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‫Hey.

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‫Welcome back.

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‫We're exposing variables to blueprints.

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‫And now we'd like to talk about exposing our components.

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‫This will allow us to set some of the properties, such as the meshes on our static mesh components,

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‫as well as positioning our capsule and projectile spawn point.

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‫Now we're back here in VS Code and we have all of our test variables.

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‫And before we start going and exposing our private component variables, there's just a couple more

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‫you property specific things we need to learn about.

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‫For one, all of our test variables are in the public section and a couple of our variables here are

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‫exposed to the event graph allowing read access and right access, and these are not allowed in the

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‫private section.

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‫For example, if I take our visible anywhere int and edit anywhere int and cut these and paste them

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‫down here in the private section along with our components.

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‫Here's what happens when we attempt to compile here.

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‫We see in our terminal a couple of errors.

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‫We see blueprint, read, write should not be used on private members and it says the same thing about

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‫Blueprint Read only.

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‫So what if we want read and write access in the event graph on private members?

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‫Well, there's a way to get around this.

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‫We can still have access to private variables in the event graph.

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‫We have to add another input to the U.

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‫Property macro and that input looks like this.

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‫We say meta equals parentheses allow private access equals and in quotes true.

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‫Now this looks pretty weird.

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‫It's sort of a nightmare of syntax, but this is what it looks like.

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‫You property macros allow for metadata and metadata is just a fancy word for data that gives information

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‫about other data.

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‫So we have this meta equals and if we use allow private access equals true, then we can expose these

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‫variables to the event graph even though they're private.

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‫Now, if you're a stickler and you don't think giving private access to a variable is a very good idea,

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‫well, you don't have to do this.

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‫This is just another tool in your toolbox that allows us to expose private variables to blueprint.

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‫And on the C++ side, these are still private.

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‫You still can't access these from other classes.

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‫So you have that encapsulation on the C++ side.

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‫This just gives you the ability to get these in blueprints and make changes to them.

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‫And really in blueprints, it's kind of a different world.

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‫Typically, you're not going to expose things to blueprints that someone could go in and change and

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‫potentially break the game.

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‫But it's useful to know how to do this.

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‫So we're going to give this meta allow private access to both visible anywhere, int and edit anywhere.

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‫And so let's compile this.

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‫And now we see we have a successful compile even though we have blueprint rewrites and blueprint read

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‫only on variables in a private section.

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‫Now back here in BP Pond Tank in the event graph, I can right click and type edit anywhere and here

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‫we see get edit anywhere int we still have access to it and if I search for visible, I see visible

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‫anywhere int we can get and set it.

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‫Now the last thing I'm going to show you that we can add to you properties is a category notice here

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‫in the details panel.

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‫These variables we've added are under this category based upon this is the name of the class and that's

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‫where they go by default.

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‫But notice that we also have other variables inherited by this class and they're each in their own categories.

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‫Now we can create our own category for these exposed variables, and we do that by adding category equals.

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‫And in quotes we can give this a category.

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‫So I could call this super duper variables.

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‫Now I'm going to have a comma here because I placed this here in the U.

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‫Property macro as one of the inputs, and all of the inputs have to be separated by commas.

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‫I'm going to copy this and add it to the U property here for edit anywhere int as well.

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‫So now these should be in their own category called super duper variables.

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‫Let's compile and back here in the editor, check this out.

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‫We have super duper variables and our variables are here and I can right click in the event graph search

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‫for super and check it out.

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‫We have super duper variables and our variables are here.

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‫So this is a nice way to organize our variables and make them a little bit easier to find.

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‫So I've added a couple new things to our table here.

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‫We can give private access, we can take private variables and still expose them to the event graph

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‫with this meta specifiers.

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‫And we can also give variables their own category to organize them in blueprints.

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‫So now that you know plenty of ways to control the access to our variables in Blueprint, you're going

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‫to fill out the you property for the components now decide.

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‫Their access levels.

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‫You're going to want visible anywhere for these because edit anywhere is not something you want to give

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‫to your components.

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‫This means you can actually edit that pointer variable and we don't want to change the pointer.

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‫It should always point to the object.

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‫We construct it in the constructor, but you can also decide whether or not to give them read, write

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‫access in the event graph, give them a category.

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‫This will allow us to keep our variables organized.

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‫Now, if you're going to give them blueprint, read, write, or blueprint read only.

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‫You'll need to allow private access with that meta specified to because these are private variables.

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‫Now, once you've exposed the components to blueprints, then you can set some properties in the default

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‫blueprint.

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‫You can give the static mesh components their own static meshes.

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‫So set that up in both the -- tank and in the turret blueprint and position the capsule.

