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In this video we're going to implement the ground slide ability.

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In this type of Megaman clone games, you usually have a slide that just makes you go faster and maybe

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has other properties.

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So we also want to implement this.

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But making something slight on the ground is actually surprisingly hard.

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In Unreal Engine.

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We've already used the launch character node before, and most tutorials you see will actually use this

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node for sliding.

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However, that is a very bad implementation.

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The problem with this is that you have to set it to a super high value to work against ground friction,

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but if you then use the slide near a latch, you're just going to fly off super far away.

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The best way for things like this is actually something like root motion.

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However, with 2D animations you don't really have root motion.

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That is more a 3D concept, and also you cannot control baked in root motion.

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So this is more like a root motion like solution that comes from the gameplay ability system.

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And you can look up the gameplay ability system of Unreal Engine.

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And it is a really big plugin that gives us many other features.

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However, we don't want to use this because this is very bloated for only wanting to use this one node.

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So I actually made a free plugin that only extracts the one node that we need for this root movement

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type of thing.

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And I'm going to show you how you can quickly install a free plugin like this.

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And then we're going to use it to actually implement the ground slide.

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I actually also made a YouTube video about this topic, which also shows examples from other real games.

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So you can also check that out in the resources.

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I'm not sure if it's already released by the time this course is out, but I will attach it once it

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is available.

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The plugin is called Root Movement and I'll attach it to this lesson in the resources, so please download

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it now.

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If you bought this course, of course, you can also feel free to use this plugin for all of your other

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projects.

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After downloading it, you should have this zip file again.

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We want to unzip this so extract.

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And in here we can just have a look.

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We have the root movement you plug in, we have the resources.

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And all of the files are in here.

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Right.

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So this is a packaged plugin that can be used in C plus plus projects and in blueprint projects as well.

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So how do we use this.

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Well we can go back to this folder the root movement 5.3 and just hit control X to cut this out.

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And we now need to add this plugin into our project.

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So this is not going to be an Unreal Engine version based plugin like paper Z and paper 2D.

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This is going to be a plugin we put specifically into this one project only.

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And we could then also develop this plugin alongside our game.

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The easiest way to find your project is to just find the project and right click and show in folder.

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And in here we then want to right click again and create a plugins folder.

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So new folder plugins and double click to open it up.

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And now we just paste our root movement plugin in here control and V.

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And for this to take effect, we actually have to restart our Unreal Engine project.

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So please do that now.

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Just go to the project and make sure that everything is saved.

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Save all and exit out.

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And then just open up your project again.

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And now you might get a message that says new plugins available and you can just click on Manage Plugins.

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Also, if it says project files out of date, just click on update and open the editor.

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This doesn't matter, right?

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But we can also just go here to edit and plugins.

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And now we just look for the root movement right.

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So this is the new root movement plugin made by Cobra Code.

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And it is already active because we restarted the project.

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And we can then see this in our content drawer.

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If we collapse the content we see the plugins folder here now right.

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And in here we have the root movement content, the root movement C plus plus class.

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And this is actually a C plus plus plugin that I created.

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If you have Visual Studio and everything installed you can actually look at the code in here if you

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want to.

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And you can get a better understanding of how this works.

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But we're not going to get too much into it.

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We're only gonna go over how we can actually use this in our blueprints.

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So how do we use this?

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Well, this has a function library.

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And what a function library does.

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Is it makes certain functions available in all other blueprints.

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And this is how I set this up.

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So simply by having this installed in the plugins folder, I can now access this in any blueprint that

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I want to.

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And we want to access this of course in the player.

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So blueprints characters player and go to BP player.

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And in here we now want to.

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Well, first of all, we want to go to the event graph and look for our jump for the IA jump.

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And the way we want to trigger the slide is if we press jump while down is also being held.

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But for now, let's just use this on jump and just see how it works.

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So for now, we just click alt and here and stop the jumping.

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And instead we just want to use this for the sliding.

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Now for testing.

