X3D - Einführung - techfak.uni-bielefeld.de · X3D: Extensible 3D Graphics for Web Authors by Don...
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X3D- Einführung -
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Überblick Der X3D Standard
Überblick der Technologien Profile X3D Grundgerüst
Objekte Formen Materialien
Räumliche und logische Organisation Gruppen Koordinatensystem und Transformationen Wiederverwendung mit DEF/USE
Animation und Interaktion Sensoren Routen Animation mit Interpolatoren und Timern
Scripting Wiederverwendung mit Prototypen JavaScript
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Der X3D Standard
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Literatur X3D: Extensible 3D Graphics for
Web Authors by Don Brutzman and Leonard Daly, Morgan Kaufmann Publishers, April 2007, 468 pages.http://x3dGraphics.com
X3D: Programmierung interaktiver 3D-Anwendungen für das Internetvon Jörg H. Kloss, Addison-Wesley Verlag, 2010
stehen im Labor auf M4 und in der Uni Bibliothek
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X3D Profile
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X3D Grundgerüst <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE X3D PUBLIC "ISO//Web3D//DTD X3D
3.0//EN" "http://www.web3d.org/specifications/x3d-3.0.dtd"> <X3D xmlns:xsd='http://www.w3.org/2001/XMLSchema-
instance' profile='Full' version='3.0' xsd:noNamespaceSchemaLocation='http://www.web3d.org/specifications/x3d-3.0.xsd'> <head>
<meta name='title' content='Example.x3d'/> </head> <Scene> </Scene>
</X3D>
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Objekte in X3D
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Formen <Shape> <Box size='1 2 3'/> <Appearance/>
</Shape>
<Shape> <Sphere radius=‘1'/> <Appearance/>
</Shape>
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Felder
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Feldzugriff accessType: input, output, initialize accessType determines if field is data sender, receiver, or holder inputOnly: can only receive events outputOnly: can only send events initializeOnly: cannot send or receive inputOutput: can send, receive and be initialized
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Praxis Shapes Materials
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Räumliche und logische Organisation
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Koordinatensystem
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Transformation <Transform translation=“0 0 0“ rotation=“1 0 0 3.141“ scale=“1 1 1“ >
…
</Transform>
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Gruppen und Transformationen
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Wiederverwendung mit DEF/USE <Transform translation=“0 0 0“> <Shape DEF=“BOX“>
<Box size=“0 0 0“/> <Appearance/>
</Shape> </Transform> <Transform translation=“1 0 0“> <Shape USE=“BOX“/>
</Transform> <Transform translation=“2 0 0“> <Shape USE=“BOX“/>
</Transform>
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Praxis Transformationen Szene im InstantReality zeigen Web-Interface
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Animation und Interaktion
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Sensoren TouchSensor PlaneSensor CylinderSensor KeySensor, StringSensor
G
T
G
TT
S
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Beispiel <Transform DEF='trans_sphere'> <Shape>
<Sphere radius='0.25'/> </Shape>
</Transform> <Transform DEF='trans_plane' translation='0 -0.25 0'> <TouchSensor DEF='ts' /> <Shape>
<Box size='10 0.1 10'/> </Shape>
</Transform> <ROUTE fromNode='ts' fromField='hitPoint_changed'
toNode='trans_sphere' toField='set_translation'/>
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Praxis TouchSensor Beispiel
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Animationen TimeSensor Interpolatoren PositionInterpolator OrientationInterpolator ColorInterpolator …
G
T
TG
PositionInterpolator
TimeSensor
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Praxis Animation
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Scripting
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Prototypes– Wie definiere ich eigene Knoten? Einbinden mit
<ExternProtoDeclare name='MyNode' url='MyNode.x3d' /> Verwenden mit
<MyNode/> Spezifikation in der Datei MyNode.x3d:
<ProtoDeclare name='MyNode'> <ProtoInterface>
<field name='translation' accessType='inputOutput' type='SFVec3f' value='0 0 0'/> </ProtoInterface> <ProtoBody>
<Transform> <IS>
<connect protoField='translation' nodeField=‘translation' /> </IS>
</Transform> </ProtoBody>
</ProtoDeclare>
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Scripting <Script DEF='my_script' mustEvaluate='true'>
<field name='my_time' accessType='inputOnly' type='SFTime' /> <field name='my_target' accessType='inputOnly' type='SFVec3f'/> <field name='my_translation' accessType='outputOnly' type='SFVec3f' /> <![CDATA[javascript:
var target = new SFVec3f(0,0,0); function my_target( value ) { target = value; }; function my_time(value) {
diff = target.subtract( my_translation ); diff = diff.multiply(0.1); my_translation = my_translation.add(diff);
} ]]>
</Script>
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Praxis Scripting: PositionChaser
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Aufgabe
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Sonnensystem Sonne + 4 Planeten Planeten bewegen sich um
die Sonne! Planeten bewegen sich um
die eigene Achse! Texturen gibt es hier: http://planetpixelemporium.
com/planets.html
Weiteres im Wiki unter https://hiro.techfak.uni-
bielefeld.de/twiki/bin/view/Main/InstantRealityEinfuehrung
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