# 3.0 - 3.6 Release Notes

- Release 3.6
  - Release 3.6.1 - June 2025
  - Release 3.6.0 - Sep 2023
- Release 3.5
  - Release 3.5.1 - July 2023
  - Release 3.5.0 - Sep 2022
- Release 3.4
  - Release 3.4.4 - Feb 2021
  - Release 3.4.3 - Apr 2020
  - Release 3.4.0 - Jun 2019
- Release 3.3
  - Release 3.3.3 - Jul 2018
  - Release 3.3.2 - Jun 2018
  - Release 3.3.1 - Feb 1018
  - Release 3.3.0 - Aug 2017
- Release 3.2
  - Release 3.2.0 - Feb 2017
- Release 3.1
  - Release 3.1.1 - Jan 2017
  - Release 3.1.0 - Oct 2016
- Release 3.0
  - Release 3.0.5 - Mar 2016
  - Release 3.0.4 - Feb 2016
  - Release 3.0.3 - Oct 2015
  - Release 3.0.2 - Aug 2015
  - Release 3.0.1 - Aug 2015
  - Release 3.0.0 - Jun 2015
  - Release 3.0.0 RC2
  - Release 3.0.0 RC1
- Previous 2.x Release Notes

### Release 3.6

#### Release 3.6.1 - June 2025

Release 3.6.1 is a minor release including bug fixes and configuration improvements.

Changes
  - Updated CMake minimum version to 3.14 (GitHub #1349)
  - Updated documentation regarding external dependencies (GitHub #1346 #1360)
  - Updated API and example documentation (GitHub #1351 #1362)
  - Updated build_osd.py visual studio discovery and dependent package versions (GitHub #1333 #1354 #1361)
  - Updated azure pipelines agents (GitHub #1337 #1342 #1355 #1361)
  - Updated use of OpenCL in example viewers (GitHub #1357)
  - Addressed Clang 16 compiler warnings (GitHub #1356)
  - Addressed some address sanitizer build warnings (GitHub #1343)
  - Added configuration options to build Osd patch shader source independent of other Osd dependencies (GitHub #1359 #1363)
Bug Fixes
  - Fixed evaluation of surface patches at valence-2 darts (GitHub #1336)
  - Fixed sharpening of vertices on potential non-manifold creases (GitHub #1338)
  - Fixed sharing of Bfr::Surface topology with valence-2 interior vertices (GitHub #1353)

#### Release 3.6.0 - Sep 2023

Release 3.6.0 is a significant release with new features, several configuration improvements, and bug fixes. For more information on the following, see Release 3.6

Changes
  - Updated Osd patch drawing shader source to exclude legacy shader constructs to improve compatibility with Vulkan, DX12, etc. (GitHub #1320)
  - Installed Osd patch evaluation headers to allow use from client shaders and compute kernels (GitHub #1321)
  - Updated CMake build to locate TBB using TBB's CMake config in order to support oneTBB (GitHub #1319)
  - Updated CMake FindOpenCL module to support parsing version information from recent OpenCL headers (GitHub #1322)
  - Removed obsolete .travis.yml (GitHub #1324)
Bug Fixes
  - Fixed inconsistent warning levels for MSVC builds when using Ninja (GitHub #1318)
  - Fixed documentation build errors when using Ninja (GitHub #1323)
  - Fixed build errors resulting from oneTBB API changes (GitHub #1317)

### Release 3.5

#### Release 3.5.1 - July 2023

Release 3.5.1 is a minor release including bug fixes and configuration improvements.

