Object Oriented Design

1
Object Oriented Design
2
Goals

• Feedback on The Sims
• How to make an object
• Working on Final Project

3
CS Dept. Announcement

• The newly-formed Computer Science Undergraduate
  Advisory Committee is holding an organizational
  meeting on Thursday, Nov 14, at 730 pm in ECCS
  128 (The L3D Lab/ Fishbowl). All undergrads are
  invited... the Committee will represent
  undergrads and their interests to help the
  department make wise decisions about improvements
  in facilities, advising and programs. Undergrads
  from all classes (fresh-senior-fifth year) are
  needed to participate!

4
Feedback for The Sims

• Great Simulations
• Some problems with documentation
• Graded liberally
• Sequence diagrams
• Need to capture goals, and intensions
• Describe interaction
• Fred is hungry gets to refrigerator
• Takes out some food (less food now)
• Fred is happy again

5
Example state chart

• Flower goals

Food seeking
Hunger satisfied
Getting hungry
Getting tired
Bed seeking
?
idle
Sleep satisfied
Getting bored
No longer bored
Entertainment seeking
6
How to make sprites and backgrounds

• Sprite game with pseudo 3D objects
• Use Bryce to make real 3D objects
• Export as image
• Import image in Photoshop and export as .png with
  transparency
• Example Asteroid Field
• Sprites can be use as Billboards in 3D games to
  reduce rendering time
• A billboard is a 2D object that will always face
  camera

7
How to make low polygon count objects

• Draw picture or get scans of object
• Polygonize object manually
• Generate list of coordinates (triangle fan)
• Generate textures and compute texture coordinates
• Create lists of
• glTexCoord2f ( 0.0f, 0.0f) glVertex3f(-1.0f,
  -1.0f, 1.0f)
• Example Car

8
Project group work

• Determine the set of objects used for your game
  (foreground and background)
• Assign one object to each group member
• Start to sketch object
• I am happy to prototype some image/texture using
  Photoshop or Bryce

9
Starting point for homework

• Use Solid Objects example (lesson 5) from NeHe
  tutorials to fill in object display methods
  http//agentsheets.com/courses/csci4448/projects/g
  l4java/SolidObjects.zip

10
Preview of Nov. 19

• Guest lecture by Tammy Sumner
• Work on scenarios
• Game storyboards
• You need to complete work described in work
  package in preparation

11
Homework (revised)

• PROJECT
• Make one object
• Use Game Engine http//schenkc.freeshell.org/clas
  ses/csci4448/contra/files/
• Each team member could make different object part
  of final project
• Apply Textures
• TEST applet (local and over network)
• Email URL to Alex Andri
• Due November 19
• READING
• Sumner workpackage
• OpenGL Red book chapter 9 Texture Mapping
• http//fly.cc.fer.hr/unreal/theredbook/
• Due November 19