Objects and Meshes

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Из курса от партнера University of London

3D Models for Virtual Reality

107 оценки

University of London

3D Models for Virtual Reality

107 оценки

Курс 2 из 5 — Specialization Virtual Reality

This course will begin your journey to creating Virtual Reality experiences. A Virtual Reality experience is a new world that you step into and are entirely immersed in. Creating a VR experience means creating that world and all the objects in it. In this course you will learn the basics of 3D graphics: how we create objects and how to lay them out to create an environment. You will learn techniques like materials and texturing that make your objects appear realistic. You will also learn about audio techniques to ensure that your experiences sound great as well as looking great. In all of these topics we will pay attention to the particular requirements of Virtual Reality, including pitfalls and performance issues: making sure your environment runs fast enough in VR. You will learn all of this using the professional game and VR engine, Unity3D. Unity is one of the most used game engine and is a relatively easy, but fully featured, introduction to 3D development. The course will culminate in a project in which you will create your own VR scene. VR development is something you can only learn by doing it yourself, so working on your project will be the best way to learn.

Из урока

3D Graphics

This week you will begin developing 3D Virtual Reality Environments. We will cover the basics of 3D graphics, including a number of 3D engines and development environments that you can use. We will particularly focus on the Unity3D engine.

Unity User Interface6:14

Navigating in Unity4:55

Objects and Meshes2:32

Creating Objects in Unity | Primitives5:48

Creating 3D Assets2:22

The Asset Store8:54

Importing Assets From Unity and Other Places6:17

Познакомьтесь с преподавателями

Dr Sylvia Xueni Pan
Lecturer, Department of Computing
Goldsmiths, University of London
Dr Marco Gillies
Senior Lecturer
Computing Department, Goldsmiths, University of London

[MUSIC]

The virtual worlds that we want to create are essentially made out of objects.

They're made out of things.

Each of these objects has to be represented on a computer in order to be

rendered in 3D graphics.

We have seen how spaces and positions and points can be represented as numbers.

So any point in 3D space can be represented as an x, which is across, a y,

which is up and down, and z, which is in and out.

We can make use of this fact to build up objects.

Objects in 3D graphics are built out of points,

a whole bunch of points that are represented as an x, and a y, and a z.

These points are joined together to make lines, called edges.

These lines are then joined together to make 2D shapes called polygons.

And lots of these polygons are joined together to make a 3D surface,

called meshes.

Let me show you an example, this is a 3D object.

You can see in the little pink dots, these are points that define the shape.

We call these points vertices.

They're the corners of the object.

And you can see on the side,

one of these vertices has three arrows coming out of it.

These three arrows represent the x, y, and z positions of the vertex.

If you pull the green arrow you will change the x position, and

if you pull along the blue, you will change the z position of the vertex.

The lines in black join the vertices together and

they form the edges of the polygon.

A polygon is just a flat shape made out of a straight lines

just like I'm showing you now.

This object is made out of four-sided polygons called quadrilaterals.

Each of these polygons is four corners,

four vertices which are joined together to make four lines, the edges of the polygon.

These polygons are essentially squares that I messed around a little wee

bit to change the shape.

These flat shapes, the squares are put together to create a 3D shape.

Each quadrilateral is one side of this 3D shape.

Which was once a cube, and I've messed it around a little bit so

it's kind of a deformed cube now.

We call all the vertices and polygons the geometry of the object,

because it is the geometric shape.

And we'll come to other things as well as the shape in future lectures.

So the full shape is built up of polygons.

This can seem too simple, real world objects aren't made out of flat shapes,

they're curved or jagged or rough and uneven.

But actually building objects out of polygons can work really well,

because they're simple and they can be handled well on a computer.

Your graphics card can render millions or even billions of polygons every second.

And because you can have lots of polygons,

you can use them to make up really complex and rich and smooth curved surfaces.

[MUSIC]

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