Java Tutorial/J2ME/m3g

Use m3g package

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);
  }
}