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And I can just drag off here and just type in root motion.

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And here we have these two functions the apply root motion constant force and apply root motion constant

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force with callbacks.

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And these are the two functions I created which are in this plugin.

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So the first one doesn't have any callbacks.

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And this is a monstrosity if you look at it first because it has a lot of functionality built in, you

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don't need to understand everything that happens here, but just the basics.

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The one problem with this though, is that it only has an input and an output.

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It doesn't tell us when the event is over, it doesn't give us a way to cancel the event.

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But if you just want to trigger something and just let it happen, don't worry about it anymore.

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You could use this, but we actually want to be able to cancel the slide if we get hit or get stunned,

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for example.

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So again, we want to look for root motion and we want to apply root motion constant force with callbacks.

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And this gives us and actually connect to the right side.

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For some reason I go from started to the left side and then disconnect this in case this also happened

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for you.

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And this actually gives us the Oncompleted event, the on fail event.

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And it also gives us the async action.

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And here we can actually call cancel.

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So if we get stunned or something happens, we can just link in here and cancel the slide.

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The slide movement.

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So this is very important.

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But for now let's just try it out.

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What happens if we put something in here.

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Right.

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So the first important thing is that we need the character movement component, which we want to call

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this root motion on.

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So we can just grab the character movement and pass it in here.

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Otherwise nothing is going to work.

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So this is very important for the world direction.

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We can just get actor forward vector.

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And this is just going to give us a x of plus 1 or -1 for left or right.

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Strength is of course how much power we want to give the movement.

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And for now just put in like something like 700 for testing.

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And the duration is of course, how long the slide is going to be or the movement.

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Right.

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Because you could also use this for other types of movements.

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And I think 0.2 is a good value to start from.

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And the rest is actually not so important.

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These are just additional things.

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Features we can use.

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You could pass a curve, for example, to make this light start out very fast and slow down over time.

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We could carry on the velocity if you jump out of the slide like in Donkey Kong games in the Donkey

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Kong country, uh, remakes.

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This is a very, very often used gameplay mechanic where you just use your dash kind of to build up

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momentum, and then you jump out of it to carry that momentum into your jump.

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And this is what happens if we maintain the last root motion velocity.

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So I like the setting.

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You could clamp it.

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You could set it all of these things.

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And also important is the enable gravity.

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So if you want to make an air dash or something like that which should ignore gravity, we can just

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keep it off.

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But we actually want to make a slide.

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So if we slide off a ledge we actually do want gravity to take effect.

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So we want to check this and set it to true.

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Right.

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So now we set up the basic things here.

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Let's just try it out.

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Go to the map and I press jump or Space.

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And you can see we get this nice little slide right.

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And you cannot steer against it and things like that.

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Right.

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It kind of takes over your character.

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But we aren't playing the animation yet.

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But this is working.

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So this is the movement itself.

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It is working.

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So now that the slide itself is working, we want to just use this for the jumping again, right?

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We can just use the started for the jumping again.

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And we actually want to introduce a branch here so that if we press jump and our holding down we then

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want to execute this instead.

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But we actually don't have an input for up and down assigned yet.

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So we first need to do that with the input system.

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Go to the content drawer and the content input folder and actions.

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We already have the IA move right?

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But because we can only walk left and right in our game so far we only set it up as an axis mundi.

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But actually now we also want to have the down and up input, the down input we want for the sliding,

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like I said before, but later on we are also going to implement ladder climbing and for climbing.

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We also want to have the up input as well.

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So we can just go from axis 1D now and go to axis 2D.

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So this will give us left, right, up and down at the same time.

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And we want to save this and go to the input, the IMC action.

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So nothing has changed yet, but we are now able to also put in more buttons for up and down.

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Right?

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So under the I move I now want to implement the button for up.

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First let's just do this and add one here and put it to W.

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And the default axis for movement is left and right.

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So that is y D and A are working.

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But for w we need to add another modifier.

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So for modifier we actually want to use the swizzle input axis values.

