Notes for Homework 9

• For this assignment, you may either write your own ray tracer from scratch or use a basic C++ ray tracing infrastructure that I have created.
• If you write your own code:
  • You must include in your README how to recreate the sample scene (see below) with your program.
  • Your output image should be 512 x 512.
  • You may use the code to read and write PPM and BMP files from here.
  • You may wish to look at the homework #9 from 2005 for a few hints on how to structure your code.
  • You may selectively use parts of my ray tracing framework.
• If you wish to use my framework:
  • On Linux, grab this [tar.gz] file.
    • Once you have completed the code, you should be able to type "make" to compile.
  • On Windows, grab this [zip] file.
    • Included is a Visual Studio.NET 2003 project (which should work in VS 2005, too).
    • The framework uses GLUT (to display), so you need to have that installed.
  • You should read through the code (at least the .h files) so you understand them.
  • You need to write the following methods in order to complete/compile the code:
    • In Camera.cpp: Camera::Camera()
    • In Camera.cpp: Camera::GenerateRay()
    • In InfinitePlane.cpp: InfinitePlane::Intersect()
    • In InfinitePlane.cpp: InfinitePlane::ComputeNormal()
    • In LambertianMaterial.cpp: LambertianMaterial::Shade()
    • In Sphere.cpp: Sphere::Intersect()
    • In Sphere.cpp: Sphere::ComputeNormal()
  • I have created a function SetupHomework9Scene() in SetupScene.cpp that creates a Scene object describing the required scene for you.
• You scene should draw the following REQUIRED scene:
  • Eye at: (0,5,5), Looking at: (0,0,0), with Up Vector: (0,1,0).
  • Field of view in the Y-axis should be 60 degrees.
  • Red (1,0,0) sphere centered at (0,1,0) with radius 1
  • Green (0,1,0) sphere centered at (3,1,-3) with radius 3
  • Yellow (1,1,0) sphere centered at (-2,-3,2) with radius 2
  • Blue (0,0,1) plane with normal (0,1,0) running through point (0,-2,0)
  • Yellow (1,1,0) plane with normal (0,0,1) running through point (0,0,-7)
  • Light at: (-5,5,2) with color (1, 0.6, 1)
  • Here's an example result at 400 x 400.
• You may download an example executable:
  • Linux (runs on MLH 301 lab machines)
  • Windows (requires a copy of glut32.dll)
• Please update your web page with images of the sample scene, as well as a couple other scenes you've created.

Chris Wyman (cwyman@cs.uiowa.edu)