v2.2.1

This is another significant update, bringing 2D support, lossless roundtrip of Manifolds through glTF, Python bindings published on PyPI, and a whole new triangulator that fixes lots of geometric edge cases in the Boolean. And of course many bug fixes and performance improvements - a huge thank you to all the contributors!

New Features

• New 2D subsystem, CrossSection, powered by Clipper2. #341, #376 (@geoffder)
• Added Mirror transform. #354 (@geoffder)
• Improved input error handling. #385 (@geoffder)
• Added a Merge helper to turn nearly-manifold input meshes into Manifolds. #394, #481 (@elalish)
• Added SetProperties for computing arbitrary vertex properties. #433 (@elalish)
• Replaced GetCurvature with CalculateCurvature (breaking change). #448 (@elalish)
• Allow partial revolutions. #455 (@cartesian-theatrics)
• Added convex hull ops. #486, #489 (@geoffder)

Bindings

• Updated C bindings. #353, #382, #434 (@geoffder)
• Fix Vite build. #371 (@jirihon)
• Updated JS bindings. #375, #393, #440 (@elalish, @jirihon, @geoffder)
• Added Python bindings. #378, #445, #459, #488, #492, #558 (@pca006132, @johnnybigert, @axel-angel, @elalish, @zalo)
• Built a glTF manifold extension with JS I/O. #420 (@elalish)
• Thread-safety for SDF C-binding. #427 (@harmanpa)
• Switch to nanobind for python - API now requires numpy. #537 (@pca006132)

Bug Fixes

• Make cache thread-safe. #357 (@pca006132)
• Fix flipped triangles in Compose. #404 (@pca006132)
• Added global coplanarity check. #408 (@elalish)
• Fixed Warp simplification. #416 (@elalish)
• Fixed Compose index error. #430 (@pca006132)
• Fixed decimator seg-fault. #447 (@elalish, @Loosetooth)
• Workaround for Assimp 3MF export. #454 (@geoffder)
• Fixed WASM seg-fault. #474 (@elalish)
• Fixed conflicting numbers of properties. #480 (@elalish)
• Fixed a crash on a particular self-intersected model. #501 (@stephomi)
• Fixed precision calculation. #508 (@elalish)
• Fixed decimator odd number of halfedges. #534 (@pca006132)
• Fixed aliasing in SparseIndices. #540 (@pca006132)
• Improved determinism. #550 (@pca006132)
• Fixed incorrect properties output from Boolean. #587 (@elalish)
• Fixed NaN halfedge tangents. #588 (@elalish)
• Fixed a variety of geometrically incorrect complex Boolean results. This all comes down to our polygon triangulator, which had grown increasingly complex. I finally decided to pull the plug and start over with a new algorithm. It is now simpler and significantly more robust. The test suite was also expanded considerably. Developing this new algorithm was the main driver pushing this release to be a few months later than intended. #564 (@elalish)

Performance Improvements

• Lazy transformations for CrossSection. #355 (@geoffder)
• Early simplification of op tree. #368 (@ochafik)
• Parallelize some CSG ops. #381 (@pca006132)
• Doubled the speed of some ops by using hash tables. #484 (@stephomi)
• Improve decimator loops. #483 (@pca006132)
• Optimize sorting. #493, #494 (@stephomi)
• Improved parallelization. #503, #522 (@pca006132)
• Removed OMP and CUDA backends to focus on TBB. #525, #531 (@pca006132)
• Replaced graphlite with union-find. #569 (@pca006132)

Build/CI Updates

• Formatting checks for more languages. #441 (@elalish)
• Improved dependency resolution. #523, #559 (@pca006132)
• Allow macOS 10.13 building. #577 (@pca006132)

Examples

• Added a convertFile utility. #407 (@elalish)
• Built make-manifold page to test Merge and EXT_manifold. #428 (@elalish)
• Fixed CGAL perf test. #575 (@sloriot)

ManifoldCAD.org

• Added GLTFNode and GLTFMaterial for scene hierarchy, vertex property, and material output. #438 (@elalish)
• Made robust to library crashes. #442 (@elalish)
• Added 3MF export. #500, #505, #517 (@pca006132, @elalish)