Project Proposal: GPU Raytracer Reimplementation

Team: Conrad Kreyling, Michael Ey
Class: 4003-571 (Computer Graphics II Undergraduate)
Professor: Warren C. Carithers

Scene to be created: A reconstruction of the Turner Whitted image used in the raytracer project, with emphasis on real-time rendering. This will sit in the Pixel pipeline on the GPU, but ultimately is a pipeline reimplementation.

Project Objectives:

• Implementation of a raytracer entirely on the GPU
• Attempt to achieve interactive frame rates
• Attempt to implement photon mapping (at least caustics)

Software Used:

• Microsoft's XNA2.0 Game Development Library (C#)
• Microsoft's High-Level Shader Language (HLSL) Implementation
• Microsoft Windows

Hardware Used:

• x86 Architecture
• DirectX 9.0c Compatible GPU
• XBox 360
  

Project Components:

• Small wrapper UI, quite possibly taken line for line from the raytracer project
• A packed scene descriptor language able to be transfered to the card in a 1D texture
• HLSL view plane generation algorithm
• HLSL implementation of ray intersection tests

Project Responsibilities: Mike and I have worked on several projects in the past, and have become very accustomed to a organic development process. As such, neither of us have a preset list of responsibilities, but will work closely to ensure the project's completion.

Milestones:

• By April 17th we intend to be developing a "Checkpoint 2" image. This covers:
• Generation of scene descriptor language
  
• Ray intersection tests
• View plane generation
• By April 25th we intend to have the Turner Whitted image rendered fully, with recursive raytracing
  
• By May 17 we intend to have optimized the recursive raytracing algorithm to interactive levels (around 15 fps). We also intend to have Photon Mapping implemented, and an image demonstrating this feature.

Presentation:

• We will provide a short PowerPoint-backed presentation briefly describing our project, and the technologies used
  
• With any luck, we will be able to provide a live demo with an Xbox360 unit
• Failing that, we will provide a live demo with a laptop :(
  

Checkpoint 2: I Am A Professional Designer

The above image took Mike and me over 3 hours to render in MS Paint. We feel our work speaks for itself.


Furthermore, Mike was able to apply the "Motion Blur" filter in Photoshop to create the above image. He is truly a genius with computing technology.

In conclusion: Checkpoint 2 is done! Basic non-recursive raytracing is implemented as well as supersampling.

Checkpoint 1

Conrad and I sat down and got the initial checkpoint done, using XNA. The paramaters of the scene are as follows:

Camera:
Position: x = 0.0, y = 0.0, z = 0.0
Look At: x = 0.0, y = 0.0, z = -1.0
Up: x = 0.0, y = 1.0, z = 0.0
Field Of View: 90.0 degrees
Near Clip: 1.0
Far Clip: 1000.0
Aspect Ratio: 4.0/3.0

Light:
Position: x = 1.2, y = 9.0, z = 5.0
Specular and Diffuse colors are both full white

Green Sphere:
Position: x = 0.3, y = 0.3, z = -3.4
Radius: 1.5

Yellow Sphere:
Position: x = -2.3, y = -0.8, z = -5.0
Radius: 1.5

Plane:
Position: x = -2.0, y = -2.0, z = 0.0
Width = 10.0
Length = 50.0