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Hi,

I’m looking to learn more about the ‘3D Auto Distance Filtering’ feature that’s somewhat new’ish to Designer. I didn’t see it mentioned in the manual and only found one forum post about it. Some questions:
– It seems to be aimed at car sounds, but does it have other applications? How would one use it in a driving game?
– What does it do as the sound moves closer/further from the listener?
– Any guidelines for setting the ‘3D Auto Distance Centre Freq’?
– If I set my ‘3D Rolloff’ to ‘Custom’, can I use this feature? It uses ‘3D Min Distance’ (and Max) and I understand those settings are ignored if you use a ‘3D Rolloff’ of ‘Custom’. I tend to prefer using ‘Custom’ rolloffs for everything (bad idea?).

Thanks,
Sean

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Hi Sean,

We haven’t gotten around to documenting that feature yet, please excuse us! Refer to this post for a discussion on how it works:

viewtopic.php?f=7&t=14939

It’s designed for any 3D sounds, not just vehicles, and will ‘thin’ the sound out as the distance of the event goes from the minimum to the maximum distance regardless of your rolloff type. You can continue to use custom rolloffs for your volume attenuation but it will not affect the built-in filtering rolloff. If you want to achieve a similar result but have greater control over the filtering, I would recommend turning it off and using your own automation on the occlusion level (for the low-pass filtering) and also automating the high-pass filter cutoff over distance.

Cheers,
Gino

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Thanks, Gino. I haven’t played with it yet, but it sounds like a great addition.

I use the Occlusion effect and often want to add a high pass filter to thin out the sound as it gets further away, but I’m always worried that I’ll chew up too much DSP CPU usage. I take it that the 3D Auto Distance Filtering is much more CPU efficient than adding a high pass to every layer in every 3D event (similar to how the Occlusion effect is more efficient than adding a low pass filter to every layer in every event)?

As for ‘3D Auto Distance Centre Freq’, I take it that I should lower this from 22500Hz if I want the sound to become less thin as it approaches the 3D Max Distance.

Lastly, is having both 3D Auto Distance Filtering and Occlusion active on an event/layer a bad idea, since there will be 2 low pass filters active and affecting the event/layers?

Thanks,
Sean

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