---
title: "Dynamic Portal Occlusion for Precomputed Interactive Sound Propagation"
authors: ["Chakravarty R. Alla Chaitanya", "Nikunj Raghuvanshi", "Keith W. Godin", "Zechen Zhang", "Derek Nowrouzezahrai", "John M. Snyder"]
year: 2021
venue: "arXiv"
arxiv: "2107.11548"
doi: "10.48550/arXiv.2107.11548"
source: "https://arxiv.org/abs/2107.11548"
topics: [occlusion-portals, dynamic-scenes, interactive]
seed_rank: 1735
seed_batch: "audio-harvest-2026-09-09"
reviewed: "2026-09-09"
pool: "engines"
relevance_score: 10
lineage: interactive-sound-propagation
cites:
  - title: "Parametric Directional Coding for Precomputed Sound Propagation"
    url: "https://doi.org/10.1145/3197517.3201339"
    year: 2018
    arxiv: null
    doi: "10.1145/3197517.3201339"
  - title: "Directional sources and listeners in interactive sound propagation using reciprocal wave field coding"
    url: "https://doi.org/10.1145/3386569.3392459"
    year: 2020
    arxiv: null
    doi: "10.1145/3386569.3392459"
  - title: "Triton: Practical Pre-Computed Sound Propagation for Games and Virtual Reality"
    url: "https://doi.org/10.1121/1.4987164"
    year: 2017
    arxiv: null
    doi: "10.1121/1.4987164"
see:
  - "1671-parametric-directional-coding-for-precomputed-sound-propagation"
  - "1733-directional-sources-and-listeners-in-interactive-sound-propagation"
  - "1678-triton-practical-pre-computed-sound-propagation-for-games-and-virtual"
---

# Dynamic Portal Occlusion for Precomputed Interactive Sound Propagation

## One-sentence takeaway

Dynamic portal occlusion on a *precomputed* wave field: open/close doors by modulating baked transfer instead of rebaking (Chaitanya/Raghuvanshi et al., arXiv 2107.11548).

## Why it matters here

Triton bakes die when a blast door moves. This 2021 arXiv (Project Acoustics authors) is the portal leftover: treat openings as dynamic operators on a static bake. Anoptic interiors must have this or 2D wave (1754).

## Key ideas

- **Portals as dynamic occlusion** on precomputed interactive sound.
- **arXiv 2107.11548** (DOI 10.48550/arXiv.2107.11548).
- **Microsoft wave-coding line.** Same authors as 2020 reciprocal coding.
- **Geometry mostly static; doors aren't.**

## Caveats

Portal model ≠ arbitrary destruction. arXiv vs TOG. Not geometric GSound path cache. Not FDTD live.

## Links

- arXiv abs: https://arxiv.org/abs/2107.11548
- PDF: https://arxiv.org/pdf/2107.11548
- DOI: https://doi.org/10.48550/arXiv.2107.11548