Changes
  - Updated CMake to set fallback CMAKE_CXX_STANDARD to C++14 (GitHub #1276)
  - Updated CMake with OpenGL import targets to avoid link errors (GitHub #1277)
  - Updated CMake to set gpu architecture fallback only for older CUDA versions (GitHub #965 #1299)
  - Updated CMake to use append for CMAKE_MODULE_PATH (GitHub #1296)
  - Fixed interface includes for CMake config (GitHub #1278)
  - Fixed warnings with newer and stricter use of Clang (GitHub #1275 #1289 #1290)
  - Fixed potential float constant cast errors for OpenCL (GitHub #1285)
  - Fixed generation of Apple Frameworks with no OSD_GPU targets enabled (GitHub #1224 #1236)
Bug Fixes
  - Fixed Bfr::Surface construction bug for rare topological case (GitHub #1301)
  - Fixed CUDA example dependencies with GLX on Linux (GitHub #1294)

#### Release 3.5.0 - Sep 2022

Release 3.5.0 is a significant release with new features, several configuration improvements, and a few other improvements and bug fixes. For more information on the following, see Release 3.5

Deprecation Announcements
  - Hbr is deprecated and will be removed from subsequent releases
New Features
  - Simplified Surface Evaluation (Bfr)
  - Tessellation Patterns (Bfr)
Changes
  - Suppression of GCC compiler warnings (GitHub #1253, #1254, #1270)
  - Additional methods for Far::TopologyLevel (GitHub #1227, #1255)
  - Improved mixed partial derivative at Gregory patch corners (GitHub #1252)
  - Minor improvements to Far tutorials (GitHub #1226, #1241)
  - Added CMake config (GitHub #1242)
  - Updated CMake minimum version to 3.12 (GitHub #1237, #1261)
  - Updated documentation build scripts for Python 3 (#1265, #1266)
  - Updated 'stringify' build tool for improved cross compilation support (GitHub #1267)
  - Added 'NO_MACOS_FRAMEWORKS' build option (GitHub #1238)
  - Updated Azure pipelines agents for Unbuntu and macOS (GitHub #1247, #1256)
  - Removed obsolete AppVeyor and Travis CI scripts (GitHub #1259)
Bug Fixes
  - Cache active program for Osd::GLComputeEvaluator (GitHub #1244)
  - Fixed member initialization warnings in Osd::D3D11ComputeEvaluator (GitHub #1239)
  - Fixed GLSL shader source to remove storage qualifiers from struct members (GitHub #1271)
  - Fixed use of CMake variables for Apple builds (GitHub #1235)
  - Fixed build errors when using OpenGL without GLFW (GitHub #1257)
  - Fixed links to embedded videos (GitHub #1231)

### Release 3.4

#### Release 3.4.4 - Feb 2021

Release 3.4.4 is a minor release including bug fixes and configuration improvements

Changes
  - The "master" branch on GitHub has been renamed "release" (GitHub #1218 #1219)
  - The CMake configuration has been updated to allow use as a sub-project (GitHub #1206)
  - Removed obsolete references to hbr from examples/farViewer (GitHub #1217)
Bug Fixes
  - Fixed bug with sparse PatchTables and irregular face-varying seams (GitHub #1203)
  - Fixed loss of precision when using double precision stencil tables (GitHub #1207)
  - Fixed reset of Far::TopologyRefiner::GetMaxLevel() after call to Unrefine() (GitHub #1208)
  - Fixed linking with -ldl on unix systems (GitHub #1196)
  - Fixed naming and installation of macOS frameworks (GitHub #1194 #1201)
  - Fixed GL version and extension processing and dynamic loading on macOS (GitHub #1216)
  - Fixed FindDocutils.cmake to be more robust (GitHub #1213 #1220)
  - Fixed errors using build_scripts/build_osd.py with Python3 (GitHub #1206)

#### Release 3.4.3 - Apr 2020

Release 3.4.3 is a minor release including bug fixes and configuration improvements

