Game Animation - 國立臺灣大學

Ken-Yi Lee

Game Programming, Fall 2020 @ National Taiwan University

Game Animation

2

Game Programming

● Rendering

● Looping and control

● Math

● Animation

● Physics

● Behaviour and navigation (AI)

● Effects

● Networking

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Game Programming

● Rendering

● Looping and control

● Math

● Animation

● Physics

● Behaviour and navigation (AI)

● Effects

● Networking

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2D

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Demo : 2D Game Kit

● Play

● Introduce scene assets

2D sprite animation

● Keyframes / image sequence

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Sprite renderer

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Demo : 2D Game Kit

● Inspect Ellen [Prefab]

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Animation clip : keyframe animation

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Demo : 2D Game Kit

● Inspect Ellen prefab

● Inspect Ellen_Idle animation

27Source: Unity Learn

28Source: Unity Learn

Tight ?

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Root motion

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Root motion

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Root motion

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Root motion

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Demo : 2D Game Kit

● Inspect Ellen prefab

● Inspect Ellen_Idle animation

Parametric animation

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Parametric animation

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Interpolation between consecutive frames ?

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Smooth or sharp ?

Parametric animation

Animation clip: Curves

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● (DEMO) Ellen [Prefab] > Animation > Ellen_IdleWithGun

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(DEMO)

State machine

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● Current state ?

● On state enter / leave ?

Jump

Idle

Walk

State machine

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● Current state ?

● On state enter / leave ?

● Transition between states ?

Jump

Idle

Walk

Animation state machine

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● Current animation ?

● On animation play / finished ?

● Blending between animations ?

Jump

Idle

Walk

Animator controller

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Animator states

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(DEMO)

Animator transition

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BlendTree

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V1

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V2

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V3

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V3

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V1

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(DEMO)

Inverse kinematics (IK)

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Inverse kinematics (IK)

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Set desired target

Inverse kinematics (IK)

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Always possible ?

Set desired target

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(DEMO)

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3D Model

Skinned mesh renderer

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Rig

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(DEMO)

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Avatar

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(DEMO)

Root motion

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(DEMO)

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(DEMO)

BlendTree

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(DEMO)

Retargeting

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(DEMO)

Inverse kinematics (IK)

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Inverse kinematics (IK)

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Inverse kinematics (IK)

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Q & A

References

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● Getting Started with Unity’s 2D Animation Package @ Unity Blog

○ https://blogs.unity3d.com/2018/11/09/getting-started-with-unitys-2d-animation-package/

● Mecanim Humanoids @ Unity Blog

○ https://blogs.unity3d.com/2014/05/26/mecanim-humanoids/

● Retargeting and Reusing Animation @ Unity Blog

○ https://learn.unity.com/project/re-targeting-and-re-using-animation