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‫Back in this video.

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‫We are going to take care of our ball.

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‫So far, our ball is really just this little square here in the middle.

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‫And we need to change the functionality or we need to add functionality to him so that it flies from

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‫left to right, back and forth whenever it hits a record.

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‫And of course, we also want to have this bounce in it.

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‫So it should bounce off the racquets and bounce off the top and the bottom wall.

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‫It shouldn't bounce off the sidewalls for now.

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‫But we will add that functionality just for testing purposes right now.

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‫So let's go ahead and change our field as our ball needs to have a collider, which it does.

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‫And what we need to add is a material.

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‫So far we have no physical material for our ball.

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‫So what it is right now is simply a collision dot.

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‫So that means that if something goes towards the ball, it will collide with it.

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‫If you want the ball to move, we need to add a rigid body.

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‫If we want the ball to bounce, we need to add a physical material.

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‫So let's go ahead and create the rigid body first.

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‫So I'm just going to add a physics to the effect.

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‫And if I want to do that, if I want to use a physics to defect effect, for example, a rigid body

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‫to DX, I will run it to an error.

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‫So let's try that.

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‫You can see I can't add due to a conflicting component, which means our Box Collider currently is a

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‫3D box collider and a 3D box collider can't work with a 2D rigid body or with other 2D components.

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‫So that means we need to remove that component, remove our box collider and add a 2D box collider.

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‫So there is a 2D box collider here, as you can see, and that's what we want to use now as the offset.

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‫There is a very small value here.

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‫I don't want to have any offset at all, so let's get rid of that.

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‫So I go for zero here and now I will add a 2D rigid body.

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‫So rigid body 2D, which is the component which adds, for example, gravity, it adds a mass.

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‫Well, pretty much it makes it a physical object.

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‫So now it's not just the wall, pretty much what the ball was before with its collider.

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‫But now it's actually a physical object which can be dragged down by gravity, which can be influenced

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‫by physics.

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‫So now let's go ahead and create a physics material.

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‫Let's go with that.

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‫So we go back to our assets, we go to materials, and I'm going to create a new physics material to

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‫DX.

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‫And I'm going to call that one bull.

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‫You could, of course, call it ball physics material or something like that.

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‫I'm just going to keep it simple.

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‫That's the physics material that I want to use for my ball.

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‫Now that physics material has two different values one of one for friction and one for punchiness.

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‫The friction is pretty much how.

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‫How much does it wear of how much does the speed wear off when it, for example, rolls or slides over

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‫another surface?

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‫As we don't want to reduce the speed of our ball at all, we need the friction of zero.

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‫Now, the bounce in this means how fast or how strongly does it bounce back when it falls against a

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‫different collider?

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‫And here we need one because we want the ball to go with the same speed afterwards.

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‫We could, of course, say 1.1.

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‫That means that each time it bounces, it goes faster.

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‫But that's not what we want.

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‫We want to go for 1/1.

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‫So now that we have the physics material for our ball, we can drag it into its box.

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‫Collider So let's drag that right in there.

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‫So if we test that now and I'm going to use a gravity scale of 100 to speed it up a little bit, we

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‫will see that our ball will not do nothing.

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‫Well, it will drop, but it will not collide with the bottom, not with the bottom wall, at least.

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‫And that's because our bottom wall as other walls has a box collider and not a box collider.

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‫2D because our ball has a box collider two D It doesn't collide with 3D colliders.

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‫It really doesn't care about those three D colliders.

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‫It only cares about 2D colliders.

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‫So what we need to do is replace the colliders of all of our walls.

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‫So I'm going to remove that component and I'm going to add a physics to the Box Collider component.

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‫And that's what I'm going to do with the wall, top wall, bottom wall left wall right and wall left.

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‫So let's remove that component, add a box collider and do the same thing for all of them.

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‫And next, physics two D Box Collider and same here remove component box collider two DX Add Component

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‫Box Collider to DX.

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‫All right.

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‫So if we test that now, our ball should bounce off.

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‫As you can see, it bounces off our bottom wall and it does that with exactly the same speed as it did

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‫before.

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‫So it's influenced by gravity now.

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‫That's good.

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‫We will need to change that later on, as soon as our ball flies from left to right.

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‫So now what we could do is, for example, just for your taste testing purposes, we could change the

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‫bounce in to 1.5, for example.

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‫Now we see our ball bounces off faster than it did before and it drops down, drops off our map as well.

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‫So let's go back to bounce in this one.

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‫So it will bounce off the same speed and height that it did before.

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‫Now that we have seen that we need to dx physics colliders for our the objects that need to be influenced

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‫by the ball.

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‫We need to do the same thing with our rackets.

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‫So let's go with the records or change the records.

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‫Here we have a box collider here.

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‫We need to change that to being a box collider to DX.

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‫The same thing with the record to remove the component and add the component physics to the box.

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‫Collider So now you see those weird offset numbers and those values.

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‫What really matters is that the collider has the same size as the game object itself.

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‫That's what we get here.

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‫So let's reduce the offset, change the size to one and do the same thing.

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‫For our record, we don't need any offset and we just change it to one times one.

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‫Now our ball should bounce off the records and in order for our ball to fly from left to right, we

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‫need to add a script to the ball.

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‫Because so far it only is influenced by physics, which is based on this gravity scale that we have

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‫here, and we are going to change that in the next video.

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‫So let's go to the next video where we will add the script to our ball so that it flies left and right.

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‫See you in the next video.