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‫Hello and welcome back.

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‫Now we are moving our tank forward and backward, but we have no way to actually steer the tank.

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‫So in this video, we're going to work on actually turning the tank using something called local rotation.

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‫This is the rotational analog to add actor local offset.

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‫Now add actor local offset had multiple input parameters and we only passed in the first one as the

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‫other three were optional.

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‫But one of those other three had to do with sweeping.

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‫And we're going to discuss a little bit about sweeping before we continue implementing rotation.

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‫So I'm back in the documentation for ADD Actor Local Offset.

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‫So let's take a look at these input parameters once more.

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‫The second one is called B Sweep and it's a Boolean.

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‫Now, if we scroll down a little bit more and read the information here for B sweep, it says Whether

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‫we sweep to the destination location triggering overlaps along the way and stopping short of the target

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‫if blocked by something.

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‫It also goes on to say that only the root component is swept and checked for blocking collision.

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‫Child components move without sweeping.

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‫If collision is off, this has no effect.

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‫So let's talk about what this means now in games programming, sweeping is a technique done by the engine,

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‫as long as sweeping is enabled.

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‫If we have a moving object such as a sphere represented by this circle, each frame as this sphere is

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‫moving, the engine is performing sweep checks.

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‫This means it's checking to see if that move for this particular frame would have resulted in an overlap

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‫between two objects.

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‫So I have this block here represented by this rectangle.

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‫Now let's just consider that these are the only two objects in the world.

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‫So while sweeping is enabled as the sphere is moving towards the object, the engine is checking to

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‫see if these two objects are overlapping.

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‫Now, as the sphere continues to move, let's say during one of these frames the sphere would have moved

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‫such that it's overlapping the other object.

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‫Now what sweeping enabled does is the engine will detect this overlap and move that sphere back for

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‫that particular frame so that it never actually penetrates the object.

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‫Now we never actually see the sphere penetrate the object.

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‫The engine catches that overlap before the movement is actually implemented.

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‫So the result is that we see that the sphere stops just short of overlapping.

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‫So if this rectangle were a wall, for example, the sphere would stop at the surface of the wall.

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‫That is what sweeping achieves for us.

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‫Now the documentation says if collision is off, this has no effect.

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‫So collision has to be enabled in order for sweeping to work.

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‫So back here in tanks CP in the move function, here's our call to add actor local offset and if we

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‫want we can pass in another input parameter here, the second one being the sweep boolean so we can

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‫pass in true here.

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‫So let's compile this and see the effect of enabling sweeping.

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‫Now if we press play and we attempt to move through a wall, for example, we'll see that we move right

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‫through the wall.

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‫So something isn't quite working here.

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‫Now let's look at what that route component for the BP pond tank is.

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‫Recall, we used the capsule component for the route.

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‫So with capsule components selected in BP pond tank.

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‫Let's go to the details panel and scroll down and we'll see here a section called Collision.

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‫And here we see Collision Presets and it has a dropdown.

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‫So let's expand that.

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‫Now, Collision Presets can be set to any number of options and by default we see overlap all dynamic.

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‫Now, depending on the version of Unreal Engine you're using.

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‫You may see something else here, but we can change this.

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‫If we select the dropdown and choose block all dynamic, then the grayed out options below change.

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‫Remember we were on overlap all dynamic and here we see three columns of checkboxes.

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‫These are collision responses and the column to the left show a list of collision object types.

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‫So any given component has its own collision object type.

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‫Notice we can see the object type for the capsule set to world dynamic.

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‫And when we change collision presets to block all dynamic, you'll see that the collision responses

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‫are all checked to block in response to all other collision object types.

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‫So let's press play and see what happens when we try to pass through things.

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‫You'll see that we stop just short of overlapping with.

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‫The other ponds.

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‫Now, if I move the tank so that we can attempt to overlap with the wall and sort of go around the other

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‫ponds.

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‫Now, if I press play, I block the wall as well.

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‫So this collision preset block, all dynamic sets the collision response to block all other object types.

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‫And you can always see the collision object type of a particular component by selecting it in the components

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‫panel and scrolling down to the collision section in the details panel and opening the dropdown for

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‫Collision Presets.

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‫I have the base mesh selected and its object type is world dynamic and it's set to block all.

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‫So now we see that sweeping is working since we set our collision presets for the capsule comp to block

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‫all dynamic.

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‫And we saw in the documentation that only the root component is swept and checked for blocking collision.

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‫So it doesn't really matter what the other components are set to.

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‫We're only checking to see if the root component is blocking something.

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‫Now, one issue that's tripped up some students is that they cannot move as soon as they set the capsule

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‫to block all dynamic.

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‫Now, one reason for this could be that your capsule is overlapping with the floor.

