Issues

• Parallel HDF5 files are opened on MPI_COMM_WORLD, so file I/O inside divide_parallel_processes subgroups hangs

  NanoComp/meep#3354 · Filter by author laghai opened on Oct 24, 2026

• Adjoint gradient of a MaterialGrid with D_conductivity is divided by (1 + iσ_D/ω)

  NanoComp/meep#3349 · Filter by author bk-squared opened on Oct 21, 2026

• py_do_harminv aborts the process (std::bad_alloc) when passed a numpy array

  NanoComp/meep#3347 · Filter by author laghai opened on Oct 20, 2026

• adjoint gradient wrong when geometry_center is not a multiple of the grid spacing

  NanoComp/meep#3345 · Filter by author laghai opened on Oct 20, 2026

• Extending the dispersive stability check (#3326) to cylindrical coordinates

  NanoComp/meep#3343 · Filter by author nes123 opened on Oct 19, 2026

• cSi library material has a gain band (negative-strength pole): fields grow at any time step

  NanoComp/meep#3334 · Filter by author nes123 opened on Oct 10, 2026
  1

• Quasi-reflector boundary conditions

  NanoComp/meep#3306 · Filter by author smartalecH opened on Sep 11, 2026
  1

• Adjoint gradient is wrong when the objective monitor lies on a symmetry plane (3/4 on-plane; O(dx) crossing)

  NanoComp/meep#3291 · Filter by author smartalecH opened on Sep 2, 2026
  1

• A dispersive MaterialGrid is silently non-dispersive in the forward simulation

  NanoComp/meep#3288 · Filter by author smartalecH opened on Aug 30, 2026

• n vs n+1 error when loading structure

  NanoComp/meep#3282 · Filter by author SaLukasik opened on Aug 26, 2026
  6

• Improve adjoint test hygiene

  adjoint optimizationunit tests
  NanoComp/meep#3278 · Filter by author smartalecH opened on Aug 25, 2026
  3

• add custom swig typemap for C++ enums that does value checks

  enhancement
  NanoComp/meep#3276 · Filter by author stevengj opened on Aug 21, 2026

• recommend python -m mpi4py when running Python scripts with MPI

  documentationenhancement
  NanoComp/meep#3272 · Filter by author stevengj opened on Aug 14, 2026

• Single-frequency adjoint passes an array as EigenModeSource amplitude; NumPy deprecation will become an error

  NanoComp/meep#3260 · Filter by author jin-castle opened on Aug 7, 2026

• Wrong size of Block in simulation

  NanoComp/meep#3250 · Filter by author leSemaleon opened on Jul 10, 2026

• exploit inner_gradients=0 option in latest NLopt release

  enhancement
  NanoComp/meep#3247 · Filter by author stevengj opened on Jul 9, 2026

• MPI-dependent deposition for 2D point and zero-height line sources on chunk boundaries

  NanoComp/meep#3232 · Filter by author meNOwanTstudy opened on Jun 19, 2026

• check sym_matrix_positive_definite for materials in meepgeom.cpp

  enhancement
  NanoComp/meep#3231 · Filter by author stevengj opened on Jun 18, 2026

• Subpixel averaging for dispersive (anisotropic) susceptibilities

  enhancement
  NanoComp/meep#3229 · Filter by author oskooi opened on Jun 13, 2026
  1

• Are Casimir force functions removed in recent Meep versions?

  NanoComp/meep#3228 · Filter by author xiewenjia2001 opened on Jun 8, 2026
  1

• Need for updated compilation from source tutorial

  NanoComp/meep#3227 · Filter by author SaLukasik opened on Jun 5, 2026
  1

• sidewall angles in mp.get_GDSII_prisms

  enhancement
  NanoComp/meep#3226 · Filter by author SaLukasik opened on Jun 5, 2026
  1

• Possible instability with Mirror(Y, phase=-1) + eps_averaging=True in 3D FDTD

  NanoComp/meep#3222 · Filter by author kabume opened on May 27, 2026

• scalable Pade extrapolation

  enhancement
  NanoComp/meep#3217 · Filter by author stevengj opened on May 8, 2026
  1

• add trigger for make check-adjoint to run on labelled PRs

  enhancement
  NanoComp/meep#3216 · Filter by author stevengj opened on May 8, 2026