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Obstruction has traditionally been a binary affair. A single ray either hits something or it doesn't, so your sound is either blocked or it isn't, regardless of whether the object in the way is a building or a streetlight.

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Propagation traces rays between spheres around the source and listener instead, giving your title a detailed, continuous result with the power of the GPU behind you, plus full control over how each sound responds: filtering, attenuation, curves and smoothing.

It's available now as part of the SweejTech license, and the overview video below covers the whole system in ten minutes. For an evaluation copy, reach out at sweej.tech or come say hi in our Discord.