CSE 381 – Advanced Game Programming Code Setup

Fix the Working Directory [ERROR] Failed to initialize the resource cac he! Are your paths set up correctly? Function: GameCodeApp::InitInstance \psf\home\desktop\gamecode4\source\gcc\gam ecode4\gamecode.cpp Line: 178 Solution: Right-click on the TeapotWars project and go to properties. Then go to the Debugging section and enter in..\..\..\Game as the Working Directory.

Game Programmers 30 Years Ago Used to do everything design art code

Today’s Game Programmer Typically Specialized Character movements programmer Network communications programmer Web programmer …

Why is that important?

Oh by the way Version Control is not just for Code Assets too Don’t lose a model an artist spent weeks on

Paraphrasing Richard Garriott (a.k.a Lord British) The game industry is a lot like the movie industry BUT At the beginning of every game project we start by inventing new cameras, film, and processing techniques, and projectors.

SDKs Pros & Cons Pros: Speed Up Development Flexible Well Tested (hopefully) Can be powerful But, might:: Be inflexible for your purposes Have difficult to find bugs Have big differences between versions

Game Engine SDKs with Tools For Building game merging & optimizing assets organizing content Adding triggers, dynamic object generators, bots, etc. Level geometry/terrain likely built elsewhere i.e. Maya

Unity Scene Editor

Lots of them Out There

For Next Wednesday Read Chapters 2-5 (that’s 125 pages or so) Download & Install Blender3D do Noob to Pro Tutorial Units 1-2B I’ll check next Wed. to make sure everyone completed the Simple Person with a Hat

Why Blender3D? It can make great content It's widely used It's free

Download & Install Latest version 2.68a

Blender 3D: Noob to Pro

What can blender do? Create 3D content Create 3D worlds Produce realistic, beautiful, fantastic 2D projected renderings of 3D content/worlds

First, some formal definitions What's a 3D model? –an abstract version of an object –renderable –data (vertices, edges, textures, etc.) What's modeling? –Process of making 3D models

Model Data Vertices Edges Faces Surface Normals

Steps in the Modeling Process Object modeling Shading Lighting Rigging Posing

Shading includes Texturing Wrapping 3D geometry in images Atlas and Model

Polygon Mesh Creation Example

3D World Construction & Rendering Based on Geometry Imagine a model of this room Everything needs a position in 3D space –think 3D coordinates (x, y, z) –Where's the origin (0,0,0) of our room?

Blender3D Axes X, Y, Z –Cartesian Coordinates –Are negative coordinates ok? Right-handed System, Huh?

Axes of Rotation We'll want to rotate stuff How do we denote a rotation? We need 2 things: –Axis of rotation –Angle around axis Right-grip rule

Coordinate Transformations Changes an object's coordinate values in some way –Moving an object (translation) –Rotating an object (rotation) –Enlarging or shrinking an object (scaling)

Translation, Rotation, & Scaling

Multiple Transformations They can be combined on an object Order of processing matters

Projections Our 3D worlds are projected onto 2D screens –Orthographic vs. Perspective projection Orthographic Perspective

Orthographic views can be useful. Why?

Perspective Projection uses Foreshortening What's that? –nearby objects rendered larger than faraway objects –gives the illusion of depth and distance

What's a vanishing point? Imagine looking down a set of train tracks They appear to converge at a point on the horizon This is the vanishing point

The Projection Plane Depends on camera position and orientation

Blender Coordinates Global Coordinate System –each scene has its own –fixed origin & orientation –virtual camera may be moved about Local Coordinate System –each object has its own