Unity offers post-processing effects such as color grading, depth of field etc.
When using MiddleVR for Unity, the post-processes in my application don't have any effect on the rendering.
The most common cause for this is that MiddleVR creates its own cameras which don't have the post-process layer.
In MiddleVR 1.7 or lower, you need to specify a Template Camera in the VRManager options. This camera must be a camera from your scene which has the Post Process Layer.
In MiddleVR 2.0 or higher, the VRManager will automatically use the first active camera it finds in the scene as a template camera.