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Hello,

I am looking to model directivity of a source. I have experimentally measured the directivity of an engine source by taking various SPL’s in a circular fashion at regular intervals while maintaining the same distance at each recording point. I’m looking at using the cone set up in fmod to simulate this directivity..basically the source is louder directly in front (0 degrees) while it is slightly less as the angle increases. As far as I am aware the cone settings allow the programmer to set the gain at an angle inside the cone and outside but only varying in from the one gain you set inside the inner cone..what I would like to implement is a series of cones which would allow me to mimic the actual nature of the source so for example have one cone from +10 deg to -10 deg with the outer angle set to +/- 20 deg at a gain of 0.5 and then another one at an angle +/-30 with an outer angle of +/- 40 degs etc..Is this possible to imlement using the cone set up or if not any suggestions on implementing it..maybe a series of channels emitting the same sound superimposed on to you another but having a lesser gain on the inside of the cone than the outer.

Any suggestions would be helpful

Regards

Mac

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Hi Mac,

Short answer: no, there is only one cone.

However, you can do this quite easily using the FMOD Designer. Simply add an ‘event angle’ parameter to control the volume. If Designer isn’t an option for you, you might need to roll your own.

-Pete

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