Collision against multiple move clips in an array - advice needed!

programming
1

Hi everyone!

This is my first post to the boards, so be gentle :slight_smile:

I’m writing a small game that involves a projectile move clip checking for collision against multiple target movie clips using an array. The scene is set to 800 x 600 @ 30 fps.

My issue is my fps dropping rapidly if there are multiple projectiles in flight: there are currently anywhere from 250 - 750 target MCs (20 x 20 pixels) and 3 to 6 projectile MCs (10 x 10 pixels) in action at any given time.

The target MCs are all part of class that .push into an array onLoad:


function onLoad()
{
         _root.targetArray.push(this);
         _root.DEBUG_potentialTargets++; // tracking total number of targets
}

And have one function:

function destroyMe()
{
			
	for(var i in _root.terrainArray)
	{
		if(_root.terrainArray* == this)
		{
			_root.terrainArray.splice(i,1);
			_root.DEBUG_potentialTargets--;
		}
	}
	this.removeMovieClip();
}

The projectile MC is checking every frame for a collision with anything in the root.targetArray with:

function onEnterFrame()
{
	
	// CHECK the targetArray for collision
	for(var i in _root.targetArray)
	{
		if(this.hitTest(_root.target*))
		{
			_root.targetArray*.destroyMe();
                        // and tell the target to remove itself
		}
	}
}

I’m very much an amateur coder - is there any way to optimize collision detection against such a large number of potential targets and still keep a decent framerate?