Ray Tracer

A minimal GPU accelerated ray tracer written in OpenGL.

10k Samples / 813 Seconds

Features:

• Next event estimation
• GGX microfacet model for variable roughness
• Sampling of visible normal distribution function
• Progressive rendering
• BVH acceleration

Screenshots

Left: Normals, Middle: Diffuse, Right: Quality vs Samples

Requirements

• CMake
• GPU with OpenGL (>= 4.6) support
• GLFW (already included)
• GLAD (aldreay included)
• STB (already included)

Build

mkdir build
cd build
cmake ..
make

Usage

raytracer <NUM_SAMPLES> <IMAGE_SIZE> <IMAGE_PATH>

TODO:

• SVGF denoising
• Transmissive materials (glass, water etc.)
• Allow importing OBJ files
• Bidirectional path tracing
• Move to Vulkan and use hardware ray tracing acceleration

Known Issues

• There are some ringing artifacts on the left Cuboid and the Sphere (see diffuse.png).
• Using BVH is actually slower than not using it (11s vs 8s for 100 samples).