Release v3.1.1.92

This release mainly focuses on performance improvements (especially Marching Cubes and mesh operations), expanded geometry utilities (geodesic paths, loop analysis, subdivision control), stronger C# bindings and .NET support, improved robustness, and new basic SVG import capability.

Performance Improvements

• Marching Cubes acceleration — the marchingCubes were significantly optimized, improving performance up to 5×.
  All algorithms relying on Marching Cubes benefit from this improvement, including:

  • Offset

  • Fusion

  • Mesh Auto Repair (Rebuild)

• Faster ASCII STL reading and improved filtering of STL header data.

• Optimized mesh computations including:

  • ObjectMeshHolder::totalArea()

  • getWorldBox() when transform is identity

  • BitSet::test optimization for MSVC.

• Reduced unnecessary recomputation during interactive mesh editing in SurfaceManipulationWidget.

• Fixed infinite redraw loops and improved rendering of normals and creases.

Geometry & Mesh Processing

• Added GeodesicPath struct for representing geodesic paths on meshes.

• Added findContourPointByLength for retrieving a point along a contour by distance.

• Added curve.totalLength property for curve length calculation.

• Added findShortestEquivalentLoops for topology loop analysis.

• Improved detectTunnelFaces:

  • constructs co-loops in the specified metric

  • filters loops by Euclidean length.

• Mesh subdivision improvements

  • new parameter curvaturePriority in MeshSubdivide.

• Added experimental fusion weights for mesh fusion workflows.

File Format Support

• Added basic SVG import support.

• Improved CSV parsing.

• Text readers now skip BOM markers.

• fromJpeg now supports the parameter ignoreDecompressErrors.

C# / .NET Bindings

• Enabled field caching (“fat objects”) in C# bindings.

• Added implicit conversion Mesh → MeshPart.

• Implemented C# IEnumerable support.

• Added support for deconstructing std::tuple and std::pair in C#.

• Exposed additional functions to bindings.

• Added more platforms to the NuGet package:  Linux x64/Arm, MacOS x64/Arm

• Disabled legacy C and C# bindings in favor of the new system.

Stability & Robustness

• MeshTopology::checkValidity() now prevents out-of-bounds access on corrupted meshes.

• Image::sample avoids invalid memory access when the image is empty.

• Fixed rendering of normals and creases.

• Fixed input lag after moving windows on Linux.

• Various fixes in UI behavior and internal state handling.