[JAVA3D] 3D example "strange bug"

[Anonymous]

Hi:   I just downloaded 3d Java and tested on my Windows NT pc.  Strangely enough, some samples run OK but some do not.  For example the first sample I test is "Appearance", I get following error message "java AppearanceTest java.lang.NoClassDefFoundError: javax/media/j3d/Bounds Exception in thread "main""   I further tested the program and I get even more frustrated.  The program I modified as follows:   // source code I modified from AppearanceTest import java.applet.Applet; import java.awt.*; import java.awt.event.*; import com.sun.j3d.utils.applet.MainFrame; import com.sun.j3d.utils.universe.*; import com.sun.j3d.utils.image.TextureLoader; import javax.media.j3d.*; import javax.vecmath.*;   public class MyAppearance extends Frame//Applet {     public static void main(String args[])  {   // new MainFrame(new AppearanceTest(), 700, 700);     System.out.println("Hello world");  }    private Appearance createAppearance(int idx)  {   Appearance app = new Appearance();     // Globally used colors   Color3f black = new Color3f(0.0f, 0.0f, 0.0f);   Color3f white = new Color3f(1.0f, 1.0f, 1.0f);     // Color3f objColor = new Color3f(1.0f, 0.2f, 0.4f);     switch (idx)   {    // Unlit solid     case 0:      {    // Set up the coloring properties      //????????????????????????????????????????????    // error seem appear here     // when I move the following statement above the switch statement as commented there or when ca.setColor(new Color3f(1.0f, 0.2f, 0.4f)); the error message disappear.    Color3f objColor = new Color3f(1.0f, 0.2f, 0.4f);    // ????????????????????????????????????????????      ColoringAttributes ca = new ColoringAttributes();    // ca.setColor(new Color3f(1.0f, 0.2f, 0.4f));    ca.setColor(objColor);    app.setColoringAttributes(ca);       break;      }     default:   {    ColoringAttributes ca = new ColoringAttributes();    ca.setColor(new Color3f(0.0f, 1.0f, 0.0f));    app.setColoringAttributes(ca);   }////////   }     return app;    }   }   // error msg when I execute the program /*cd d:/JavaBook/java3d/Appearance/ java MyAppearance java.lang.NoClassDefFoundError: javax/vecmath/Color3f Exception in thread "main" Compilation exited abnormally with code 1 at Wed Jun 23 15:04:05 */ Any setting wrong with JDK or Java3D? Thanks a lot.   Taoan Ge CS student University of Iowa