| cam | 要准备处理 VFX 命令的摄像机。 |
使用此方法为此帧准备和处理每个摄像机的 VFX 命令。
由可编程渲染管线 (SRP) 负责调用此函数。高清渲染管线和通用渲染管线都实现了此调用，但是如果创建自己的 SRP，则必须手动实现。 此函数等效于 VFXManager.PrepareCamera(cam) 后跟 VFXManager.ProcessCameraCommand(cam, null)。
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