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‫Hello and welcome.

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‫In this lecture, we're going to be seeing how we can add a tag to our gargoyle actor that makes it

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‫be the only actor acceptable to our secret door.

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‫Let's dive in and see how this actor tagging system works.

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‫Now.

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‫We don't want our trigger to be responding to every single case where we get an overlap.

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‫No, we want it to be responding very specifically only to one actor, the gargoyle.

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‫So how do we go about configuring this trigger so that the gargoyle is the only thing it responds to?

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‫Well, fortunately, there is a mechanism for tagging certain actors with certain strings to say that

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‫it has a specific property.

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‫So if you go and select the Gargoyle actor and scroll down in the details pane, you're going to find

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‫and in fact, you can probably just search for it.

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‫You can search for tags.

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‫In particular, we're looking not for component tags, but actor tags.

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‫You can see that there is an array element.

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‫Now we understand what arrays are.

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‫So you can have multiple tags.

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‫It's an array of strings.

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‫So the first thing in this array is you can add it with the add button.

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‫You can delete elements from it with the delete button, and then you can add in a string.

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‫So for example, we might want to put in a string that says it's going to unlock door one.

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‫So we'll put in a string that says unlock one, for example.

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‫And then what we want to do is check whether that string matches unlock one over in our trigger component

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‫CP.

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‫So what we can do here is we can query the actor when we're going over the overlapping actors in our

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‫for loop and we can check whether it has a particular actor tag.

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‫It's very easy to do.

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‫There is a function for it.

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‫So we do.

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‫Actor, Arrow, actor has tag and then you just have to pass in the name, the f name of the tag, which

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‫you can actually just use a string to put this in.

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‫So what we can do is we can put in unlock one like so and we can put a semicolon at the end of the line

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‫and we can wrap this in an if statement.

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‫So saying if the actor has tag unlock one, then let's print out a log message which is going to basically

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‫be that log message saying that we're overlapping, we can say actually unlocking instead so that it's

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‫clear that there's a difference.

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‫And otherwise, if it doesn't find anything to unlock it, it's not going to print anything out.

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‫And let's remove the use of actor name so that all the log message says is that we are unlocking now

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‫let's recompile.

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‫And once that's done, let's open up our output log and dock it to the layout so that we can see the

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‫results.

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‫Let's go and start near our gargoyle.

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‫Hit play, pick up the gargoyle, take it to the alcove.

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‫I just want to show you that if I step in, there is no log message.

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‫There's a log message coming from the beep player.

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‫We could remove that log, but there's nothing coming from our trigger.

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‫Now let's take the gargoyle and stick it in the alcove.

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‫And they go it can see that it is unlocking because of the tag that we have applied.

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‫So let's challenge you to make the tag that we've got there configurable at the moment.

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‫We've just hardcoded it into our code.

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‫So you're going to create a new editable you property.

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‫That type should be an F name so that it matches what the actor tag is expecting.

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‫And you're going to replace your fixed string with this in the code and configure it in the level instead,

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‫which is the right place so that we can reuse this trigger in multiple places.

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‫Pause a video and have a go.

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‫Okay.

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‫Welcome back.

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‫So we're going to go over to the header file for our trigger components.

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‫We're going to go in to the bottom and create a new private section and put a new property edit anywhere.

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‫And it's going to be a type F name, not a pointer to an F name and actual F name, which we're going

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‫to call the I didn't tell you what to call it, but hopefully you try to think up a good name.

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‫I'm going to call this the acceptable actor tag, give it no default at the moment and go over into

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‫our trigger component, CBP.

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‫And instead of using unlocking in here as the actor tag we're checking for, we're going to check for

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‫the acceptable actor tag.

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‫I'm going to go ahead and compile this.

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‫Then I'm going to go and find our secret door.

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‫I'm going to go and find the trigger components.

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‫And you can see that I'm still got the search for TAG.

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‫So acceptable act tag shows up straightaway and we're going to put unlock one to make sure it matches

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‫the gargoyle.

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‫Exactly.

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‫The string has to match perfectly and that should have exactly the same result.

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‫Do go ahead and test it for yourself, but I'm not going to in the video.

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‫Great stuff.

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‫So now we've seen how we can tag actors with strings to give them certain game play meanings and do

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‫that reasonably configurable and flexibly from within.

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‫The editor.

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‫I'll see you in the next video.