Changes
  - GLEW is no longer required by default (GitHub #1183 #1184)
  - Removed false Ptex link dependency from libosdCPU (GitHub #1174)
  - Removed false GLFW link dependency from DX11 and Metal examples (GitHub #1178)
  - Removed link dependency on unused TBB libraries (GitHub #1064)
  - Added option to disable building of dynamic shared libraries (GitHub #1169)
  - Added new tutorial for Far::LimitStencilTable (GitHub #1176)
  - Updated use of EXT_direct_state_access to ARB_direct_state_access (GitHub #1184)
  - Fixed C++ strict aliasing warnings (GitHub #1182)
  - Fixed MSVC warnings in example code (GitHub #1158 #1172)
  - Fixed compatibility with Visual Studio 2019 (GitHub #1173 #1189)
  - Fixed CMake CMP0054 warnings (GitHub #1180)
  - Added prefix to OpenSubdiv CMake macros (GitHub #1157)
  - Moved utilities in examples/common to regression/common (GitHub #1167)
  - Minor fixes to Far tutorials (GitHub #1175 #1177)
  - Switched to Azure Pipelines for continuous integration testing instead of Travis-CI and AppVeyor (GitHub #1168 #1190)
Bug Fixes
  - Fixed selective boundary interpolation for case Sdc::Options::VTX_BOUNDARY_NONE (GitHub #1170 #1171)
  - Fixed static library linking to address missing symbols (GitHub #1192)
  - Additional fixes for dynamic and static linking (GitHub #1193)

#### Release 3.4.0 - Jun 2019

Release 3.4.0 is a significant release with several new features, bug fixes, and general code and configuration improvements. For more information on the following, please see Release 3.4

New Features
  - Triangular Patches for Loop subdivision
  - Improvements to Introductory Documentation
  - Sparse Patch Tables and Adaptive Refinement
  - Full Support for Double Precision in Far
Changes
  - Added new build script (GitHub #1068)
  - Added support for newer DirectX SDKs (GitHub #1066)
  - Patch arrays extended to support combined regular and irregular types (GitHub #995)
  - Far::PatchTables and adaptive refinement supported for Bilinear scheme (GitHub #1035)
  - New Far::PatchTableFactory method to determine adaptive refinement options ((GitHub #1047)
  - New Far::PatchTableFactory options to align primvar buffers of uniform tables (GitHub #986)
  - Far::StencilTable::UpdateValues() overloaded to support separate base buffer (GitHub #1011)
  - Far::LimitStencilTableFactory updated to create face-varying tables (GitHub #1012)
  - Regular patches on boundaries no longer require additional isolation (GitHub #1025)
  - Inclusion of OpenSubdiv header files in source code now consistent (GitHub #767)
  - Re-organization of and additions to Far tutorials (GitHub #1083)
  - examples now use common command-line conventions and parsing (GitHub #1056)
Bug Fixes
  - Fixed Far::PrimvarRefiner internal limitFVar() prototype (GitHub #979)
  - Fixed Far::StencilTable append when base StencilTable empty (GitHub #982)
  - Patches around non-manifold vertices now free of cracks (GitHub #1013)

### Release 3.3

#### Release 3.3.3 - Jul 2018

Release 3.3.3 is bug-fix release addressing regressions from release 3.3.2

Bug Fixes
  - Fixed a regression in PatchTable construction with varying patches (GitHub #976)
  - Fixed a regression in PatchTable construction for face-varying patches (GitHub #972)
  - Fixed a bug in the initialization of Far::SourcePatch (GitHub #971)

#### Release 3.3.2 - Jun 2018

Release 3.3.2 is a minor release with potentially significant performance improvements to the patch pre-processing stages

Changes
  - Improved performance of PatchTable construction (GitHub #966)
  - The resulting improved accuracy will produce slight numerical differences in computations involving patches, e.g. StencilTable and PatchTable evaluation
Bug Fixes
  - Far::PatchTableFactory now supports PatchTable construction with ENDCAP_BILINEAR_BASIS specified

#### Release 3.3.1 - Feb 1018

Release 3.3.1 is a minor bug-fix release

Bug Fixes
  - Fixed GLSL/HLSL/Metal patch shader code to resolve degenerate normals (GitHub #947)
  - Fixed problems with face-varying patches in uniform PatchTables (GitHub #946)
  - Fixed integer overflow bugs for large meshes in PatchTable factories (GitHub #957)
  - Fixed computation of PatchParam for triangle refinement (GitHub #962)
Changes
  - Added build options: NO_GLFW and NO_GLFW_X11
  - Added additional shapes with infinitely sharp creases to the Metal and DX11 example viewers
  - Disabled GL tests during CI runs on Linux
  - Improved stability of examples/glImaging in CI runs by testing GL version

