Physically-Based Rendering

A short course on pathtracing for Stamatics Projects '21.

Week 7

The path-based formulation has been implemented, with paths being built incrementally. Sampling is now over a hemisphere since we're not really doing transparency right now, every material now has its own BRDF.

Task: Stratified sampling for the camera

The current implementation samples camera rays uniformly from a circlular region inside the active pixel. Implement stratified sampling which subdivides this pixel and selects samples uniformly within those subdivisions.

Result

These images were generated with 4 bounces and samples-per-pixel 16, 128, 512 and 1024 respectively. These results were with no stratified sampling.

Build Instructions

Requirements:

• C++ compiler
• CMake (get this via pip and not apt if you're on Ubuntu)

Build:

mkdir build
cd build
cmake ..
cmake --build .

You should now have an executable in build/bin or build/bin/Debug