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And this just lets us go from an x axis to a y axis.

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And this is all it takes because for the y axis up is the default direction.

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So then add another one.

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And here instead of w we want to click on s.

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And s is the down button for wasD controls.

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And again here we need to swizzle on the modifiers.

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Swizzle input axis to go on the y axis.

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But here we also need to negate like we did for the A right.

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Because A is left, we had to negate it, as you can see here.

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So for the S we just do the same thing.

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Just add another one on top of swizzle.

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We also want to negate and then just save this.

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If we go back to our blueprints.

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Now compile and save, we're actually going to get an error right.

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So this is well we can just click here to see what's going on.

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And the problem is that our IA move now turned into a vector 2D.

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So we can actually start at the first one.

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Right.

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So the uh enhanced input IA move.

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Now these uh now these pins don't match anymore.

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So these are for the X right.

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We want the x.

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So here we can just disconnect this and we right click and break uh split struct pin.

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And now we can split the x and the y.

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So here we need the x right for the left and right movement.

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And for the rotation.

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We just need the x and the y we can then use for other things later like the ladder climbing.

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But now just compile and save.

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But there's still something left here like the float times float right?

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Because for the tri wall slide, if we check if we are looking towards the wall and pressing towards

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the wall, we also just check the x.

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So here we can again disconnect this hold alt and left click.

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And here split the struct pin and we only use the x.

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In this case we don't care about the y at all.

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And we can just compile and save.

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And for now let's just go in here and everything works again, right?

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We can walk.

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The wall slide is working.

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The jumping is working again.

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But now we have set up the inputs which we can use for the climbing and also for the sliding.

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So now let's set up the sliding.

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And again in the BP player this getea move.

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We actually want to use this for the slide as well.

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So we can just copy this and go to the event graph.

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And we can look for our IA.

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Jump right to teleport here.

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And now here we want to add yet another branch.

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So first we just check for is wall sliding.

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And if we are not wall sliding well then we want to check.

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Are we holding down.

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And then decide do we jump or do we slide.

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So here we can just drag off and branch another time.

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And here we can just, uh, control V to put in our get move.

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If you didn't copy it, we can just look for get IA, move here as well and use this.

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And here we just want to check if the Y which is the up and down if this is less than zero.

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Right.

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So this means we are currently holding down.

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And I can just add a comment here is holding down.

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Add a small o.

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Like this.

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Right.

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So if we are holding down, I actually want to change this.

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So hold Ctrl.

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And if we are not holding down we want to jump.

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This is fine.

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If we are holding down well then we want to slide.

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So we can use this here this monstrosity of a node.

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And if we are holding down while jumping, well we can do the slide instead.

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Compile and save.

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And let's check this out.

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I'm not holding down, I'm just pressing jump.

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I'm jumping, I'm holding down.

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And now kind of sliding over to the side.

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Right.

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Jumping.

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Sliding.

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One problem you might notice here is that if I press down now, the character just starts looking to

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the right side, even if I just press down and no direction.

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And this is actually related to the changes we made to the 1D and 2D axis.

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So let's just fix this quickly.

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We can fix this on the IA move event.

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So here we can just look for IA move.

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Uh, not the getai move, but the input action.

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So what changed now is that this triggered is not only active if we press left or right, but this is

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actually also activated if we press up or down.

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And this means if we press up or down, this access value for x is going to be zero.

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So inside of this update rotation we had this check of if bigger or equals than zero we look to the

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right.

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So if we press up or down this is going to be zero.

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This is going to be triggered.

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And we're going to look to the right side.

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So we have to add one more branch in here to check that edge case.

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So here we can just branch.

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At a branch here, and we want to check that the direction does not equal zero.

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Like this.

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And just like this.

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Right.

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And here we also got to be careful with the float rounding issues.

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But actually this worked out for me.

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Like I don't have to check the nearly equal.

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Right.

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We could also put in the nearly equal.

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But actually this one worked out for me in this case.

