How to make a perspective matrix work

Question

I'm trying to get my head around some 3D graphics, but ran into trouble.
I have a number of points that make up a cube. Very simple.
I use an orthographic projection matrix to display it.
But when I try to apply a perspective projection matrix it looks like anything but a cube. I've tried multiple ways to get it to work but it still doesn't.
You can download the source code here: http://www.bastardindustries.com/temp/example.zip
It is written in ActionScript 3.0. But the code is very basic and straight forward so I don't think it's will be a problem even if you are not familiar with ActionScript.
By commenting an uncommenting the following lines (in 3DGraphics.as) you can switch between the orthographic projection and perspective projection matrix. As you can see when just using the orthographic projection matrix it works fine. But with the perspective it doesn't.
// Ortographic and perspective
// mP = mPers.multiplyMatrix(mOrto);
// Just ortographic
mP = mOrto;
Any help on why my perspective matrix isn't working is appreciated.
The perspective matrix looks like this. In a column major order:
n is the near plane and f the far plane.
mA[0] = n;
mA[5] = n;
mA[10] = n+f;
mA[11] = 1;
mA[14] = -(f*n);
mA[15] = 0;
Thanks!
this thread was writting in another website since it was left unanswered
/ Magnus

Answer 1

you can save object to a file using an ObjectOutputStream
I hope, the code below makes things clear...
     Object anObject = new Object();
     Object aPanel = new Panel();
     Button saveButton = addButton("Save",aPanel);
     private Button addButton(String naam, Panel tPanel)
          Button tButton = new Button(naam);
          tButton.addActionListener(this);
          tPanel.add(tButton);
          return tButton;
     public void actionPerformed(ActionEvent e){
          if (e.getSource().equals(saveButton))
               saveObjectToFile();
     public void saveObjectToFile(){
          try
               FileOutputStream fStream = new FileOutputStream("file.dat");
               ObjectOutputStream oStream = new ObjectOutputStream(fStream);
               oStream.writeObject(anObject);
               oStream.close();
          catch (NotSerializableException e)
               System.out.println(e.getMessage());
          catch (IOException e)
               System.out.println(e.getMessage());
     }I hope this helps you out...
Goodluck
Leon van der Ree