Our world has only two residents:

• doe and
• admin

and they can't see eachother ! :-)

We need to create, using 3ds max two new objects who will be the "real bodies" (oops!) of our residents.

The names defined in 3ds Max are: "red" and : "ye"

Our idea is: doe will see admin and, when admin walks, doe will see his walk! And vice-versa.

We will use messages transmited between the two users sending his positions (transforms) continualy.

This is not a good techinical aproach because will use lots of CPU, but is simple for learning.

In the avatarobj script, in the control method - that is a loop - we will add the code:

on control me

  --NEW
  -- conn  is a flag: ON when we have a connection
  
  if member("username").text = "doe" AND conn = 1  then 
    myworld.model("red").transform = myworld.model("avatar").transform
    whichMsg =  myworld.model("red").transform
    --the transmission of the position
    errCode = gConnect.sendNetMessage("admin", "avatarpos", whichMsg)
    
    if errCode <> 0 then 
      member("cwin").text = "Error sending message: " & gConnect.getNetErrorString(errCode) 
     
    end if
    
  end if

  --the same for admin 
  if member("username").text = "admin" AND conn = 1     then 
    myworld.model("ye").transform = myworld.model("avatar").transform
    whichMsg =  myworld.model("ye").transform
    
    errCode = gConnect.sendNetMessage("doe", "avatarpos", whichMsg)
    
    if errCode <> 0 then 
      member("cwin").text = "Error sending message: " & gConnect.getNetErrorString(errCode) 
    end if
   
  end if 
  
  -- old code ------------------------
  if keypressed(126) then   
    acc = 2
  else
    acc = 0
  end if 

  etc. etc.

To receive the new position of the other avatar and make the adjustments we have new code in the setupscript

on DefaultMessageHandler
  
  newMessage = gConnect.getNetMessage()
  errCode = newMessage.errorCode
  if errCode <> 0 then 
    member("cwin").text = "Error: "& errCode & " : " & gConnect.getNetErrorString(errCode)  
  else
   -- connection message
  if newMessage.senderID = "System" AND newMessage.subject = "ConnectToNetServer" then
    member("cwin").text = newMessage.subject & " : " & "Connection Successful" 
    avatarobj.conn = 1
  else
   -- chat message
  if newMessage.subject = "chat" then
   member("cwin").text =  string(newMessage.senderID & ": "&  newMessage.content)
  else
  --NEW
  -- position of the other avatar
   if newMessage.subject = "avatarpos" then
      avatarobj.svect=   newMessage.content 
       if member("username").text = "doe" then
         myworld.model("ye").transform = avatarobj.svect 
       end if
       if member("username").text = "admin" then
         myworld.model("red").transform = avatarobj.svect 
       end if 
    else
    --receiving avatar transform after save/load
      member("cwin").text = string(newMessage.content[1][1])    
      avatarobj.svect=   newMessage.content[1][1]  
      if(avatarobj.load=1) then
        myworld.model("avatar").transform = avatarobj.svect  
        avatarobj.load=0
       end if    
     end if
    end if
   end if
  end if
end

This a simple exercive about avatares and multiusers worlds. If you will try to build a "real" game you will have many challenges. A "real" multiuser game can cost some millons of dolares... and many time... and many designers and programmers... Good luck :-)

You can download our exercice in .DIR format:

Try the demo, using your server prepared like we have seen in previous lessons. Open two web pages using the URL of this page. Connect the two users. Walk with one and look in the other movie. When you have the "focus" the avatar will move. There are a delay of 1/2 - 1 minut to the other avatar begins to walk. Try and wait. If your CPU doesn't crash before all will be funny :-(

The chat and the "load" after a save are not working well. Fix this bugs is a "homework" for you :-)

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