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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
Introduction to Java3D 3
Background Benefits: Prediction Unknown aspects of the study matter Cost effective
Introduction to Java3D 4
Background 3D Graphics One of important branches of CS Java 3D Involves advance OO programming
Introduction to Java3D 5
3D pool Simulator The data is provided
The physics of the game is known 3D Graphics
Somewhere to start! Pool has a simple Geometry
Introduction to Java3D 6
Objective: Simple presentation Accurate physics
Introduction to Java3D 7
Objectives Add involving physical factors one by one Start with main factors Abstract less important factors
Introduction to Java3D 8
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
Introduction to Java3D 12
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
Introduction to Java3D 15
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,
