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Simulating how sound actually travels through a game world -- around corners, through doorways, and across distances.
Sound propagation models how audio waves move through a 3D environment. In reality, sound doesn't just travel in straight lines -- it diffracts around corners, reflects off surfaces, transmits through materials at different speeds, and attenuates over distance. Game propagation systems approximate these physics using techniques ranging from simple distance falloff curves to sophisticated ray-casting and wave simulation. Advanced systems track the shortest sound path between source and listener, including indirect paths through open doors and around walls, and apply appropriate filtering at each step. The computational cost is significant, which is why many games still use simplified models.
Example
In Rainbow Six Siege, sound propagation is a core gameplay mechanic -- audio travels through the shortest physical path, so a sound that's one wall away in distance might be three rooms away in audio travel, giving defenders crucial intel. Overwatch 2 uses sound propagation to ensure ability audio cues reach players through meaningful paths rather than through walls.
Why it matters
Accurate sound propagation transforms audio from a flat overlay into a physical system that interacts with architecture. In competitive games, it creates a layer of spatial intelligence that rewards map knowledge. In immersive single-player games, it makes every space feel acoustically real.
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