/// <summary>Get the signal that a listener at a given position would perceive</summary>
/// <param name="listenerPosition">The listener's position in world space</param>
/// <param name="use2D">True if distance calculation should ignore Z</param>
/// <param name="pos">The position impulse signal</param>
/// <param name="rot">The rotation impulse signal</param>
/// <returns>true if non-trivial signal is returned</returns>
public bool GetDecayedSignal(
Vector3 listenerPosition, bool use2D, out Vector3 pos, out Quaternion rot)
{
if (m_SignalSource != null)
{
float distance = use2D ? Vector2.Distance(listenerPosition, m_Position)
: Vector3.Distance(listenerPosition, m_Position);
float time = Instance.CurrentTime - m_StartTime
- distance / Mathf.Max(1, m_PropagationSpeed);
float scale = m_Envelope.GetValueAt(time) * DistanceDecay(distance);
if (scale != 0)
{
m_SignalSource.GetSignal(time, out pos, out rot);
pos *= scale;
rot = Quaternion.SlerpUnclamped(Quaternion.identity, rot, scale);
if (m_DirectionMode == DirectionMode.RotateTowardSource && distance > Epsilon)
{
Quaternion q = Quaternion.FromToRotation(Vector3.up, listenerPosition - m_Position);
if (m_Radius > Epsilon)
{
float t = Mathf.Clamp01(distance / m_Radius);
q = Quaternion.Slerp(
q, Quaternion.identity, Mathf.Cos(Mathf.PI * t / 2));
}
pos = q * pos;
}
return(true);
}
}
pos = Vector3.zero;
rot = Quaternion.identity;
return(false);
}
/// <summary>Get the signal that a listener at a given position would perceive</summary>
/// <param name="pos">The position impulse signal</param>
/// <param name="rot">The rotation impulse signal</param>
/// <returns>true if non-trivial signal is returned</returns>
public bool GetDecayedSignal(Vector3 listenerPosition, out Vector3 pos, out Quaternion rot)
{
if (m_SignalSource != null)
{
float time = Time.time - m_StartTime;
float distance = Vector3.Distance(listenerPosition, m_Position);
float scale = m_Envelope.GetValueAt(time) * DistanceDecay(distance);
m_SignalSource.GetSignal(time, out pos, out rot);
pos *= scale;
rot = Quaternion.SlerpUnclamped(Quaternion.identity, rot, scale);
return(true);
}
pos = Vector3.zero;
rot = Quaternion.identity;
return(false);
}
//VirtualCamera用来在流水线中计算State的接口
public override void MutateCameraState(ref CameraState curState, float deltaTime)
{
if (!IsValid || deltaTime < 0)
{
return;
}
if (ShakeSetting == null || mNoiseTime > ShakeSetting.SignalDuration)
{
return;
}
mNoiseTime += deltaTime;
ShakeSetting.GetSignal(mNoiseTime, out Vector3 pos, out Quaternion rot);
//因为这里是希望实现的是震屏功能，所以需要将ShakeSetting计算出的相机空间中的偏移量，转化为世界坐标中的偏移量。
//直接用相机的旋转生成的矩阵乘一下就可以了
shakeMatrix.SetTRS(Vector3.zero, curState.FinalOrientation, Vector3.one);
//把位置偏移量应用到State上
curState.PositionCorrection += shakeMatrix.MultiplyPoint(-pos);
rot = Quaternion.SlerpUnclamped(Quaternion.identity, rot, -1);
//把旋转偏移量应用到State上
curState.OrientationCorrection = curState.OrientationCorrection * rot;
}
public void GetSignal(out Vector3 pos, out Quaternion rot)
{
ShakeSource.GetSignal(Instance.CurrentTime - StartTime, out pos, out rot);
}
