3D.ru

int layerMask = 1 << 10;
                layerMask = ~layerMask;
                RaycastHit hitLeftFoot;
                if(Physics.Raycast(leftFootLocation.position,Vector3.down,out hitLeftFoot,distRayCheck,layerMask)){
                        Debug.DrawRay(leftFootLocation.transform.position, transform.TransformDirection(-Vector3.up) * hitLeftFoot.distance, Color.red);
                        leftFootAudioSource.PlayOneShot(impactLeft, 0.7F);
                }
                RaycastHit hitRightFoot;
                if(Physics.Raycast(rightFootLocation.position,Vector3.down,out hitRightFoot,distRayCheck,layerMask)){  
                        Debug.DrawRay(rightFootLocation.transform.position, transform.TransformDirection(-Vector3.up) * hitRightFoot.distance, Color.red);
                        rightFootAudioSource.PlayOneShot(impactRight, 0.7F);
                }
        }
 

private bool haveHit = false;

private void Update()
{
    if(Physics.Raycast())
    {
        TryPlaySound();
        haveHit = true;
    }else{
        haveHit = false;
    }
}


private bool TryPlaySound()
{
    if(haveHit)
        return;

    AudioSource.PlayOneShot();
}