Introduction to Java3D 1 3D-Pool Game Simulator CS491B Aslan Neishaboori

Introduction to Java3D 1

3D-Pool Game Simulator

CS491B

Aslan Neishaboori

Introduction to Java3D 2

Background Simulation: CS area of study CS and other fields hand-in-hand Needs data Provides simulators

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Background Benefits: Prediction Unknown aspects of the study matter Cost effective

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Background 3D Graphics One of important branches of CS Java 3D Involves advance OO programming

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3D pool Simulator The data is provided

The physics of the game is known 3D Graphics

Somewhere to start! Pool has a simple Geometry

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Objective: Simple presentation Accurate physics

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Objectives Add involving physical factors one by one Start with main factors Abstract less important factors

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What are the factors? Gravity Cue Friction Velocity Rotation, Spin Elasticity of collisions ….

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Spin and Translation!

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Linear and angular velocity +Friction!

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Simplify: Create a simple working model first Add more functionality to that model

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Code! Geometry classes Initialization classes Auxiliary classes Behavior classes Collision detection classes

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Scene Graph? A scene graph is a tree-like data structure

that stores, organizes, and renders 3D scene information (3D objects, materials, lights, behaviours ...). It is not a tree It has nodes and arcs (connects the nodes) Nodes are java classes

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Content Branch View Branch

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BG

TG

TG TG TG TG

TG

TG

TG

TG

TG

Content Branch

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Actual code TransformGroup + shape3D’s

BallTG() CueTG() tableGeometry() TableTop() Outlines()

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Initializing other classes: Initz_balls() CompleteTable() Init_Cue()

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Transformations: Translation Scaling

Reflection Rotation

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3D RotationThe 3D rotation matrices about each coordinate:

1

0

0

0

0

cos ( )

sin ( )

0

0

sin ( )

cos ( )

0

0

0

0

1

About x-axis (x-roll)

cos ( )

0

sin ( )

0

0

1

0

0

sin ( )

0

cos ( )

0

0

0

0

1

About y-axis (y-roll)

cos ( )

sin ( )

0

0

sin ( )

cos ( )

0

0

0

0

1

0

0

0

0

1

About z-axis (z-roll)

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Behavior Classes: StickMouseTranslate() StickMouseRotate() CueBallCollision() KeyNavigatorBehavior() in pool1() class

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Problems JAVA 3D API is complex Collision detection Communication between live nodes

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Final word 3D pool covers the whole Java 3D Good practice for OO programming Open source / Online project and….

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Thank you,