Posture and Gesture

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来自 University of London 的课程

Building Interactive 3D Characters and Social VR

21 个评分

University of London

Building Interactive 3D Characters and Social VR

21 个评分

课程 4（共 5 门，Specialization Virtual Reality）

Meeting another person is one of the most amazing experiences you can have in Virtual Reality. It is quite unlike communicating through any other medium except a real life face-to-face conversation. Because the other person is life size and shares a virtual space with you, body language works in a way that cannot be done on a flat screen. This course will enable you to create realistic social interactions in VR. You will learn about both the psychology of social interaction and the practical skills to implement it in Unity3D. We will take you through the basics of 3D character animation and how to create body language. You will learn about how to make characters that can respond to players’ speech and body language. You will also learn about avatars: the virtual representation of other players, and agents: computer controlled NPC characters and how to implement both of them. As many people have said before us, social is the future of VR. This course will help you become part of the future of Virtual Reality social experiences.

从本节课中

Body Animation in VR

In this module you will learn about the role of the body in social interaction and also about how to animate and control virtual characters' body movements.

Introduction to Body Language1:52

Introduction to Skeletal Animation5:18

Introduction to Motion Capture3:38

Posture and Gesture4:15

Backchannel4:25

Sensing the User’s Body Language2:11

Body Language for Avatars5:52

与讲师见面

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

[MUSIC]

We use our body in may ways during social interaction, and

it can communicate many different things.

>> In this video, we'd like to talk about two of the most important ways to use our

body to communicate, through gestures and through postures.

>> Gestures are movements we make while talking, mostly with our hands, but

sometimes with our heads or other body parts.

>> Gestures can be meaningful.

They can add extra meaning beyond the words we say.

For example, some gestures have very definite meanings, like an OK sign, or

thumbs up.

These are called iconic gestures.

>> Iconic gestures can vary a lot between cultures.

Nodding and shaking your heads can be yes and no in western cultures, but

in India, head shaking gestures mean agreement.

My mother is from southern Italy,

where there is a very rich vocabulary of gestures.

Whether it's complimenting the cook on an excellent meal,

or asking for clarification, maybe not in the most polite way.

>> When I first came to the UK when I was 22, I have discovered the use of

shoulders in expressing certain emotions, something we don't really do in China.

Also, I was very used to counting from one to ten with one hand.

So this is how I count six, seven, eight, and nine.

I was really surprised to discover that this is not the case outside of China.

>> Iconic gestures act a lot like words,

they have definite meanings that people understand when you make them.

>> But gestures can convey information in other ways

that might be hard to put into words.

>> For example, I might say, I'd like the pink cupcake on the top shelf

between the chocolate cake and the lemon tart or I could just point to it.

>> Pointing is a very important communicative gesture that we

use all the time.

>> Some gestures, on the other hand, don't mean anything at all.

Most of the gestures I am making while I talk are called beat gestures.

They mark the rhythm of my speech, and they can provide emphasis but

they don't really mean anything.

>> All of the gestures we've been talking about are very closely linked to speech.

Sometimes, they can substitute speech, but they mostly accompany and enhance it.

The timing and rhythm of gestures is closely synced to that of speech.

>> That means if you want characters to do gestures,

then we need to create them together with speech.

If we're generating speech with a chatbot, then we need an algorithm

to dynamically generate gestures to go with it which can be pretty hard.

When I talked about speech, I recommended you use prerecorded audio clips.

For gesture, you can use prerecorded animations.

>> Ideally, you would record audio and

motion capture the gestures simultaneously to make sure they're fully synchronized.

But that needs equipment that is beyond the reach of most people.

Instead, you can get hold of clips of gestures and

do your best to make sure they match the speech.

>> Gestures and movements and particularly parts of the body normally hands.

Posture, on the other hand, is the pose of the whole body when it doesn't move.

>> Posture is less of a directly communicative channel, but

it can express a lot of things, for example, emotion.

We can easily recognize a sad, dejected posture,

and distinguish it from a proud posture.

>> Light gestures the easiest way to generate posture is to

use pre-recorded animations.

Maybe selecting different animations to convey different emotions.

>> An easier way of combining posture and gesture is to use layers.

That means, splitting the body into different parts and

applying different animations to each part.

For example, gestures applied to the arms and

posture animation applied to the torso.

>> If you've got to grips with character animation, then posture and

gesture are a good place to start using body language because they mostly use

the basic techniques.

But with them, you can create expressive body language for

your social VR character.

[MUSIC]

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