[JAVA3D] How to control "frame rate" to 30fps

[Woody F. Lee]

A flow contol question.
In my application,I use the View method like this:

view.setMinimumFrameCycleTime(33);   /* (int)(1000/33) =30

and I set "WakeupOnElapsedFrames(1)" in a Behavior and
calls showFPS() method showed here:

private int showFPS()
  {
    long lastD=view.getLastFrameDuration();
    if (lastD==0)
      return 0;
    System.out.println("FPS:"+(float)1000.0/lastD);
    return 1;
  }

but the result shows the FPS can often reach 62.5 or more

Why it is like this?and how I can control frame to exact rate.

Thanks a lot.
                                              Woody

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