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‫If the capsule is overlapping with the floor, you won't be able to move because the engine will not

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‫allow your tank to move if the capsule component is overlapping with something that it's set to block.

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‫So an easy fix for this would be to make sure your capsule is not overlapping with the floor.

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‫Now, you can go into your BP -- tank and make sure that your capsule is just above the wheels here.

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‫I'm going to go into orthographic view.

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‫And select my base mesh and just bring it down.

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‫So the wheels are just below the capsule component.

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‫So now if your mesh is just on the floor and the capsule is just above the mesh.

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‫You should be able to move around.

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‫So I'm going to hit play and there we go.

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‫So now that we have sweeping out of the way, it's time to start implementing rotation.

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‫Let's go back to our project settings.

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‫So we go to edit project settings, scroll down to input and in the input section we have our axis mappings.

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‫Now we've already taken care of.

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‫Move forward.

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‫It's time to take care of the next one called Turn and Turn has D and A assigned to it where D has a

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‫scale of one and A has a scale of negative one.

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‫We'd like to use the D and AX to rotate the tank.

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‫So in order to bind a function to the turn axis mapping, we need a function to bind.

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‫So we're back in V's code and I'm going to go into the tank file so we can create a function to bind

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‫to that turn axis mapping.

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‫Now I'm just going to call this void function turn and just like move.

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‫It needs a float input parameter and we'll call this value.

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‫So we've declared this function, let's define it and tank CP and I'm going to put it just under the

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‫move function.

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‫So I've given it a function body and I need the class name along with the double colons just before

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‫the function name.

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‫Now we have a proper function.

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‫Now, this isn't the only thing we need to do.

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‫We need to make sure that this function is bound to the axis mapping called turn.

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‫We do that in setup player input component and we do it just like we did the move forward axis mapping.

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‫So we're going to say player input component, we're going to use the arrow operator and bind axis.

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‫Now the first parameter is going to be the axis mapping name wrapped in a text macro.

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‫So we're going to say turn as that was the axis mapping name.

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‫Next is the object we're binding the function for.

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‫We can pass in this and finally we pass in the function we'd like to bind again.

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‫We need the address of operator and it's going to be a tank turn.

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‫So it's as easy as that.

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‫We've bound the turn function to the turn axis mapping.

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‫The only thing left is to actually do something in the turn function.

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‫Now we've seen that we have ADD actor local offset, but there's a rotational analog to this function

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‫and it's called ADD Actor local rotation.

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‫What this does is adds a local rotation to the actor as its name suggests, and you'll see that there

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‫are two different versions of the function, one that takes an F rotator and one that takes something

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‫called an F quad.

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‫We're going to use the version that takes an F rotator.

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‫It's called Delta rotation.

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‫And just like ADD Actor Local offset, it can also take a sweep parameter and the same other two input

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‫parameters as add actor local offset.

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‫And these last three input parameters are optional, just like add actor local offset.

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‫So instead of an F vector, we're going to pass in an F rotator.

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‫Now back here in the turn function, if we create an F rotator and we call this Delta rotation, we'll

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‫see that if we right click on F rotator and go to definition, we're taken to rotator and we'll see

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‫three public member variables here of type float.

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‫Now just like the F vector F rotator has these three components only instead of X, Y and Z, we have

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‫pitch yaw and roll.

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‫Now, yaw is the component that we're interested in.

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‫It says rotation around the up axis in parentheses around Z axis.

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‫And that's the only type of rotation we care about rotating around the Z axis.

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‫That's how we can steer our tank.

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‫Now, I'm just going to point out to you that there are multiple constructors for the F rotator as well,

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‫and that the default again says no initialization, just like with the F vector.

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‫So we can use the one that takes a single float and all components will be initialized to that float

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‫value.

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‫There's one with three float values and you can take a look and see some of the others.

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‫Now, I'll also point out that there's a zero rotator and by the way, this is a static zero rotator.

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‫That's why we can go back into tank CP and say something like equals F rotator zero rotator zero rotator

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‫is a static member variable and you can access static member functions and variables like this by specifying

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‫the class name with the scope resolution operator and referencing that static variable or function by

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‫name.

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‫That's what we're doing here with you.

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‫Gameplay statics get world delta seconds is a static.

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‫Function, meaning we don't need an actual instance of the game gameplay statics class to exist for

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‫us to access that static function.

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‫It just exists already.

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‫Same with zero rotator and zero vector.

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‫So I'm going to close out of rotator h and we have this delta rotation and it's initialized to a zero

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‫rotator.

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‫Now your pitch and role are zeroed out just like X, Y and Z are zeroed out for the F vector.

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‫So we're going to need to change that your component.

