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Changelog

All notable changes to this project will be documented in this file.

[v0.1.0] - 2026-05-10

Added

  • 3D FDTD engine – Full 3D acoustic wave propagation built on top of the 2D prototypes, accelerated with Taichi.
  • PML boundary conditions – Perfectly Matched Layer absorbing boundaries in 3D with configurable thickness and alpha_max.
  • Voxelizer with .obj scene loading – Convert arbitrary triangulated rooms into a voxel grid, auto-centre the mesh, and map per-face materials.
  • Material Library – CSV-backed catalogue of acoustic materials (absorption, density, colour) with a dedicated GUI for adding, editing, and removing entries.
  • Multi-source / multi-receiver setup – Place an arbitrary number of sources and microphones, each with its own name, position, duration, and volume.
  • Custom waveforms – Sources can emit either parametric Gaussian pulses or arbitrary user-supplied WAV files, with automatic frequency analysis driving grid resolution.
  • Interactive 3D placement – Click-to-place workflow for positioning sources and microphones inside the loaded scene.
  • Tkinter GUI – Main menu, new-simulation wizard, post-setup dialog, and materials window covering the full configuration flow.
  • Real-time 3D visualisation – Taichi viewer rendering the room mesh together with XY / XZ / YZ pressure slices, with log-scale display, pause, simulation timer, and step counter.
  • Project save / load (.npz) – Persist the full simulation configuration alongside the voxel cache; reload it later in the GUI for editing, with frequency-vs-grid validation on load.
  • WAV audio output – Per-receiver recordings written to disk as WAV files together with pressure-over-time plots.
  • Test scenes – Bundled Blender-authored .obj rooms for quickly trying different geometries and material setups.
  • Project structure – Reorganised the repository into clear assets/, data/, and output/ directories.

[v0.0.1] - 2026-03-11

Added

  • 2D FDTD prototypes – Implemented simple 2D Finite-Difference Time-Domain simulations to experiment with acoustic wave propagation and understand the method before moving to the full 3D implementation. Two prototype variants were created: one using Dirichlet boundary conditions and another using Neumann boundary conditions.
  • CFL stability check – Added automatic calculation of the maximum stable time step based on the Courant–Friedrichs–Lewy condition to ensure the simulation remains stable.
  • 2D visualization prototype – Added a basic real-time visualization of the acoustic pressure field using the Taichi GUI to help observe how the simulation behaves.