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‫So it's roughly encompassing the volume of the meshes and position the projectile spawn point, place

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‫it at a point that would make sense for projectiles to spawn from.

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‫So pause the video and expose our components to blueprint.

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‫Okay.

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‫So here we are in our private section, and we'd like to expose these components.

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‫Now, first, I'm going to give my capsule component visible anywhere, and I'm going to just decide

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‫to give this blueprint read only so I can access the capsule comp variable in the event graph, but

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‫I cannot set it.

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‫Now I'm going to give these the category and for our components here, I'm just going to give it the

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‫category components now because I'm using blueprint read only, I'm going to use meta allow private

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‫access equals true.

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‫So I'm going to put that right there.

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‫And for the rest of my components, I'm happy with these same you properties specifiers, so I'm going

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‫to give them all the same specifiers.

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‫Now I'm going to compile this and back here in the editor, I'm going to click on the viewport so I

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‫can actually see what I'm doing here and I can select base mesh.

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‫And for the static mesh property, since we're in the -- tank blueprint, I'm going to choose tank

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‫base.

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‫That's the base of the tank.

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‫Now I can select the turret mesh and for its static mesh I'm going to select tank turret.

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‫And now our tank blueprint actually looks like a tank.

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‫Now before I set the projectile spawn point, I'd like to adjust the capsule component.

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‫So it's roughly encompassing the volume of the mesh.

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‫Now with the capsule component selected, we have these properties capsule half height and capsule radius.

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‫I'm going to scale the radius and the capsule half height just so that this is looking like approximately

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‫the correct shape.

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‫And I'm going to need to position my tank so that it's down at the bottom because our capsule component

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‫is the root component.

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‫We have to move all other components relative to the root so I can select the base mesh and move it

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‫down.

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‫And to get it just right, I can angle my view like this, or I can come up here where it says perspective

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‫and select, right?

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‫And I'm now in orthographic mode.

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‫This place is everything on a plane so I can move things and get them.

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‫Just right now I'm going to turn off snapping so I can position this more precisely, and I think that's

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‫looking pretty good.

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‫Now I'm going to go back into perspective mode so I can see this and make sure everything looks good

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‫and I'll select my capsule component and make sure the scale is just right.

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‫Now, this may take a little bit of adjusting to get right, but with a few tweaks you can get it looking

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‫pretty good.

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‫So I'm satisfied with this.

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‫Next, I'd like to position the projectile spawn point.

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‫I'm going to turn snapping back on and move it up just in front of the barrel here.

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‫So this is looking pretty good.

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‫Now I'm going to go ahead and save this and now it's time to set BP pond turret.

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‫So here in BP pond turret, I'm going to set the base mesh.

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‫So let's select the tower base and I'm going to set turret mesh to tower turret.

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‫There we go.

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‫Now I'm going to scale up the capsule comp and move the base mesh down and just tweak this until I get

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‫it just right.

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‫And again, I can go into orthographic view and turn off snapping and get this positioned approximately

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‫the way I'd like it and go back into perspective.

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‫I think that looks pretty good.

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‫Now, the last thing is the projectile spawn point.

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‫I'm going to turn snapping back on and position it right here in front of the barrel and I'll set the

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‫snapping increments to five just so I can position it right in the front there.

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‫Now make sure that the projectile spawn point is not too close to the barrel.

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‫We're going to be spawning projectiles from this point.

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‫And something that's tripped up some students is that their spawn point is too close to the barrel and

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‫there's a collision there which can result in complications when spawning projectiles.

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‫Now this can be easily solved by making sure the spawn point is a good distance away from the barrel.

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‫And we'll polish this up at the very end of this section of the course.

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‫Okay, so the last thing I'm going to do is place a few of these in the world.

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‫I've already got a BP pond tank here.

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‫I'm going to set that down on the ground.

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‫And let's drag in a couple instances of BP pond turret.

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‫I'm going to place one here and rotate it so it's facing outward and then I'll go ahead and just place

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‫one at each corner here.

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‫So that they can guard this central structure.

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‫And this is looking a little bit more like the finished product.

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‫There we go.

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‫And of course, if I wanted to, I could view this from the top and in top orthographic mode.

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‫I can position these more precisely.

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‫But of course, this is a little bit less important in a polished game.

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‫You're going to want everything to look just right.

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‫Okay, back to perspective mode.

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‫This is looking pretty awesome.

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‫So referring back to our section plan, we've created our tank and our goal is for it to move throughout

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‫the world.

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‫So in the lectures to come, we're going to start learning how to do that.

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‫So in this lecture we have exposed our components to blueprints and we've set some properties in the

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‫blueprints for the tank and for the turret.

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‫Excellent progress.

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‫I'll see you in the next video.