#### Release 3.3.0 - Aug 2017

Release 3.3.0 is significant release adding an Osd implementation for Apple's Metal API

New Features
  - Added an Osd implementation for Apple's Metal API
  - Added the mtlViewer example
Changes
  - Fixed several instances of local variable shadowing that could cause build warnings
  - Updated continuous-integration build scripts and added testing on macOS

### Release 3.2

#### Release 3.2.0 - Feb 2017

Release 3.2.0 is a minor release containing API additions and bug fixes

New Features
  - Extended Far::StencilTableFactory to support face-varying
  - Extended Osd Evaluator classes to support evaluation of 1st and 2nd derivatives
  - Added an option to disable generation of legacy sharp corner patches
Changes
  - Corrected numerous spelling errors in doxygen comments
  - Updated glFVarViewer with improved error detection and command line parsing
  - Added option to build using MSVC with static CRT
Bug Fixes
  - Fixed a double delete of GL program in Osd::GLComputeEvaluator

### Release 3.1

#### Release 3.1.1 - Jan 2017

Release 3.1.1 is a minor bug-fix release.

Bug Fixes
  - Fixed a bug with non-manifold face-varying topology causing a crash during patch table creation
  - Fixed GLEW compilation and linking with dynamic GLEW libraries on Windows
  - Fixed GLFW linking with GLFW 3.2 on X11 platforms

#### Release 3.1.0 - Oct 2016

Release 3.1.0 is a significant release with several new features, bug fixes, and general code and configuration improvements. For more information on the following, please see Release 3.1

New Features
  - Bicubic Face-Varying Patches
  - Varying and Face-Varying Evaluation
  - Second Order Derivative Evaluation
  - Separate Levels of Feature Isolation
  - Sharp Patches for Infinitely Sharp Features
Changes
  - Enabled the use of CMake's folder feature
  - Removed the use of iso646 alternative keywords ('and', 'or', 'not', etc.) to improve portability
  - Added numerical valued preprocessor directives (OPENSUBDIV_VERSION_MAJOR, etc.) to <opensubdiv/version.h>
  - Improved documentation for Far::PatchParam and added Unnormalize() to complement Normalize()
  - Added additional topology queries to Far::TopologyLevel
  - Updated glFVarViewer and glEvalLimit viewer to make use of bicubic face-varying patches
  - Updated glViewer and dxViewer to add a toggle for InfSharpPatch
  - Updated dxPtexViewer for improved feature parity with glPtexViewer
  - Improved far_regression to exercise shapes independent of Hbr compatibility
  - Added support for Appveyor continuous integration testing
  - Removed cmake/FindIlmBase
  - Removed mayaPolySmooth example
Bug Fixes
  - Fixed Ptex version parsing and compatibility issues
  - Fixed compatibility issues with VS2015
  - Fixed bug interpolating face-varying data with Bilinear scheme
  - Fixed bug with refinement using Chaikin creasing
  - Fixed bugs with HUD sliders in the example viewers

### Release 3.0

#### Release 3.0.5 - Mar 2016

Release 3.0.5 is a minor stability release with performance and correctness bug fixes.

Bug Fixes
  - The previous release reduced transient memory use during PatchTable construction, but increased the amount of memory consumed by the resulting PatchTable itself, this regression has been fixed.
  - The example Ptex texture sampling code has been fixed to prevent sampling beyond the texels for a face when multisample rasterization is enabled.

#### Release 3.0.4 - Feb 2016

Release 3.0.4 is a minor stability release which includes important performance and bug fixes.

