Added

• Light tree for hierarchical NEE and direct intersections
• PMJ sampling
• Ray type visibility masks (diffuse, glossy etc.)
• Gauss and Blackman-Harris image filters
• Multithreaded interface for scene Finalize
• Texture compression for CPU backends
• Direct loading of BC-compressed images
• TSAN tests on CI
• Path-space regularization
• Option to flip normalmap Y channel (DirectX convention)
• Ability to create single-sided mesh lights
• Physical sky sample
• Build version string

Fixed

• Indirect clamp not affecting unshadowed lights
• Clamping not preserving color hue
• Glossy material desaturation an glazing angles
• Flipped front/back materials on GPU
• Not implemented RemoveMeshInstance, RemoveLight, RemoveMesh
• Incorrect scaled mesh lights intensity
• Incorrect mix node resolution in SIMD mode
• Incorrect NEE for textured triangle lights
• Incorrect MIS at the last bounce
• Incorrect far clip plane
• Incorrect transmission below 1.0
• Incorrect pitch black values with filmic tonemap
• Incorrect clamping of direct light intersections
• Triangular artifacts on AMD
• Crash on out of memory fallback to CPU RAM
• Fireflies with some HDRI images
• Flipped tangent basis on flipped UV islands
• Crash on hitting transparency limit (CPU only)
• Broken DOF RNG (GPU only)
• Incorrect alpha of 0.8 in samples
• Meshlights triangles memory leak
• Adreno issues with new driver
• Non-reproduceable GPU test runs

Changed

• Improved physical sky (multiple scattering, clouds, moon, stars)
• Improved area light sampling
• Improved adaptive sampling
• BC4/BC5 compression uses SSE acceleration
• Texture compression uses NEON acceleration
• AUX buffers output is enabled permanently
• Bundled GPU shaders compressed using deflate
• More flexible interface for specifying vertex attributes
• Sphere light is allowed to have zero radius
• Bounded sampling is used for VNDF
• Mix node texture is allowed to be SRGB
• HWRT BLAS build happens per mesh instead of all at once
• 15-seconds time limit is used for README images

Removed

• LinearAlloc
• Tent image filter