# Shape of audio emitter?

**URL:** <https://qa.fmod.com/t/shape-of-audio-emitter/20957>\
**Category:** FMOD Studio\
**Tags:** unity\
**Created:** [December 5, 2023, 12:12pm UTC](https://qa.fmod.com/t/shape-of-audio-emitter/20957 "2023-12-05T12:12:33Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![trjaudio](https://avatars.discourse-cdn.com/v4/letter/t/ea666f/32.png) [@trjaudio](https://qa.fmod.com/u/trjaudio)\
**Post date:** [December 5, 2023, 12:12pm UTC](https://qa.fmod.com/t/shape-of-audio-emitter/20957/1 "2023-12-05T12:12:33Z")

</div>

Hi. I am using Unity.  
I have a project where I want the sound to have a cone like shape. Coming from the ceiling and pointing down at the floor. Just imagine a lamp in the ceiling shining down on the floor. I want a pretty narrow cone with a natural fall off once you step outside the cone area.

In unreal you can shape your audio emitters (cone, circle etc) and point them in specific directions.

How can I do this with fmod? I have read the manual and read about the spatializer and its direction/extent, but can’t seem to get the wanted behaviour.

Any tips or tricks?  
Thanks

---

<div class="post-metadata">

**Author:** ![Leah\_FMOD](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/leah_fmod/32/3685_2.png) [@Leah\_FMOD](https://qa.fmod.com/u/Leah_FMOD)\
**Post date:** [December 6, 2023, 12:51am UTC](https://qa.fmod.com/t/shape-of-audio-emitter/20957/2 "2023-12-06T00:51:37Z")

</div>

Hi,

What you’re looking for is the [Event Cone Angle](https://www.fmod.com/docs/2.00/studio/parameters-reference.html#event-cone-angle) built-in parameter, which gives you the angle between the direction the event is facing, and the direction the listener is in. You can use this to automate your event properties - in this case, you’ll probably want to automate a fader to control the volume. For example, based on the behavior you’ve described, what you’re trying to do might look like this:

![ECA](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/a/aeb9ae232effcd43f33b1abb216c2b9c1e92f3f7.png)

The only other thing to note is that Event Cone Angle only considers the horizontal plane - to have a “vertical cone”, in Unity you’ll need to rotate the Emitter to face downwards.

---

<div class="post-metadata">

**Author:** ![trjaudio](https://avatars.discourse-cdn.com/v4/letter/t/ea666f/32.png) [@trjaudio](https://qa.fmod.com/u/trjaudio)\
**Post date:** [December 6, 2023, 10:33am UTC](https://qa.fmod.com/t/shape-of-audio-emitter/20957/3 "2023-12-06T10:33:23Z")

</div>

Awesome. Thanks!