Welcome, everybody, to CS50 on Twitch.

My name is Colton Ogden and today we're going to be taking a look at--

to depart from prior streams we're going to transfer or transition from 2D

and using Love and Lua to 3D and using Unity and C# today.

So a little bit of a transition from a dynamic

to a sort of statically typed languages and object

oriented programming languages, but should be a good time.

Some people in the chat already here.

So I see [? Bavik ?] is here.

So hello [? Bavik. ?] Good to see you again.

[INAUDIBLE] good to see you.

ForSunlight, good to see you.

We've got a bunch of people here.

[INAUDIBLE], nice to see you.

Thanks for joining us today.

Ann100, thanks for coming in again from Peru.

Good to see you, as well.

Yeah, we've got a lot of people in here already.

A lot of people are interested in Unity.

So if you're unfamiliar--

I'm going to transition to my desktop here--

I have a couple of things going on here.

I've got Unity in the background, but if you don't have Unity already,

you're going to want to go to Unity3D.com and then if you click

on this button that says--

I'll make it a little bit bigger so we can see a little bit better

here and zoom in--

it probably looks something similar to this if you're looking at this video

maybe in the future, should still be somewhat similar.

But on the front page is a Get Unity button

that takes you to a page where you can choose which version of Unity you want.

There's different versions.

There's a plus, a pro, and a personal.

Plus and Pro would be for if you're working for a company,

or not even necessarily a company-- well,

I guess probably it would be in a company situation,

but a small or a large company.

Or if you're just a hobbyist or making below a certain threshold of income,

you can go to the personal option.

Try Personal and then it will ask you to accept the terms and conditions

and then download the installer for your operating system,

or what's called Unity Hub, which is a fairly new thing that they've

done which allows you to actually maintain multiple different versions.

[? Bavik ?] says, "wow, yeah, I wish we could

get a certificate similar to professional development."

42Force, "hello Colton."

Hello 42Force, good to see you.

And Reema7 says, "Unity star."

Reema7, I don't believe I've seen you yet, so thank you for joining us today.

Got a fair number of people here already.

So yeah, it should be a fairly painless process, no matter what operating

system you're running.

But definitely go here.

Go to the front page.

Click the blue button.

Follow the instructions.

Download Unity Hub or the installer for your operating system.

I chose Unity Hub, just cause I think that's where

they're sort of trending towards.

They've made a lot of changes in the last year or so with Unity,

and that is one of them.

Once you have that up and running, which should be relatively

painless, although it might take a long time because Unity is rather large

and also comes with a bunch of different packages

for building games for different platforms, like for Android, for WebGL,

for Xbox, PS4, all sorts of different platforms.

Unity is amazing in that respect.

So it may take you a little bit of time.

But it's very much well worth it.

So once you do have Unity Hub installed, it

should look something like similar to this when you first open it up.

It'll ask you to log in, so you will need a Unity account, as well.

So I believe the Unity sign up link is fairly painless.

Looks like id.unity.com will allow you to actually create a Unity ID.

You will need to specify a username and a password and email or password

and then you will need to log in on your machine in order to use it.

But it is a free account and relatively easy to setup,

just like Unity personal is free and rather painless to set up.

42Force says, "from Manila in the Philippines.

Had to stay up and catch you again."

Thanks so much for staying up.

We're trying to make the streams a little bit earlier,

especially on the Friday streams where we do

the longer ones, the game dev ones.

So hence why we're starting at 1:00 today.

Often we start at 3:00.

So thanks for staying up.

I'm not sure what time it is in the Philippines.

Philippines time.

Right now it is 2:00 AM in the Philippines?

OK, wow.

Well, thank you very much for staying up that late to tune in today.

And feel free to go to sleep.

We will post the video later on YouTube.

And if you're watching on YouTube, you can tune in live at twitch.tv/CS50TV,

which will probably be in the YouTube description.

So once you have Unity Hub all set up, you have a Unity ID,

you've downloaded Unity Hub for your operating system

and it's taken you probably a half hour or so because it's a large download,

it'll look something like this when you go to create a new project.

So there's different tabs up here, all the projects that you have.

It has some tutorials baked in so that you can actually

walk through some preset projects, and then a bunch of different versions.

If you decide to-- maybe you have different Unity projects that have

different compatibilities--

you can go to the installs thing here.

You can also go to a new project, open a project, settings,

look at your account, blah, blah, blah.

The important thing is the new project because that's

what we're going to do today.

We're going to build a project from scratch.

We're going to look at pong in 3D today.

And actually, let me make sure my mixer is set appropriately.

It is not.

