require 'java'
 
import 'java.awt.BorderLayout'
import 'java.awt.GraphicsConfiguration'
import 'java.awt.Font'
import 'javax.media.j3d.Canvas3D'
import 'javax.media.j3d.BranchGroup'
import 'javax.media.j3d.Transform3D'
import 'javax.media.j3d.TransformGroup'
import 'javax.media.j3d.Appearance'
import 'javax.media.j3d.Material'
import 'javax.media.j3d.Font3D'
import 'javax.media.j3d.FontExtrusion'
import 'javax.media.j3d.Text3D'
import 'javax.media.j3d.Shape3D'
import 'javax.media.j3d.DirectionalLight'
import 'javax.media.j3d.RotationInterpolator'
import 'javax.media.j3d.Alpha'
import 'javax.media.j3d.BoundingSphere'
import 'javax.swing.JFrame'
import 'javax.vecmath.Vector3f'
import 'javax.vecmath.Color3f'
import 'com.sun.j3d.utils.universe.SimpleUniverse'
 
class HelloFrame < JFrame
    def initialize( title )
        super(title)
        self.setSize(640, 480)
        self.setDefaultCloseOperation( JFrame::EXIT_ON_CLOSE )
        @canvas3D = createCanvas3D()
        @scene = createSceneGraph()
        connect(@canvas3D, @scene)
    end
 
    def createCanvas3D()
        getContentPane().setLayout(BorderLayout.new())
        @config = SimpleUniverse.getPreferredConfiguration()
        @canvas3D = Canvas3D.new(@config)
        getContentPane().add(@canvas3D)
        return @canvas3D
    end
 
    def createSceneGraph()
        @objRoot = BranchGroup.new()
        @mover = moveTextBack()
        @spinner = createSpinner()
        @rotator = RotationInterpolator.new(Alpha.new(-1, 4000), @spinner, Transform3D.new(), 0.0, Math::PI * 2)
        @rotator.setSchedulingBounds( BoundingSphere.new() )
        @spinner.addChild(@rotator)
        @objRoot.addChild(@mover)
        @mover.addChild(@spinner)
        @spinner.addChild( createTextShape())
        setLighting(@mover)
        return @objRoot
    end
 
    def createSpinner()
        @spinner = TransformGroup.new()
        @spinner.setCapability(TransformGroup::ALLOW_TRANSFORM_WRITE)
        return @spinner
    end
 
    def moveTextBack() 
        @transform3D = Transform3D.new()
        @transform3D.setTranslation(Vector3f.new(0.0, 0.0, -10.0))
        return TransformGroup.new(@transform3D)
    end
 
    def createTextShape()
        @textAppear = Appearance.new()
        @textAppear.setMaterial(Material.new())
        @font3D = Font3D.new(Font.new("ＭＳ Ｐゴシック", Font::PLAIN, 1), FontExtrusion.new())
        @textGeom = Text3D.new(@font3D, String.new("Hello, Java 3D World!"))
        @textGeom.setAlignment(Text3D::ALIGN_CENTER)
        @textShape = Shape3D.new()
        @textShape.setGeometry(@textGeom)
        @textShape.setAppearance(@textAppear)
        return @textShape
    end
 
    def setLighting(objMove)
        @light = DirectionalLight.new()
        @light.setInfluencingBounds(BoundingSphere.new())
        @light.setDirection(Vector3f.new(0.0,0.0,-1.0))
        @light.setColor(Color3f.new(1.0, 1.0, 1.0))
        objMove.addChild(@light)
    end
 
    def connect(canvas3D, scene)
        @universe = SimpleUniverse.new(canvas3D)
        @universe.getViewingPlatform().setNominalViewingTransform()
        @universe.addBranchGraph(scene)
    end
end 
 
@frame = HelloFrame.new("Hello, World")
@frame.setVisible(true)

C:¥> jrubyw Hello.rb

+------------------------------------------+
|Hello, World!                    [_][~][X]|
+------------------------------------------+
|Hello, Java 3D World!                     |
|                                          |
|                                          |
|                                          |
|                                          |
|                                          |
|                                          |
|                                          |
|                                          |
|                                          |
+------------------------------------------+