Architectural room-acoustics first pass for a BIM space: from the room dimensions and a surface-absorption schedule it computes the total absorption and the reverberation time RT60 by both Sabine (0.161 V/A) and Eyring (high-absorption form), the Schroeder transition frequency, and the EXACT rectangular-room mode frequencies up to a cutoff - classified axial / tangential / oblique with the modal density.
Architectural room-acoustics first pass for a BIM space: from the room dimensions and a surface-absorption schedule it computes the total absorption and the reverberation time RT60 by both Sabine (0.161 V/A) and Eyring (high-absorption form), the Schroeder transition frequency, and the EXACT rectangular-room mode frequencies up to a cutoff - classified axial / tangential / oblique with the modal density. The lowest axial mode is c/(2L) exactly, Eyring collapses to Sabine as absorption -> 0, and the enumerated mode count is checked against the Weyl asymptotic V(4pi/3)(f/c)^3. Honest scope: Sabine/Eyring assume a diffuse field; the modal analysis assumes a rigid rectangular room; single absorption band per run (repeat per octave). A design aid, not a measurement (ISO 3382 is a measurement standard) - for the modal region of a non-rectangular room use the companion acoustic FDTD plugin. Deterministic, in-browser, no API/key/network/AI.
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