minimal but extensible header only implementation of photon mapping in C++

yumcyawiz

Last update: Dec 21, 2022

Overview

photon_mapping

minimal but extensible header only implementation of photon mapping in C++.

Features

Direct illumination with explicit light sampling
Indirect illumination with final gathering
Caustics photon map
Reference path tracing integrator
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

Run

place obj model under build and run

./examples/main

Structure

Name	Description
`include/camera.h`	ray generation from camera
`include/core.h`	basic data types
`include/image.h`	image
`include/integrator.h`	implementation of photon mapping, path tracing(for reference)
`include/light.h`	light
`include/material.h`	implementation of BRDF, BTDFs
`include/photon_map.h`	implementation of photon map with kdtree
`include/primitive.h`	primitive
`include/sampler.h`	random number generation, sampling utilities
`include/scene.h`	ray-scene intersection, model loading
`include/triangle.h`	point sampling on a triangle

Gallery

Cornell box without final gathering

Parameter	Value
number of photons	1000000
number of nearest neighbors	100
number of samples	100
final gathering	false

Cornell box with final gathering

Parameter	Value
number of photons	1000000
number of nearest neighbors	100
number of samples	100
final gathering	true

Cornell box with mirror spheres

Parameter	Value
number of photons	1000000
number of nearest neighbors	100
number of photons for caustics photon map	1000000
number of samples	100

Cornell box with water

Parameter	Value
number of photons	100000
number of nearest neighbors	100
number of photons for caustics photon map	10000000
number of samples	256

This model is available under models/

Externals

References

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