Lagrange Release v6.39.0

Infrastructure

• 🏗️ Compilation fixes for Xcode 26
• 🏗️ Fix CMake sanitizer setup for MSVC
• 📌 Update earcut.hpp dependency to f36ced7
• 📌 Update cpptrace to 1.0.4
• 📌 🐛 Update PoissonRecon dependency to fix a memory allocation bug

Core Module

• 🎨 Add overload to SurfaceMesh::delete_attribute to accept id as input

IO Module

• 🐛 Throw error when saving float/double texture to glTF file
• 📖 Add explicit warning when loading glTF without explicit stitching behavior
• 🎨 Add new LoadOptions::quiet to silence IO related log messages
• 🎨 Update STL mesh load to not stitch vertices by default for consistency with other formats

Solver Module

• ✨ Add support for Spectra-based sparse eigenvalue solver
  • [generalized_]selfadjoint_eigen_[largest|smallest]() in C++
  • lagrange.solver.eigsh() in Python (follows a similar API to scipy.linalg.eigsh())

Texproc Module

• 🐛 Fix out-of-bound access in rasterization code
• 🐛 Add checks to ensure number of channels consistency
• 🐍 Update texture_from_multiview.py to accept list of render images + ensure output uses .exr
• 🐛 Fix vertical flip in geodesic_dilation code introduced in v6.38.0
• 🐛 Fix image transpose issue in Python bindings
• 🐍 Add geodesic_dilation.py demo

Geodesic Module

• ✨ New geodesic module to compute single-source and point-to-point geodesic distance
  • Added GeodesicEngine[...] class for repeated computation
  • Choice of algorithm between DGPC, MMP and Heat
  • Two methods available: single_source_geodesic() and point_to_point_geodesic()

Polyddg Module

✨ New polyddg module that implements most of the operators from this paper:

De Goes, F., Butts, A., & Desbrun, M. (2020).
Discrete differential operators on polygonal meshes.
ACM Transactions on Graphics (TOG), 39(4), 110-1.

Documentation

• 📖 Docstring updates for scene module
• 📖 Update voxelize_mesh example code to read/write .vdb files
• 📖 Fixed typos and grammar in comments with Copilot

Python Bindings

• 📌 Updated scikit-build core to 0.11.6
• 📌 Updated sphinx and autoapi
• 🏗️ Set upper-bound to Python <3.14 due to nanobind uncertainty
• 📖 Fixed generated Sphinx documentation due to refactored stub files

Full Changelog: v6.38.0...v6.39.0