So I should-- now I should sound a little bit better.

I forgot to turn off my mixer.

So now I should sound a little crisper and not as weighty, I guess.

There shouldn't be as much background noise.

Let me know if that sounds any better.

It looks like now my volume might need to be turned up a little bit, actually.

So I'm going to do that, as well.

And then if all is good, we should be set to go.

42Force says, "thanks for checking."

I was genuinely curious.

I wasn't aware that it was that far east or west,

depending on how you look at it.

KeithSCH says, "hello from the UK."

Hello, Keith.

Thanks so much for joining us today.

Ann says, "it's lunchtime here."

It's about lunchtime here, as well.

OK, awesome.

This is worth to watch live, very engaging lectures as always.

Thank you so much.

I appreciate it.

That's why I love twitch so much.

We can have a sort of back and forth.

And maybe today we'll cooperate on sort of implementing this project.

So what are we doing today?

Well, we're going to make a version of pong.

So if you're familiar with what pong is, we teach it in my games course.

It looks something similar to this.

The image is not quite working the way that I wanted it to.

It looks like they changed their Google Images UI today, which is hilarious.

But it looks something similar--

and you can't see because of the chat, as well--

but it looks something similar to this where

you have a paddle on the left, paddle on the right,

or vice versa, because I'm currently flipped.

And the goal is to sort of make the ball bounce past your opponent's paddle

and strike some area beyond where it exists.

And that will trigger a point for you on your side of the screen

where you can see there's a score written there, four and two.

And it'll be something very similar to what we did today,

except we're going to do this in 3D instead of 2D

because Unity is, first and foremost, a 3D engine,

although it is a 2D engine, as well.

2D was not something it originally came with many years ago.

But as of the last few years, it's had quite a good solid set of 2D features.

But it's fun to explore it in 3D.

So that's what we're going to do today.

We're going to make a 3D version and we're

going to implement it from scratch.

I do have some notes that I took when I implemented it just

in case I do hit a stumbling block.

But we should be fine.

It's a fairly easy project to undertake, even as a completely beginner at Unity.

Although we will be doing some coding today.

So the nice thing about Unity is it does allow

you to not have to code as much as, say, Lua

and Love 2D, which is what we were doing the other day,

because that is a purely code-based framework.

It has no built-in graphical tools.

Unity is much more of all encompassing editor.

And we'll take a look at the editor tools and see what that looks like.

OK, I missed a few comments here.

Ann says, "yes, it sounds better."

Awesome, thank you so much.

[INAUDIBLE] says, "sounds better, yes."

ForSunlight, "our green tech teacher taught

how to make a real pong game in class, and I'm learning the virtual form."

A real pong game, that sounds like it would be much more difficult.

Do you mean, like, in hardware or, like, a physical-- like, how to make a--

like, actual paddles and a table?

Nobody ask long questions today.

There's nobody to read them.

I will do my best to read every question that comes through,

even the long ones, even the long ones today, just for you guys.

Agree.

"Played pong is an arcade game back in the '60s," says Keith.

Yeah, no, it's been around for a long time.

But it's such a great game to use as a teaching tool

because it has all the basics and it's still somewhat fun.

It's a nice, like, entry level piece of software to write, a game to write.

And we use it in my games course as the first game that we teach.

I'm going to come over here to the other laptop

and just plug my games course shamelessly.

CS50.edx.org/games.

We teach how to use Lua and Love 2D as well as Unity in that course.

And it's online on EdX for free.

The first game that we do in Lua and Love 2D is pong.

But today we're going to be doing it in Unity in 3D,

so it's going to be even better.

"Can't be sure, [INAUDIBLE]"" says Bavik [INAUDIBLE]..

OK, so I'm in my Unity Hub thing here.

I'm going to get rid of chrome here just because it's a little bit distracting.

I'm in 1080p today, as well, just because the 720p in Unity,

it can be a little bit cramped.

So we've expanded the size of today's background a little bit.

There's no CS50 dot--

or twitch.tv/CS50TV in the bottom left today.

I might find a transparent overlay I can plug over it.

But if you're watching on YouTube, twitch.tv/CS50TV again.

And that'll be the last time that I plug it.

So I'm going to specify a project name, 3D pong.

Just going to save it in my home directory,

which is the default location that Unity will store all of your projects.

You can specify whatever folder you want.

If you keep all of them in your home directory,

it's probably going to be a little bit crowded,

but I'm not too worried about it right now,

just because I'm not using this as a full production machine,

more just like teaching tool.

But if you have, let's say, maybe slash Unity projects in your home directory

or whatnot, that's a great place to put projects.