volppm

Volumetric progressive photon mapping written in C++.

WIP.

Features

• Homogeneous medium
• Hero wavelength sampling for chromatic absorption/scattering coefficient
• Artist friendly parameter to control absorption/scattering coefficient
• Random walk subsurface scattering
• Load obj model

Requirements

• C++ (20>=)
• CMake (3.20>=)
• OpenMP
• spdlog
• Embree (>=3)

Build

|CMake option|Description| |:--|:--| |BUILD_TESTS|build tests|

git submodule update --init
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release ..
make

Gallery

Water cornell box

|Parameter|Value| |:--|:--| |number of iterations|1000| |number of photons in each iteration|200000| |alpha|3/4| |initial search radius for surface|0.01| |initial search radius for volume|0.05|

This model is available at models/CornellBox-Water-Small-Light-Covered-Cube-Floor-No-Backwall.obj

References

• Physically Based Rendering:From Theory To Implementation, Matt Pharr, Wenzel Jakob, and Greg Humphreys
• Efficient simulation of light transport in scenes with participating media using photon maps
• Hachisuka, Toshiya, Shinji Ogaki, and Henrik Wann Jensen. "Progressive photon mapping." ACM SIGGRAPH Asia 2008 papers. 2008. 1-8.
• Hachisuka, Toshiya, and Henrik Wann Jensen. "Stochastic progressive photon mapping." ACM SIGGRAPH Asia 2009 papers. 2009. 1-8.
• Knaus, Claude, and Matthias Zwicker. "Progressive photon mapping: A probabilistic approach." ACM Transactions on Graphics (TOG) 30.3 (2011): 1-13.
• Wilkie, Alexander, et al. "Hero wavelength spectral sampling." Computer Graphics Forum. Vol. 33. No. 4. 2014.
• Chiang, Matt Jen-Yuan, Peter Kutz, and Brent Burley. "Practical and controllable subsurface scattering for production path tracing." ACM SIGGRAPH 2016 Talks (2016): 1-2.
• Fong, Julian, et al. "Production volume rendering: Siggraph 2017 course." ACM SIGGRAPH 2017 Courses. 2017. 1-79.
• Wrenninge, Magnus, Ryusuke Villemin, and Christophe Hery. Path traced subsurface scattering using anisotropic phase functions and non-exponential free flights. Tech. Rep. 17-07, Pixar. https://graphics. pixar. com/library/PathTracedSubsurface, 2017.
• Novák, Jan, et al. "Monte Carlo methods for volumetric light transport simulation." Computer Graphics Forum. Vol. 37. No. 2. 2018.