New Features
  - Added accessor methods to Far::LimitStencilTable to retrieve limit stencil data including derivative weights
  - Added support for OpenCL event control to Osd::CLVertexBuffer and Osd::CLEvaluator
Changes
  - Major reduction in memory use during Far::PatchTable construction for topologies with large numbers of extraordinary features
  - Improved performance for GL and D3D11 tessellation control / hull shader execution when drawing BSpline patches with the single crease patch optimization enabled
Bug Fixes
  - Restored support for drawing with fractional tessellation
  - Fixed far_tutorial_6 to refine primvar data only up to the number of levels produced by topological refinement
  - Fixed build warnings and errors reported by Visual Studio 2015

#### Release 3.0.3 - Oct 2015

Release 3.0.3 is a minor stability release which includes important performance and bug fixes.

New Features
  - Smooth normal generation tutorial, far_tutorial_8
Changes
  - Major performance improvement in PatchTable construction
  - Improved patch approximations for non-manifold features
Bug Fixes
  - Fixed double delete in GLSL Compute controller
  - Fixed buffer layout for GLSL Compute kernel
  - Fixed GL buffer leak in Osd::GLPatchTable
  - Fixed out-of-bounds data access for TBB and OMP stencil evaluation
  - Fixed WIN32_LEAN_AND_MEAN typo
  - Fixed Loop-related shader issues glFVarViewer

#### Release 3.0.2 - Aug 2015

Release 3.0.2 is a minor release for a specific fix.

Bug Fixes
  - Fixed drawing of single crease patches

#### Release 3.0.1 - Aug 2015

Release 3.0.1 is a minor release focused on stability and correctness.

Changes
  - Added a references section to the documentation, please see References
  - Removed references to AddVaryingWithWeight from examples and tutorials
  - Added more regression test shapes
  - Addressed general compiler warnings (e.g. signed vs unsigned comparisons)
  - Addressed compiler warnings in the core libraries reported by GCC's -Wshadow
  - Eased GCC version restriction, earlier requirement for version 4.8 or newer is no longer needed
  - Replaced topology initialization assertions with errors
  - Improved compatibility with ICC
  - Improved descriptive content and formatting of Far error messages
  - Improved build when configured to include no GPU specific code
Bug Fixes
  - Fixed handling of unconnected vertices to avoid out of bounds data access
  - Fixed non-zero starting offsets for TbbEvalStencils and OmpEvalStencils
  - Fixed Far::StencilTableFactory::Options::factorizeIntermediateLevels
  - Fixed Far::PatchTablesFactory::Options::generateAllLevels
  - Fixed the behavior of VTX_BOUNDARY_NONE for meshes with bilinear scheme
  - Fixed some template method specializations which produced duplicate definitions
  - Disabled depth buffering when drawing the UI in the example viewers
  - Disabled the fractional tessellation spacing option in example viewers since this mode is currently not supported

#### Release 3.0.0 - Jun 2015

Release 3.0.0 is a major release with many significant improvements and changes. For more information on the following, please see Release 3.0

New Features
  - Faster subdivision using less memory
  - Support for non-manifold topology
  - Face-Varying data specified topologically
  - Elimination of fixed valence tables
  - Single-crease patch for semi-sharp edges
  - Additional irregular patch approximations
  - Introduction of Stencil Tables
  - Faster, simpler GPU kernels
  - Unified adaptive shaders
  - Updated coding style with namespaces
  - More documentation and tutorials
Bug Fixes
  - Smooth Face-Varying interpolation around creases

#### Release 3.0.0 RC2

New Features
  - Documentation updates
  - far_tutorial_3 updates for the multiple face-varying channels
  - maya example plugin interpolates a UV channel and a vertex color channel
Bug Fixes
  - Fixed a LimitStencilTableFactory bug, which returns an invalid table
  - PatchParam encoding changed to support refinement levels up to 10
  - Added Xinerama link dependency
  - Fixed MSVC 32bit build problem
  - Fixed minor cmake issues
  - Fixed glViewer/farViewer stability bugs

#### Release 3.0.0 RC1

Changes
  - Far::TopologyRefiner was split into several classes to clarify and focus the API.
  - Interpolation of Vertex and Varying primvars in a single pass is no longer supported.
  - The Osd layer was largely refactored.

### Previous 2.x Release Notes

Previous releases

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