@value":[0.0,0.0,0.0] }, { "@name":"initial_value", "@accessType":"initializeOnly", "@type":"SFVec3f", "@value":[0.0,0.0,0.0] } ] }, "ProtoBody": { "-children":[ { "Script": { "@DEF":"ScreenPositionDamper_PositionChaser", "field": [ { "@name":"Tick", "@accessType":"inputOnly", "@type":"SFTime" }, { "@name":"set_value", "@accessType":"inputOnly", "@type":"SFVec3f" }, { "@name":"duration", "@accessType":"initializeOnly", "@type":"SFTime" }, { "@name":"Buffer", "@accessType":"initializeOnly", "@type":"MFVec3f" }, { "@name":"bInitialized", "@accessType":"initializeOnly", "@type":"SFBool", "@value":false }, { "@name":"BufferEndTime", "@accessType":"initializeOnly", "@type":"SFTime", "@value":0.0 }, { "@name":"cNumSupports", "@accessType":"initializeOnly", "@type":"SFInt32", "@value":10 }, { "@name":"set_destination", "@accessType":"inputOnly", "@type":"SFVec3f" }, { "@name":"value_changed", "@accessType":"outputOnly", "@type":"SFVec3f" }, { "@name":"cStepTime", "@accessType":"initializeOnly", "@type":"SFTime", "@value":0.0 }, { "@name":"previousValue", "@accessType":"initializeOnly", "@type":"SFVec3f", "@value":[0.0,0.0,0.0] }, { "@name":"initial_destination", "@accessType":"initializeOnly", "@type":"SFVec3f" }, { "@name":"destination", "@accessType":"initializeOnly", "@type":"SFVec3f", "@value":[0.0,0.0,0.0] }, { "@name":"isActive", "@accessType":"outputOnly", "@type":"SFBool" }, { "@name":"initial_value", "@accessType":"initializeOnly", "@type":"SFVec3f" } ], "IS": { "connect": [ { "@nodeField":"set_value", "@protoField":"set_value" }, { "@nodeField":"duration", "@protoField":"duration" }, { "@nodeField":"set_destination", "@protoField":"set_destination" }, { "@nodeField":"value_changed", "@protoField":"value_changed" }, { "@nodeField":"initial_destination", "@protoField":"initial_destination" }, { "@nodeField":"isActive", "@protoField":"isActive" }, { "@nodeField":"initial_value", "@protoField":"initial_value" } ] }, "#sourceCode":[ "", "", "ecmascript:", "", "function initialize()", "{", " CheckInit();", "}", "", "function CheckInit()", "{", " if(!bInitialized)", " {", " bInitialized= true; // Init() may call other functions that call CheckInit(). 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