OLPCities/Using 3D objects

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You can find "3D objects" at our Inventory. The link is: 3D objects.

You can use one of them or create a new . Remember to put it available for everybody.

A "3D object" is created using 3 sprites.

Image:Tut3-1.jpg

Only that using the image having the sufix "S" ("shadow for collision" or only "shadow") is "hard". And they have different levels of "Z". So, the avatar will go over that with the image having sufix "D" (down) and behind that of the sufix "U" (up).

At this lesson we will add a 3D object (this bonfire) to the Lot of the previous. We will use (take a look) elements of the same Classes of the previous lesson:

The code is similar to that of the previous lesson having only the 3 new sprites of the 3D object.

<html>
<head>
<script language="Javascript" src="http://www.dmu.com/olpc/gamelib_core.js"></script> 
<script language="Javascript" src="http://www.dmu.com/olpc/gamelib_sprites.js"></script>
<script language="Javascript" src="http://www.dmu.com/olpc/gamelib_keyboard.js"></script>
<script language="Javascript">

 function init(){

  Sp_linuxcompatible=true;

  Gl_preloader("floorW05N07.gif"); 
  Gl_preloader("plaquehello.gif"); 
  Gl_preloader("avat1.gif");
  Gl_preloader("fogueiraS.gif"); 
  Gl_preloader("fogueiraU.gif"); 
  Gl_preloader("fogueiraD.gif"); 


   upkey=Kb_trapkey("UP");				 
   downkey=Kb_trapkey("DOWN");			  
   rightkey=Kb_trapkey("RIGHT");	
   leftkey=Kb_trapkey("LEFT");
 
  

  
   av=new Sp_Sprite();	 
   av.setImage("avat1.gif",32,32,4,2);  
   av.setXlimits(5,610);
   av.setYlimits(5,385);	 
   av.moveTo( 300,170);	 
   av.setFrame(3);
   av.setFrameByDirection(90,90,1,180,180,3,270,270,0,0,0,2);
   av.setAnimation(0);
   av.setZ(10);
   av.collides=true;
   av.useHitEvents(true);
   av.setAnimationSpeed(3);
   av.switchOn();

  floor=new Sp_Sprite();			 
  floor.setImage("floorW05N07.gif",614,390,1,1); 
  floor.setXlimits( 0,616);	 
  floor.setYlimits( 0,390);
  floor.setFrame(0);	 
  floor.moveTo(0 , 0 );				 
  floor.setZ(5);  
  floor.switchOn();				 

  pl=new Sp_Sprite();			 
  pl.setImage("plaquehello.gif",179,101,1,1); 
  pl.setXlimits( 0,614);	 
  pl.setYlimits( 0,390);
  pl.setFrame(0);	 
  pl.moveTo(355 , 45 );				 
  pl.setZ(12); 
  pl.makeHard(); 
  pl.switchOn()

   bfU=new Sp_Sprite();	 
   bfU.setImage("fogueiraU.gif",62,27,1,1); 
   bfU.setXlimits( 0,614);	 
   bfU.setYlimits( 0,390);
   bfU.setFrame(0);	 
   bfU.moveTo(180 , 248 );				 
   bfU.setZ(15);  
   bfU.switchOn();		

   bfS=new Sp_Sprite();		 
   bfS.setImage("fogueiraS.gif",62,14,1,1); 
   bfS.setXlimits( 0,614);	 
   bfS.setYlimits( 0,390);
   bfS.setFrame(30);	 
   bfS.moveTo(182 , 263 );				 
   bfS.setZ(0);  
   bfS.makeHard();
   bfS.switchOn();

   bfD=new Sp_Sprite();			 
   bfD.setImage("fogueiraD.gif",56,10,1,1); 
   bfD.setXlimits( 0,614);	 
   bfD.setYlimits( 0,390);
   bfD.setFrame(0);	 
   bfD.moveTo(181 , 275 );				 
   bfD.setZ(6);  
   bfD.switchOn();			
  
  Gl_hook("timestep()"); 
  Gl_start();	
 } 

 function timestep(){
    av.setSpeed(0); 
    av.setAnimationRepeat(0);
   if(rightkey.pressed){
     av.setDir(1,0);
     av.setAnimationRepeat(-1);
     av.setSpeed(2);
   }
   else if(leftkey.pressed){
    av.setDir(-1,0);
    av.setAnimationRepeat(-1);
    av.setSpeed(2);
   }
   else if(downkey.pressed){
    av.setDir(0,1);
    av.setAnimationRepeat(-1);
    av.setSpeed(2);
   }
   else if(upkey.pressed){
    av.setDir(0,-1);
    av.setAnimationRepeat(-1);
    av.setSpeed(2);
   }
 }//timestep

</script>
</head>

<title>TUTCITY  </title>
<body  bgcolor="black"  onload="init()" >
</html>

Look the Lot of the exercice (it's a web page) at our web server: http://www.dmu.com/olpctut/tut3.html


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