Help with Box Mask 3D Post Process material.

[PharosSentinel]

I am trying to create a blueprint class that I can place in my levels to operate as “Dark Zones”

This class will just be a simple blueprint class with a post process and a box collision.

On construction it sets values of a material parameter collection for the boxs orgin point and the box extent.

I then Want to take this data into my material to use in the post process material to determine if a pixel is in the bounds or not.

Below is a picture of my Material. I am new to materials and need some guidance on how to achieving making everything in the box effected by the post process and making the area dark.

Thanks

[PharosSentinel]

After some playing around I have been able to do the exact opposite I want but can not make it dark only in the boxed area.

[PharosSentinel]

I was able to achieve the desired result by doing the following in the picture below.

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I created Material Function to allow me to easily create a Box Mask to apply Post Process effects with in that can be seen from outside the box bounds.