Raytracer

A CPU raytracer built with C++20, featuring physically-based rendering with Cook-Torrance materials, soft shadows via area lights, and BVH acceleration.

Table of Contents

• Screenshots
• Features
• Controls
• Building

Screenshots

Cook-Torrance BRDF

Soft Shadows (Area Light)

BVH Debug Views

Features

• Whitted-style ray tracing on the CPU
• Parallel rendering with std::execution::par_unseq
• Cook-Torrance BRDF (GGX distribution, Smith geometry, Fresnel-Schlick)
• Lambert and Lambert-Phong shading models
• Soft shadows with area lights (triangular)
• Progressive rendering with per-frame accumulation
• Anti-aliasing: random and uniform multi-sampling
• Triangle mesh rendering with OBJ loading
• Bounding Volume Hierarchy (BVH) acceleration
• AABB slab test for ray-box intersection
• Multiple debug visualization modes: observed area, radiance, BRDF, combined
• Tone mapping (Reinhard Jodie, ACES approximation)
• Custom math library (vectors, matrices)

Controls

Camera
WASD: Move
LMB + drag: Rotate

Settings
X: Screenshot
F2: Toggle shadows
F3: Cycle light mode (observed area / radiance / BRDF / combined)
F4: Cycle sample mode (random / uniform)
F5: Decrease samples per frame
F6: Increase samples per frame
F7: Cycle tone mapping (none / Reinhard Jodie / ACES)
F8: Toggle progressive rendering
F9: Toggle BVH acceleration
F10: Cycle BVH debug (off / leaf colors / AABB wireframe)

Scenes
1-9: Switch scene

Building

The project uses CMake.

cmake -S . -B build
cmake --build build