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But it is something we should keep in mind with the floating point errors that are common in computers.

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But for now, this is working fine.

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And let's try this out.

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Now, if we go here, right, I look to the left, I press down.

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It is fine.

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We don't flip to the other side.

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And if I hold down and jump, we can slide left.

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If I turn it to the right, hold down and jump, we can slide.

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And if I just jump, we can jump while walking, right?

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So we have not technically implemented the slide.

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Of course we still want to polish it up, but we can jump, we can slide, we can turn around, we can

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wall slide.

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All of this is still working.

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But before we start polishing up the values we use for the slide, I first want to implement the animation

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because things are just easier to understand once they actually look like sliding.

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So go back to the BP player and for the Aya jump, go to the Aya Jump event.

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And here.

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Right.

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So before we start sliding, like we did for the wall slide, we want to use a boolean to save the state.

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Right.

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So here we just create another variable and just called this sliding or just call.

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It is ground sliding to make sure there's no confusion.

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And if we press the button here right.

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We set this ground sliding to true.

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And then we go into this animation.

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And we then want to set this back to false, which is great that we have the callbacks here, right?

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We don't want to do this here because this happens right away even before the force ends.

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So oncomplete we want to set it to false and on fail.

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We also want to set it to false.

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The sliding right.

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So this is just a nice way we can handle the animation through our callback events.

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Now of course we also need to add this to the animation blueprint.

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Go to the content drawer in the blueprints characters player.

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The ABP player.

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We now want to add a new state for the sliding.

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So here from the idle we can go to the animation state.

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And add in slide here and just open it up and here just play slide.

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And for sliding there is no shooting.

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We are going to prevent shooting while we are sliding.

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So just play slide here.

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And go back out.

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And the condition here, of course, is from the idle owning player is sliding.

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And I think we just have to compile and save because it doesn't know about this variable yet.

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And actually it was my mistake.

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It is called is ground sliding.

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And this is the transitional condition here.

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Right.

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And we can copy this, go back out to locomotion and to go from sliding back to idle, we just do the

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same thing and go here and just copy paste this in and then just use the not boolean to completely flip

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it around.

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And we can then just connect this here.

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Right.

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So we can go from idle to slide and from slide to idle.

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But actually it is also very common from run actually more so common to go into the slide.

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So we can also go from run into the slide.

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And we can just copy these conditions.

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The is ground sliding to go here and just do this.

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And now you'd think that maybe we also have to go from slide to run.

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But actually, like I said before, if we end the slide, it's going to go to idle and it's going to

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try to go to run right away.

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It's going to evaluate on the same frame.

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So we're not even going to get like a single frame of idle if we are able to run.

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And this is just a cleaner way.

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Of course, we could also go back, but it would have the same result.

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Now let's try this out.

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Go into the map, hold down and jump and you can see the nice slide animation.

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It is aligned correctly already, right?

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Like all of this is working out nicely.

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And now we can tell the slide is a little bit short.

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So we might want to adjust some values to make it more useful.

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But it looks cool.

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It is working out.

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Now back in the player.

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We just want to change a couple of these values, right.

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So I want to change the duration to 0.3 to make it a little bit longer and also make it stronger.

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So strength of 1000.

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00:19:03,760 --> 00:19:07,030
And of course these should again be variables.

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So from the strength we can just drag off promote the variable.

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And it's called slide strength.

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And drag out from the duration and just call it slide duration.

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And just like this and test it out again.

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Compile and save.

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Go back in here.

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And yeah.

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So this is a more useful slide from a gameplay perspective.

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And yet everything else still works.

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And this kind of showed you how we can use a custom made plugin to use it in here.

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And to overcome this like very hard problem of sliding by using the root motion that is built into Unreal

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Engine.

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However, you would have to install the whole gameplay ability system, which is a very complicated.

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But through my plugin you just get easy access to the one node that we need.

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There are still a couple of edge cases and problems with the slides.

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In the next video, we're going to make some adjustments to it and improve it even further.