2022-08-31【unity】Cinemachine源码分析

• CinemachineBrain.ManualUpdate

m_LastFrameUpdated：总Frame数量
deltaTime
UpdateFrame0(deltaTime)

1012041001
outGoingCamera：frame.blend.camB：FakeJnCamera
LookupBlend(outGoingCamera, activeCamera)
blend = GetBlend(from,to)
BlendAB

如果突然激活一个VirtualCameraGameObject，会触发
activeCamera != outGoingCamera
m_CustomBlends.GetBlendForVirtualCameras(from, to, blend)
找到anyToMe_Blend 和 meToAny_Blend

ComputeCurrentBlend

BrainFrame.workingBlend.CamA：null
BrainFrame.workingBlend.CamB：FakeJnCamera
BlendCurve：null
Duration：0
TimeInBlend：0
=》outputBlend
LookupBlend

UpdateVirtualCameras

Camera camera = OutputCamera
CinemachineCore.Instance.UpdateAllActiveVirtualCameras

• UpdateVirtualCamera
  LateUpdate：int frameDelta = Time.frameCount - status.lastUpdateFrame
  deltaTime *= frameDelta //try to catch up if multiple frames 如果更新了多帧，追赶上
  (CinemachineVirtualCamera)vcam.InternalUpdateCameraState(deltaTime)
  • UpdateTargetCache
    Follow：FakeJnCamera
    LookAt：Null
  • m_State = CalculateNewState(deltaTime)
    • PullStateFromVirtualCamera
      state.RawPosition = TargetPositionCache.GetTargetPosition(transform)
      state.RawRotation = TargetPositionCache.GetTargetRotation(transform)CacheMode == Mode.Disabled，直接返回transform坐标旋转
      lens.SnapshotCameraReadOnlyProperties(brain.OutputCamera)// 记录相机参数
    • UpdateComponentPipeline
  • ApplyPositionBlendMethod

mCurrentLiveCameras.UpdateCameraState

ProcessActiveCamera

1.判断SoloCamera是否存在
2.判断当前是否有激活VirtualCamera，没有的话会根据当前CinemachineBrain所在位置创建一个虚假的CameraState进行过渡。
RawPosition; RawOrientation; Lens; BlendHint
3.两个相机过渡
PushStateToUnityCamera
CurrentCameraState = state
CinemachineCore.CameraUpdatedEvent.Invoke(this);=>
CinemachineStoryboard.StaticBlendingHandler(brain)
CinemachineVolumeSettings.ApplyPostFX(brain)