In UDK Post Process Volumes had a value called “Scene Interpolation Duration” which would allow you to specify a value of time in which the post process effect would fade away when leaving the volume. I can’t find any way to achieve this with UE4. Is this feature not implemented yet?
No, it is not implemented. However, you can use Blend Weight and animate it with a Timeline if you like. It is also a separate parameter than post process settings(that scary, giant node) so it is quite easy to implement really.
Ok interesting. Strange that they would program the post process volumes without implementing the interpolation duration. Its pretty much a required component. Ahh well, thanks for the workaround anyway 