Graphics Qubed

1
Graphics Qubed

• SCE Presentation of
• Epoch Relic of Time

2
Introduction

• Team Graphics Qubed
• Roles
• Team Leader ( Audrey Wells )
• Lead Architect and Tester ( Sean Matthews )
• Configuration Manager ( Peter Dudek )
• Project
• 3D Graphical Computer Game
• Epoch Relic of Time

3
Outline of Main Points

• Initial Goals
• System Structure and Design
• System Features
• Problems Encountered
• Demonstration of Game

4
Initial Goals Completed

• Simple 3D Adventure-RPG Game
• Multiple levels, each containing several rooms
• Variety of textures to make interesting levels
• Objects and characters to interact with
• User Interface for inventory objects
• Story screens between levels

5
Initial Goals Eliminated

• Artificial Intelligence for characters
• Health levels and other player statistics
• Hazards that lower player health
• Expanded User Interface

6
System Structure and Design

• Object-Oriented Design
• Tools
• C Programming Language
• OpenGL Widely used API (Application
  Programming Interface) for 2D and 3D graphics
• Object Classes

• Interface Class
• COGLTexture Class
• Main Module

• Level Class
• Tile Class
• Player Class
• Item Class

7
OpenGL Sample Code

• void TiledrawPit(int x, int y, COGLTexture
  tex)
• float t tileSize
• tex.SetActive()
• glColor3f(1.0, 1.0, 1.0)
• glBegin(GL_POLYGON)
• glTexCoord2f(0, 0)
• glVertex3f(t x, -t, t y)
• glTexCoord2f(0, 1)
• glVertex3f(t x t, -t, t y)
• glTexCoord2f(1, 1)
• glVertex3f(t x t, -t, t y t)
• glTexCoord2f(1, 0)
• glVertex3f(t x, -t, t y t)
• glEnd()

8
System Structure and Design

• Level Design
• 2D arrays of data
• A integer key describing tile types
• 0 Empty
• 1, 3, 5 Individual Wall Types
• 2, 4, 6 Individual Floor Types
• 7 Tree
• 8 Pit
• 9 Special Floor

9
Level Array Sample Code

• int roomSix1515
• 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
• 0,0,0,0,0,3,3,3,3,3,0,0,0,0,0, 0,0,0,0,3,3,4,
  4,4,3,3,0,0,0,0, 0,0,0,3,3,4,4,4,4,4,3,3,0,0,0
  , 0,0,3,3,4,4,4,4,4,4,4,3,3,0,0, 0,3,3,4,4
  ,4,3,4,3,4,4,4,3,3,0, 0,3,4,4,4,3,3,4,3,3,4,4,
  4,3,0, 0,3,4,4,4,3,4,4,4,3,4,4,4,3,0, 0,3,
  4,4,4,3,4,4,4,3,4,4,4,3,0, 0,3,3,4,4,3,3,3,3,3
  ,4,4,3,3,0, 0,0,3,3,4,4,4,4,4,4,4,3,3,0,0,
  0,0,0,3,3,4,4,4,4,4,3,3,0,0,0, 0,0,0,0,3,3,4,
  4,4,3,3,0,0,0,0, 0,0,0,0,0,3,3,3,3,3,0,0,0,0,0
  , 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0

10
Level Array Sample
11
System Structure and Design

• Game Scripting
• Overview of scripting
• Very verbose and tedious!
• Player Scripting
• Keep track of player coordinates
• and direction
• Item and tile collision
• Switching between rooms in a level
• Item Scripting
• Assigning certain tasks to items
• Pop-up dialogue boxes
• Very verbose and tedious

12
Item Scripting Sample Code

• if(door.isItemInRoom())
• if(isItemInWay(door, pX, pY, pDir)
  avatar.getHasBronzeKey())
• door.setItemInRoom(false)
• door.setItemUsed(true)
• bronzeKey.setItemInInventory(false)
• bronzeKey.setItemUsed(true)
• theInterface.setLeftTexture(leftInterfaceTex)
• avatar.setHasBronzeKey(false)
• //Load pop-up Door is unlocked
• else if(isItemInWay(door, pX, pY, pDir))
• //Load pop-up Door is locked

13
System Features

• Texture Mapping The process of superimposing a
  2D texture or pattern over the surface of a 3D
  graphical object. This is an efficient method for
  producing the appearance of texture, such as that
  of wood or stone, on a large surface area.

14
System Features
Items placed throughout the games environment
add variety and interactivity.

• 3D Items
• Multiple planes in 3D space
• Doors, stairs, characters
• 2D Items
• Placed over a flat floor tile
• Textured to look like a 3D object
• Levers, keys

15
System Features

• Level Design
• Using tile types to create a
• variety of environments
• Levels have unique time themes
• Level Puzzles
• Interacting with other characters
• Using objects to accomplish goals
• Navigating complex terrain

16
Problems Encountered

• Creating class structure
• Setting up OpenGL 3D space
• Enabling texture-mapping
• Running out of texture memory
• Time constraints
• Prevented us from adding audio and additional
  levels (especially bigger, better, and more
  challenging ones)

17
Project Demonstration