v0.2

Added features:

• Triangle meshes and basic support for OBJ files
• Area Lights
• Saving and loading PNG files
• Quadrics: Cylinder, cone, paraboloid
• Abstract Integrator type
• New integrators: DebugIntegrator for rendering albedo/normal/depth and DirectLighting

v0.1

Features:

• Path tracing
• Russian Roulette
• Two materials: Diffuse (Lambert's BRDF) and Mirror
• Pinhole and thin lens cameras
• Gradient-base environment lighting
• Directional and Point lights
• Importance Sampling BRDFs
• Antialiasing
• Multithreading
• Textures (including procedurally generated checkerboard)
• Supported objects: Plane, Sphere, Rectangle