Physics-Based Rendering - Ray Tracer

A physics-based renderer, including support for a variety of rendering algorithms, materials, illumination sources, and sensors. The final project explore fur rendering.

Paper references:

1. Ling-Qi Yan, Henrik Wann Jensen, and Ravi Ramamoorthi. 2017. An Efficient and Practical Near and Far Field Fur Reflectance Model. ACM Transactions on Graphics (Proceedings of SIGGRAPH 2017) 36, 4 (2017).
2. Ling-Qi Yan, Weilun Sun, Henrik Wann Jensen, and Ravi Ramamoorthi. 2017. A BSSRDF Model for Efficient Rendering of Fur with Global Illumination. ACM Transactions on Graphics (Proceedings of SIGGRAPH Asia 2017) 36, 6 (2017).

High Level Overview

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The Dirt repository contains source code that are a part of the actual ray tracer as well as other external libraries that dirt depends upon.

The external dependencies are located within the ext subdirectory, and include:

• filesystem - for manipulating paths on Linux/Windows/Mac OS
• json - for handling json input file formats of scenes
• stb_image - for loading and storing images
• tinyformat - pretty formatting and printing of strings
• pcg32 - a small, self-contained cross-platform random number generator

The major components of the dirt can be split into the following.

• Utility
  • argparse.h - class to help parse command-line arguments
  • common.h - utility code used throughout dirt.
  • image.h - manipulates image data.
  • obj.h - loading geometry data from OBJ files.
  • parser.h - parse dirt scenes and data structuresa from a JSON file.
  • progress.h - manage/print a progress bar on the command-line
  • timer.h -
• Math
  • transform.h - contains code that implements 3-D transformations.
  • vec.h - functionality related to N-D vectors (including colors), 4x4 matrices, rays, and axis-aligned bounding boxes
• Raytracing
  • camera.h - contains the camera class that represents the virtual camera placed inside a scene.
  • material.h - contains the material class that determines the shaded color of an object.
  • surface.h - contains the base surface class that represents any geometry within the scene.
  • surfacegroup.h - contains the base class for aggregate/grouped geometry (an acceleration structure)
  • scene.h - contains the scene class that stores all geometry, materials and camera.
  • testscenes.cpp - a few hard-coded scenes

Building Instructions

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Building from the command-line generally looks like this:

mkdir build
cd build
cmake ..
cmake --build . -j 4

More detailed instructions for building dirt are provided in the course website.

License Information

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Check the LICENSE file