# Quorum Game Development #30 – Introduction To 3D Games in Quorum

What is up, guys? This is Josh the Gamer
here coming at you with a brand new video. So today in this
video, we are going to be starting on our 3D aspects
of the Quorum game engine. Now, to start off
with, why didn’t I create a separate tutorial
series all together for 3D games? Well, that’s simply because the
3D portion of the game engine is still game development. So it would be kind
of pointless for me to create a whole
separate series for the 3D portion of the engine. So I’m just keeping the 2D
and 3D all in one series. So just so you guys know that. Now that we have
that cleared up, in this tutorial
for 3D games, we are going to be covering
the intro stuff to 3D. The biggest thing
that we need to look at when it comes to beginning 3D
games is the coordinate system. Now, when it comes to
a 3D coordinate system, there are two different types. There’s a left-handed
coordinate system and a right-handed
coordinate system. Quorum uses the left-handed
coordinate system. Now, the left-handed
coordinate system pretty much says that the x
increases to the right. X decreases to the left. Y increases upward. Y decreases downward. And then the z increases
going away from you. And the z-axis decreases as
an object goes closer to you. However, the right-handed
coordinate system says the z value
decreases as it goes away from you, whereas it increases
when it goes toward you. And then the x and y are
pretty much the same. X increases towards
the right, x decreases towards the left, y
increases going upward, and y decreases going downward. Now, when it comes to
drawing 3D objects, we have to understand this 3D
space, because a 3D space is– you have three different
the x and the y-axis anymore. We’re dealing with x,
y, and z-coordinates. So we have to be very
careful about where we’re placing our stuff,
because sometimes we could place it so far away that
we don’t even see it anymore. So now, a 2D object has a width
and a height, as you guys know. However, a 3D object
pretty much will have a width, a height, and a
depth, therefore making it 3D. In 2D animations, the position
and size of an object– they can be explained
using two measurements. Using one horizontal
across the center and then the one vertical
across the center of the screen using the y-axis. Now, when we add a third
measurement for 3D, it will pretty much run from the
user through the screen almost. You’re getting further away. Getting further away. So as you can see, I
have a little image here. This is an image from
the Quorum website. I will leave a link down in the
video description to the Quorum website where you
can find this image. This is demonstrating the y-axis
in blue going up and down, the x-axis going left and
right, and then as you can see, the z-axis is kind of hard
to draw for obvious reasons, but they’ve kind of made it
have somewhat of a 3D effect, where the z-axis is going
towards the monitor, goes through it, and in
and out the other side. That’s pretty much a
good way to explain the z-axis is it’s depth. It’s not width, it’s
not height, it’s depth. Now, all 3D modeling is pretty
much based on these three axes. And you can’t just focus on two. It has to be all three of them. And of course,
different programs will use them differently
depending on the program. So that is pretty much
your basic tutorial on getting started
with the 3D games and understanding the coordinate
system and that kind of stuff. Because with 3D
games in Quorum, you need to understand
this coordinate system. Otherwise, you are not going to
know what the hell is going on. So anyways guys, thank
you all for watching, and we will see you all
in the next tutorial where we will be learning how to
draw a box using the 3D game engine in Quorum.