Collision Groups

#1 It has to be:

function t2dSceneObject::onCollision(%srcObj, %dstObj, %srcRef,
   %dstRef, %time, %normal, %contactCount, %contacts)
{
   if( (%srcObj.graphGroup == $playergroup) && (%dstobj.graphGroup == $platformgroup) )
   {
   	collideplayerplatform(%normal);
  }
  
  if( (%srcObj.graphGroup == $playergroup) && (%dstobj.graphGroup == $trapgroup) )
  {
  	playertrap(%normal);
  }
}

A single '=' is the assignment operator. '==' is for comparison. '$=' is for comparison of strings.

#2 And you'd probably be better off doing something like this:

function t2dSceneObject::onCollision(%srcObj, %dstObj, %srcRef, %dstRef, %time, %normal, %contactCount, %contacts)
{
	// collision has occured
	switch (%srcObj.getGraphGroup())
	{
	// player has hit something
	case $playerGroup:
		switch (%dstObj.getGraphGroup())
		{
		// hit the pltform group
		case $platformGroup:
			collideplayerplatform(%normal);

		// hit the trap group
		case $trapGroup:
			playertrap(%normal);
 		}
	}
}

Not sure about any performance benefits, but it's definately easier to read.

#3 Ehh, thats how i initially went after this problem and it wouldn't work for the life of me so I decided on using some If statements for the time being.

What is the difference between using GraphGroup and .class.

%srcObj.graphGroup == $playergroup

vs.

%srcObj.class == $playergroup


both work the same for me

#4

Quote:
both work the same for me

That is pure coincident. I guess your $playergroup is 0.

Class specifies the class/namespace this object belongs to.

#5 Thanks for all the help so far guys, I appreciate it. So far this is what I have. I have two problems.

1) My character can jump while airborn
My solution to this was to set a value to when he is colliding with the ground and to say you can only run the jump function when this value is present but Im not quite sure where to place these values.

2) My other collision functions dont fire and I receive a million echos of 'collision function' no matter what I am colliding with, whether it be a trap or anything. Can you see any reason that these function aren't firing when called upon?

function t2dSceneObject::onCollision(%srcObj, %dstObj, %srcRef,   %dstRef, %time, %normal, %contactCount, %contacts)
{   
	//playergroup = 1
	//platformgroup = 2
	//trapgroup = 3
	//playercheese = 4
	//blockgroup = 5
	if( (%srcObj.graphgroup == $playergroup) && (%dstobj.graphgroup == $platformgroup) )
	  	   
	  	    $ground = 1; //new 	
	  	    
	  	  
	   	if($jump < 1)
	   	{
	   		collideplayerplatform(%normal);  
	   	}
	   	else if(($jump = 1) && ($ground = 1))
	   	{
	   		
	   		playerjump(%normal);
	   	}
	   	     
	else if( (%srcObj.graphgroup == $playergroup) && (%dstobj.graphgroup == $trapgroup) )
	  {  
	  		playertrap(%normal); 
	  		 }
	 else if( (%srcObj.graphgroup == $playergroup) && (%dstobj.graphgroup == $playercheese) )
	 {
	 	echo("cheesicle");
	}
	  		 }

These are the functions that I am trying to pass to in certain instances. None are complete yet, I am just trying to get it down where they are all being used at the correct times.

function collideplayerplatform(%normal)
{
	echo("colision function");
	%move = $moveright - $moveleft;
	$myplayer.setlinearvelocityX(%move * $myplayer.runspeed);
}

function playertrap(%normal)
{
	echo("player trap");
	//$myplayer.setlinearvelocity(-10, -10);
	//$myplayer.setconstantforce( 10, 10);
	$myplayer.safedelete();
	}
	

function playerjump(%normal)
{
	
	$myplayer.setlinearvelocityY(-10 * $myplayer.jumpheight);
	$myplayer.setConstantForce( 0, 140 );
	$ground = 0; 
}

I realize the $ground = 0; line in playerjump is pretty useless in telling the computer the character is off the ground since it gets set to 1 again before the next jump anyways but where would you suggest putting this or what would you suggest in order to make it so my character can oonly jump when in contact with the platform?