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‫So just like I did with our delta location in the MOV function, let's create some pseudocode for delta

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‫rotations.

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‫Ya, we're going to want y'all to be set to value scaled by Delta time of course, because we want this

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‫turning to be frame rate independent, but we also need some sort of turning speed we can call this

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‫turn rate.

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‫So once we've set that, yeah, then we can add that local rotation which is going to rotate the actor

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‫according to the F rotator each frame and that ya will be scaled by value.

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‫So it'll be zero if we're not pressing any keys and it will have a value if we're pressing the DX and

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‫ax.

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‫So now you have a challenge.

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‫This is going to work just like adding the actor local offset.

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‫The only difference is we're rotating the actor now.

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‫So since we need some sort of turn rate for rotating the actor, you're going to create a turn rate

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‫variable, make this a float and put it in the private section right next to the speed variable.

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‫Expose this variable with you property and choose the appropriate new property specifiers.

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‫Now in the turn function you're going to set Delta rotation in particular, we care about the your component

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‫set the value equal to value times our turn rate variable and also multiply by delta time and then you're

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‫ready to call add actor local rotation passing in this f rotator now for the second parameter go ahead

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‫and pass in true for the B sweep input since we do want to sweep when rotating, pause the video and

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‫implement rotation for the tank now.

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‫Okay.

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‫So this is going to be fairly simple.

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‫We just need a turn rate variable.

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‫Now I'm going to go into tank just under speed and create float turn rate.

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‫Now you probably initialize this to some value and that's okay.

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‫If it's different than what I'm choosing, I'm going to go with 45 F and see how that works.

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‫But we're going to expose this to blueprints so we can change it while we're developing.

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‫Now I'd like it to be edit anywhere and I'm going to stick it in the same category movement as speed.

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‫So I'm going to go ahead and steal this you property and paste it right here above turn right so it

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‫set it anywhere.

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‫Category movement now and tank CP.

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‫I'm ready to set the yea for Delta rotation.

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‫So we're going to say Delta rotation.

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‫Yeah.

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‫And we're going to set it equal to value times, turn rate times, delta time.

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‫And of course we can get Delta time with U gameplay statics, get world delta seconds passing in this

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‫as the world context object.

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‫So I'm going to paste that right there.

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‫Now I know that my pseudocode doesn't exactly match.

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‫It's in the wrong order.

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‫Delta time is in the middle here.

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‫It doesn't matter because when multiplying three values together, you can multiply them in any order

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‫and still get the same result.

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‫So just in case you were wondering about that, the math will still come out the same if you multiply

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‫these three values in a different order.

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‫So don't worry about that too much.

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‫Now we have delta rotation.

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‫The only thing left to do is to call add actor local rotation, and we're passing in Delta rotation

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‫and for the second input we're going to pass in true to enable sweeping when rotating.

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‫So let's compile this.

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‫All right, we're compiled now.

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‫You may notice in a couple of the next videos that zero vector and zero rotator are missing from these

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‫lines.

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‫That's because I started off with these initialized and realized later that these should probably be

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‫initialized at least with zero values.

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‫So don't worry if you see these lines later looking like this on initialized, keep your zero vector

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‫and your zero rotator and you'll see that I catch this in a near future video.

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‫So don't worry.

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‫If you don't see these initialization ones, they should be there.

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‫And we're back in the editor.

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‫Let's hit play and I'm going to use the D key and we're rotating and the A key rotates me back the other

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‫way and we can also move forward and back.

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‫So now that we can rotate and move forward, we have the ability to move around the world.

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‫This is a great milestone.

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‫Now I'm moving quite slowly, but that's okay because I can select my tank and I can search for the

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‫movement category and change turn rate to something higher such as 90.

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‫So let's go ahead and hit play.

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‫And that's quite a bit faster.

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‫Now, if you think this is still a little slow.

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‫You can, of course, adjust these.

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‫So I'm going to select the -- tank again.

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‫And instead of 400, let's make it 800.

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‫Why not?

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‫Instead of 90, let's go to say 120.

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‫Now, if I press play, I'm quite a bit faster.

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‫So this is looking really, really good.

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‫So looking back at the section plan, we now have a tank that can move throughout the world.

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‫That first bullet point is definitely checked off and we're handling WASD movement.

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‫We're not handling mouse input just yet, but we'll get to that.

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‫But we're one step closer to making this game complete.

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‫So in summary, we learned what sweeping is and how we can enable that so that our objects do not pass

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‫through one another.

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‫We added an actor local rotation and we did this implementing a turn rate that we could adjust in the

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‫details.

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‫Panel in the editor to make development a little bit easier.

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‫Great job.

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‫We're now moving the tank throughout the world.

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‫I'll see you in the next video.