Filtering Objects Passing Through Triggers

Triggers will fire for any object passing through them that have a TriggerActivating attribute. If we want to create Triggers that only react to certain objects, we'll need to write some code to filter objects out. For instance, let's say we have a special object called 'Player' that we want a Trigger to fire for but for nothing else. Here's how we could achieve it:

function Trigger:onEnter(obj)

	-- Reject objects not named Player
	if (obj:getName() ~= "Player") then
		return
	end

	print("We have a Player")

end

Another method of filtering could be to check to see if the object is of a particular type.

function Trigger:onEnter(obj)

	-- Reject if our object is not a Camera
	if (not obj:isTypeOf("Camera")) then
		return
	end
	
	print("We have a Camera")

end

Another check could be to reject objects that don't have RigidBodies:

function Trigger:onEnter(obj)

	-- Reject objects that don't have RigidBodies
	if (not obj:getRigidBody()) then
		return
	end

	print("We have an object with a RigidBody")

end

Checking to see if an object has a particular type of attribute is important so we don't go accessing functions and properties that aren't there which will through an error.