appleseed vs RenderMan

appleseed is a free, open source rendering engine for animation and visual effects, built around physically based global illumination. It is designed for individuals and small studios and runs on Windows, Linux, and macOS. Rendering methods include unidirectional path tracing, stochastic progressive photon mapping, light tracing, progressive and interactive rendering, and spectral rendering. For shading, it supports Open Shading Language and on-the-fly shader compilation. Production tools include motion blur, AOVs, Cryptomatte, adaptive sampling, denoising, and resumable render checkpoints. Native integrations are listed for Autodesk Maya, Autodesk 3ds Max, Blender, and Gaffer. It works with OBJ geometry and image formats including OpenEXR, TIFF, HDR, PNG, JPEG, and PSD. Developers can use C++ and Python APIs or extend the engine with external C++ plugins. The listed plan costs nothing and is under the MIT license. The download page lists version 2.1.0-beta, released September 21, 2019.

RenderMan is Pixar’s production rendering software for visual effects and animation, available for Linux, macOS, and Windows. Its physically based tools include multi-bounce ray-traced global illumination and ray-traced subsurface scattering. RenderMan 27 adds XPU, a hybrid CPU/GPU renderer with multi-GPU support, and a machine-learning denoiser developed with Disney Research and trained on Disney and Pixar data. The Stylized Looks toolset supports approaches such as illustration and anime. Bridge tools connect it with Maya, Houdini, Solaris, Katana, and Blender, while supported standards include Alembic, OpenColorIO, OpenEXR, OpenVDB, OSL, and USD.

RenderMan requires an AVX-capable processor. XPU and the OptiX denoiser also need an Nvidia Pascal-or-newer GPU; XPU requires at least 12 GB of VRAM. Non-commercial use is free but limited to the latest version and excludes Stylized Looks. Commercial licenses are $595 per licence once; maintenance is $250 a year.