v1.31.0

Meep 1.31.0

8/15/2025

• Improved performance for near-to-far transformations in cylindrical coordinates (#3047).

• Experimental (undocumented) new parameter greencyl_tol for get_farfields and Near2FarFields
  in cylindrical coordinates (#3064).

• Experimental (undocumented) new method complexflux() for dft_flux objects, similar to flux()
  but returning the complex Poynting flux (whose imaginary part is reactive power) (#3069).

• Fix compatibility with python 3.12 (#3028).

v1.30.1

• Bug fix in DFT fields at a single point (zero-dimensional volume), where they were only first-order accurate and had the wrong weight (#3010).

v1.30.0

3/27/2025

• Improvements to smoothed projection function of adjoint solver (#2970).

• Bug fix in Harminv wrapper (#2959).

• Bug fix in vec initialization of C++ unit test (#2955).

• Improvements to step function of Python interface (#2895).

• Rename flags in plot2D (#2885).

• Various improvements and additional documentation (#2792, #2862, #2874, #2878, #2883, #2894, #2949, #2950, #2951, #2965, #2978).

v1.29.0

• Experimental support for broadband planewave sources at fixed angle (#2609).

• Support for subpixel smoothing for topology optimization (#2741).

Various improvements and minor bug fixes (#2747, #2751, #2752, #2767, #2285) and additional documentation.

v1.28.0

• Improved special field updates for r=0 in cylindrical coordinates (#2538).

• Geometric objects now have a label field that appears when Simulation.plot2D is called with label_geometry=True (#2631).

• Various improvements and minor bug fixes (#2554, #2599, #2560, #2611, #2684, #2695) and additional documentation.

1.27.0

5/25/2023

• Support for spectral extrapolation using Padé approximants (#2440).

• Support for periodic design regions of adjoint solver (#2465, #2518).

• Support for "unfiltering" a given set of design weights for adjoint optimization (#2462).

• MPB is no longer a required dependency (#2486).

• Bug fix for sources at $r = 0$ in cylindrical coordinates (#2459).

• Additional unit tests and documentation (#2428, #2433, #2452, #2474) and various improvements and minor bug fixes (#2499, #2504).

v1.26.0

Meep 1.26.0

3/9/2023

• Improved Gaussian beam source in 2D (#2333).

• Support for returning the number of timesteps elapsed in simulation (#2337).

• Bug fix for fields update in cylindrical coordinates (#2382).

• Bug fix for PMLs in cylindrical coordinates (#2383).

• Bug fix in amplitude function of eigenmode source (#2394).

• The doc/ directory (the manual) is no longer included in the release tarball to save space, since most people will view this online. (It is still in the git repository.)

• Various improvements and minor bug fixes (#2321, #2349, #2371, #2380, #2390, #2413), and additional unit tests and documentation (#2314, #2360, #2364, #2365, #2387, #2395, #2402).

v1.25.0

Meep 1.25.0

11/17/2022

• Support for connectivity constraints in adjoint solver (#2207).

• Support for animation in topology optimization (#2186).

• Support for load_minus_flux in adjoint solver (#2271).

• Support colorbars in plot2D (#2289).

• Support for plot3D (#2305).

• Various improvements and bug fixes (#2176, #2179, #2190, #2194, #2202, #2203, #2208, #2251, #2253, #2264, #2290), and additional unit tests and documentation.

v1.24.0

• Support for adjoint gradients of local density of states (LDOS) (#2077).

• Improvements to memory usage of adjoint solver (#1855).

• Various bugfixes (#1959, #2044, #2066, #2073, #2079, #2091, #2095, #2114) and additional unit tests (#2032, #2049, #2053, #2076, #2082).

v1.23.0

4/6/2022

• Support for termination condition function based on the field energy in the entire cell (#2021).

• Support for mode decomposition for 2d cell with out of plane wavevector (#1968).

• Type annotations for the Simulation class (#1919).

• Various improvements (#1821, #1895, #2027), bug fixes (#1955, #2016), and additional documentation (#2005).