Java Tutorial/J2ME/m3g

Use m3g package

   <source lang="java">

import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.game.GameCanvas; import javax.microedition.m3g.Camera; import javax.microedition.m3g.Graphics3D; import javax.microedition.m3g.Loader; import javax.microedition.m3g.World; import javax.microedition.midlet.MIDlet; public class RMMIDlet extends MIDlet implements CommandListener {

 private Display myDisplay = null;
 private RetainedCanvas myCanvas = null;
 private Command exitCommand = new Command("Exit", Command.ITEM, 1);
 public RMMIDlet() {
   super();
   myDisplay = Display.getDisplay(this);
   myCanvas = new RetainedCanvas();
   myCanvas.setCommandListener(this);
   myCanvas.addCommand(exitCommand);
 }
 public void startApp() {
   myCanvas.init();
   myDisplay.setCurrent(myCanvas);
   myCanvas.start();
 }
 public void pauseApp() {
 }
 public void destroyApp(boolean unconditional) {
   myCanvas.stop();
 }
 public void commandAction(Command cmd, Displayable disp) {
   if (cmd == exitCommand) {
     try {
       destroyApp(false);
       notifyDestroyed();
     } catch (Exception e) {
       e.printStackTrace();
     }
   }
 }

} class RetainedCanvas extends GameCanvas implements Runnable {

 private boolean mRunning = false;
 private Thread mPaintThrd = null;
 private Graphics3D mGraphics3D = Graphics3D.getInstance();
 private World mWorld = null;
 private Camera mCam = null;
 private long mWorldStartTime = 0;
 public RetainedCanvas() {
   super(true);
 }
 public void init() {
   try {
     mWorld = (World) Loader.load("/p.m3g")[0];
     mCam = mWorld.getActiveCamera();
     mCam.translate(0, 0, -1.5f);
     mCam.setOrientation(180, 0, 1, 0);
   } catch (Exception e) {
     e.printStackTrace();
   }
   mWorldStartTime = System.currentTimeMillis();
 }
 public void start() {
   mRunning = true;
   mPaintThrd = new Thread(this);
   mPaintThrd.start();
 }
 public void stop() {
   mRunning = false;
   try {
     mPaintThrd.join();
   } catch (InterruptedException ex) {
   }
 }
 public void run() {
   Graphics g = getGraphics();
   long startTime;
   while (mRunning) {
       cameraForward();
       startTime = System.currentTimeMillis() - mWorldStartTime;
       mWorld.animate((int) startTime);
       mGraphics3D.bindTarget(g);
       mGraphics3D.render(mWorld);
       mGraphics3D.releaseTarget();
       flushGraphics();
       try {
         Thread.sleep(100);
       } catch (InterruptedException ie) {
       }
   }
 }
 private void cameraForward() {
   mCam.translate(0f, 0f, 0.2f);
 }

}</source>