# Let a local FMOD parameter influence an animator state

**URL:** <https://qa.fmod.com/t/let-a-local-fmod-parameter-influence-an-animator-state/19729>\
**Category:** Unity\
**Tags:** unity\
**Created:** [January 12, 2023, 11:39am UTC](https://qa.fmod.com/t/let-a-local-fmod-parameter-influence-an-animator-state/19729 "2023-01-12T11:39:42Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![RemyLIS](https://avatars.discourse-cdn.com/v4/letter/r/5f8ce5/32.png) [@RemyLIS](https://qa.fmod.com/u/RemyLIS)\
**Post date:** [January 12, 2023, 11:39am UTC](https://qa.fmod.com/t/let-a-local-fmod-parameter-influence-an-animator-state/19729/1 "2023-01-12T11:39:42Z")

</div>

Hi guys,

I’m an audio engineer and been using FMOD for a while now. I’ve recently been coding a bit more, thanks to chatGPT and some basic understanding. I’m trying to write code that can take a local parameter’s information and based on the FMOD paramer, send a animator parameter (trigger) to a connected animator.

For visual reference: I’m creating a band that plays music. The music has certain parts where the drummer plays, other parts where he doesn’t. So I thought if I have a parameter for whether he “isPlaying” and “stopPlaying” which I control with a Command Instrument (who sets the parameter), for every band member in the arrangement.

So I think it works to set the value of the parameter in FMOD with the command instrument. Now, I only need to make a script in Unity that sends those values to a connected animator and trigger an animator state. Can anyone help me deceiver this code and make it work? One problem I already know is that the code is constantly triggering the animator controller trigger. It should do that only once (as it’s a trigger and not a boolean). Now, it’s kind of stuck on “stopPlaying”. I’m using a labeled parameter in FMOD. 0 = stopPlaying. 1 = startPlaying.

```auto
using UnityEngine;
using FMODUnity;

public class FMODAnimatorController : MonoBehaviour
{
    [SerializeField] private Animator animator;
    [SerializeField] private StudioEventEmitter fmodEvent;
    [SerializeField] private string stopPlayingParameter;
    [SerializeField] private string startPlayingParameter;
    [SerializeField] private FMOD.Studio.PARAMETER_ID localFMODParameter;

    private void Start()
    {
        fmodEvent.Play();
        Debug.Log("FMOD event has started playing.");
    }

    private void Update()
    {
        float localFMODParameterValue;
        fmodEvent.EventInstance.getParameterByID(localFMODParameter, out localFMODParameterValue);
        Debug.Log("Local FMOD parameter name: " + localFMODParameter);
        if (localFMODParameterValue == 0)
        {
            animator.SetTrigger(stopPlayingParameter);
            Debug.Log("Animator trigger for " + stopPlayingParameter + " has been set.");
        }
        else if (localFMODParameterValue == 1)
        {
            animator.SetTrigger(startPlayingParameter);
            Debug.Log("Animator trigger for " + startPlayingParameter + " has been set.");
        }
    }
}

```

---

<div class="post-metadata">

**Author:** ![Connor\_FMOD](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/connor_fmod/32/3685_2.png) [@Connor\_FMOD](https://qa.fmod.com/u/Connor_FMOD)\
**Post date:** [January 13, 2023, 3:02am UTC](https://qa.fmod.com/t/let-a-local-fmod-parameter-influence-an-animator-state/19729/2 "2023-01-13T03:02:43Z")

</div>

Hi,

So there are a couple of ways you could do this.

You could check every frame if the value of `localFMODParameter` is different from the last frame, if so then you can change the animator’s value based on the new value.

```auto
Update()
{
    fmodEvent.EventInstance.getParameterByID(localFMODParameter, out localFMODParameterValue, 
    out localFMODParameterFinalValue);
    if (localFMODParameterFinalValue != cachedValue)
    {
        anims.SetFloat("Trigger", localFMODParameterFinalValue);
        cachedValue = localFMODParameterFinalValue;
    }
}

```

This is probably the easiest method code wise. You could also utilize `FMOD_STUDIO_EVENT_CALLBACK` ([FMOD API | Studio API](https://fmod.com/docs/2.02/api/studio-api-eventinstance.html#fmod_studio_event_callback_type)) in conjunction with markers ([FMOD Studio | Glossary](https://fmod.com/docs/2.02/studio/glossary.html#destination-marker)) to only trigger when the `Command Instrument` is activated.

> **Using callbacks**
>
> ```cpp
> using System;
> using System.Collections.Generic;
> using UnityEngine;
> using System.Runtime.InteropServices;
> using System.Reflection;
> using static UnityEditor.Profiling.RawFrameDataView;
> 
> [RequireComponent(typeof(FMODUnity.StudioEventEmitter))]
> public class GetCurrentParamValue : MonoBehaviour
> {
> public FMODUnity.StudioEventEmitter emitter;
> public Animator anims;
> 
> private FMOD.Studio.EVENT_CALLBACK marker;
> // Start is called before the first frame update
> void Start()
> {
> marker = new FMOD.Studio.EVENT_CALLBACK(MarkerCallback);
> GCHandle animHandle = GCHandle.Alloc(anims);
> emitter.EventInstance.setUserData(GCHandle.ToIntPtr(animHandle));
> emitter.EventInstance.setCallback(marker);
> }
> 
> [AOT.MonoPInvokeCallback(typeof(FMOD.Studio.EVENT_CALLBACK))]
> static FMOD.RESULT MarkerCallback(FMOD.Studio.EVENT_CALLBACK_TYPE type, IntPtr instancePtr, IntPtr parameterPtr)
> {
> FMOD.Studio.EventInstance inst = new FMOD.Studio.EventInstance(instancePtr);
> IntPtr animsPtr;
> inst.getUserData(out animsPtr);
> 
> GCHandle animsHandle = GCHandle.FromIntPtr(animsPtr);
> Animator anims = animsHandle.Target as Animator;
> 
> switch(type)
> {
> case FMOD.Studio.EVENT_CALLBACK_TYPE.TIMELINE_MARKER:
> inst.getParameterByName("IsPlaying", out float value, out float finalValue);
> SetAnimationValue(finalValue, anims);
> break;
> case FMOD.Studio.EVENT_CALLBACK_TYPE.DESTROYED:
> animsHandle.Free();
> break;
> }
> return FMOD.RESULT.OK;
> }
> 
> private void OnDestroy()
> {
> emitter.Stop();
> }
> 
> static void SetAnimationValue(float newValue, Animator anims)
> {
> // Set the anims value here
> Debug.Log("The new value is " + newValue);
> }
> }
> 
> ```

However, that is a lot more involved.

Hope this helps!