Sound Acoustic Physics

The mod reads the current world geometry continuously, so placing or breaking blocks changes sounds that are already playing. Sound changes as a player walks around a wall, steps out of a room or enters water, and transitions between air, water and lava are handled physically. Occlusion is based on wall material thickness, and reflections from walls, floors and ceilings shape reverb according to room size, openings and surface materials. Acoustic properties for blocks and fluids are defined in JSON files, and four quality presets expose detailed settings.

Sound propagates around corners through openings along connected structures. The direct sound path is modeled as a limited first Fresnel-zone wavefront, and when that path is obstructed, a solver traverses the door and passage graph to find full routes, evaluating knife-edge diffraction separately for each frequency band. Sound Acoustic Physics is open source under the MIT License, requires Fabric API, and is published for Fabric, Forge and NeoForge, with files covering 1.21.11 – 26.2 and 26.1.2.