1. Java 3D Pablo Figueroa University of Alberta http://www.cs.ualberta.ca/~pfiguero/english/ April 2000

2. Contents Introduction What is java 3D API concepts Some demos API details Summary More resources

3. Introduction: What and Why? What? Represent 3D geometry Interact with 3D information Why? Application specific reasons: Design Architectural walkthroughs Analysis of 3D data

4. Introduction: Examples Macy’s fashion show http://www.excitextreme.com/fashion/ Interactive animations (cult3d) http://www.cult3d.com/gallery/references/index.html

5. Introduction: Examples (2)

6. Introduction: Examples (3)

7. Introduction: Solutions APIs OpenGL, Open Inventor, Performer, Java 3D 3D modeling tools 3D Studio Max, Maya, … VR environments WTK, DIVE, … App. specific tools Cult3D, Character Studio, Rodin, …

8. What Is Java 3D? Java API for 3D geometry description Platform independent File-format independent A scene graph API Describe the intended use of the model: Modifiable vs. static objects Selectable vs. background objects Abstract device model

9. API Concepts Scene graph Shape (geometry, appearance, texture) Transforms Lights Sound Behavior Rendering model

10. Concepts: Scene Graph Objects are described as a hierarchy of nodes: Leafs: shapes, lights, sounds, behaviors Intermediate: transformations, groups Group Switch Ordered Shared

11. Concepts: Scene Graph (2)

12. Concepts: Shape Geometry Some primitives Box, Cone, Cylinder, Sphere Indexed face sets Coordinates, normals, colors per vertex, texture coordinates per vertex Appearance Color, material, texture Point, line, and polygon appearance

13. Concepts: Transforms All geometry coordinates are defined relative to (0,0,0) Translation Rotation In radians Scaling

14. Concepts: Lights Based on the Phong model At least one light in the environment Several types: Ambient, directional, point, spot Attributes: Color, influencing bounds Uses material attributes: diffuse, ambient, specular, emissive colors

15. Concepts: Sound Spatially located sound information Several sounds Soundscape (aural environment) Types: Background, point, cone Attributes: Volume, loop parameters, scheduling region, active flag, distance gain (point and cone)

16. Concepts: Behavior Actions in the world: Object animation Input processing Picking Collisions Level Of Detail (LOD) Interpolations

17. Concepts: Behavior (2) General attributes: Scheduling region Wake up conditions View position, transform state, collision, other behavior’s state, AWT events, time interval, sensors Interpolator classes: Position, PositionPath, Rotation, Color, Transparency, RotPosScalePath

18. Example: SimpleSounds An extension of HelloUniverse A cube 3 sounds 2 behaviors: rotate the cube, play sounds

19. SimpleSounds (2) sound1:PointSound TransformationGroup ColorCube RotationInterpolator BackgroundSound BranchGroup sound2:PointSound SimpleSoundsBehavior

20. SimpleSounds (3)

21. Demos From the distribution ObjLoad Loads geometry in format.obj AWTInteraction 2D interface widgets with 3D worlds TickTockCollision Behaviors, collision detection

22. Demos (2) From the website YouBuildIt Author environment Astro3D (Astronomy Visualization Tool) Navigation + Collaboration Particles Particle-based system

23. API Details Rendering model Immediate Retained Compiled-retained Hi-resolution coordinates 256-bit fixed-point numbers (hundred-billion light years – protons)

24. API Details (2) Scene graph in detail: objects

25. API Details (3) Scene graph in detail: View model

26. API Details (4) Devices Standard API for keyboard and mouse New model for input devices InputDevice Interface Sensors Math library Tuples, angles, quaternions, matrices

27. API Details (5) Capability bits User’s intention for each part of the scene. Used for compilation purposes Read/write Transformations, geometry, path, … Collision bounds Sound data

28. API Details (6) Cloning groups in the scene graph:

29. Summary 3D, scene-graph based API Compilation capability for performance Integration of other input devices View modeling allows VR apps. Sun, Windows, Linux, and SGI implementations

30. Summary (2) http://java.sun.com/products/java-media/3D/collateral/j3dclass.html

31. More Resources Java 3D site http://java.sun.com/products/java-media/3D/ Java 3D related stories http://java.sun.com/features/#3d Java 3D tutorial http://java.sun.com/products/java-media/3D/collateral/#tutorial Java One 99 presentation http://java.sun.com/products/java- media/3D/collateral/j3d_javaone.pdf http://java.sun.com/products/java- media/3D/collateral/j3d_javaone.pdf Java Technology Roadshow http://java.sun.com/products/java-media/3D/collateral/j3d_clas.pdf