Java3D失踪行为

Question

在我看来，Java3D有时在Frame/JPanel/Canvas3D调整大小时重画场景。我在使用Java3D/JUNG3D的应用程序中遇到问题，如果Frame/JPanel/Canvas3D的水平尺寸具有一定的大小，整个场景就会消失。我试图简单地解决这个问题，然后发现在下面的示例代码中会出现类似的问题：http://www.java3d.org/samples.html（倒数第二个例子，“Text 3D Example”）为了方便，我将粘贴到底部。

步骤：

1. 使用3个Java3D的罐安装Java3D的
2. 构建这个例子。
3. 运行
4. 水平拉伸框架到500像素左右，然后一切消失。收缩它然后再次在那里。当事情消失时，垂直拉伸，事情再次出现。

它似乎与Frame/JPanel/Canvas3D纵横比和它显示的内容有关。我猜测我自己的问题略有不同，因为我显示的是不同纵横比的场景，底层问题是相同的。任何人都可以告诉我如何能够解决这个bug /功能，以便在窗口大小调整时场景不会消失？

这里是我到目前为止已经试过，但没有成功：

1. 凤云的JPanel调整事件，然后迫使Canvas3D重绘
2. 双缓冲设置播放
3. 许多其他的事情，我可以“T记得现在 - 刚回来，从休假:)

代码：

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import javax.media.j3d.*; 
import javax.vecmath.*; 
import com.sun.j3d.utils.universe.*; 
import com.sun.j3d.utils.geometry.*; 

public class Titles { 

    public static void main(String[] args) { 
     Titles t = new Titles(); 
     t.setUp(); 
    } 

    public void setUp() { 
     JFrame jf = new JFrame("Welcome"); 
     // kill the window on close 
     jf.addWindowListener(new WindowAdapter() { 
      public void windowClosing(WindowEvent winEvent) { 
       System.exit(0); 
      } 
     }); 
     JPanel panel = new JPanel(); 
     panel.setLayout(new GridLayout(1, 1, 2, 2)); 

     GraphicsConfiguration config = SimpleUniverse 
       .getPreferredConfiguration(); 
     Canvas3D canvas3D = new Canvas3D(config); 
     canvas3D.setSize(360, 160); 
     SimpleUniverse universe = new SimpleUniverse(canvas3D); 
     BranchGroup group = new BranchGroup(); 
     addObjects(group); 
     addLights(group); 
     universe.getViewingPlatform().setNominalViewingTransform(); 
     universe.addBranchGraph(group); 
     panel.add(canvas3D); 
     jf.getContentPane().add(panel, BorderLayout.CENTER); 
     jf.pack(); 
     jf.setVisible(true); 
    } 

    public void addLights(BranchGroup group) { 
     BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 
       1000.0); 

     Color3f light1Color = new Color3f(1.0f, 1.0f, 1.0f); 
     Vector3f light1Direction = new Vector3f(4.0f, -7.0f, -12.0f); 
     DirectionalLight light1 = new DirectionalLight(light1Color, 
       light1Direction); 
     light1.setInfluencingBounds(bounds); 
     group.addChild(light1); 

     // Set up the ambient light 
     Color3f ambientColor = new Color3f(.1f, .1f, .1f); 
     AmbientLight ambientLightNode = new AmbientLight(ambientColor); 
     ambientLightNode.setInfluencingBounds(bounds); 
     group.addChild(ambientLightNode); 
    } 

    private void addObjects(BranchGroup group) { 
     Font3D f3d = new Font3D(new Font("TestFont", Font.PLAIN, 2), 
       new FontExtrusion()); 
     Text3D text = new Text3D(f3d, new String("Java3D.org"), new Point3f(-3.5f, 
       -.5f, -4.5f)); 

     text.setString("Java3D.org"); 
     Color3f white = new Color3f(1.0f, 1.0f, 1.0f); 
     Color3f blue = new Color3f(.2f, 0.2f, 0.6f); 
     Appearance a = new Appearance(); 
     Material m = new Material(blue, blue, blue, white, 80.0f); 
     m.setLightingEnable(true); 
     a.setMaterial(m); 

     Shape3D sh = new Shape3D(); 
     sh.setGeometry(text); 
     sh.setAppearance(a); 
     TransformGroup tg = new TransformGroup(); 
     Transform3D t3d = new Transform3D(); 
     Transform3D tDown = new Transform3D(); 
     Transform3D rot = new Transform3D(); 
     Vector3f v3f = new Vector3f(-1.6f, -1.35f, -6.5f); 
     t3d.setTranslation(v3f); 
     rot.rotX(Math.PI/5); 
     t3d.mul(rot); 
     v3f = new Vector3f(0, -1.4f, 0f); 
     tDown.setTranslation(v3f); 
     t3d.mul(tDown); 
     tg.setTransform(t3d); 
     tg.addChild(sh); 
     group.addChild(tg); 

    } 
} 

Answer 1

尝试在此处设置缓冲区，教程。 http://www.youtube.com/watch?v=vzfnUSLKUDs&list=ECA331A6709F40B79D