Thank you for your reply!
I think I might be slightly asking the wrong question.
I really would just want the location coordinates of that red mesh box extent outside of the material. I definitely have access to the overall object box coordinates, not sure how I would attempt to clip it to recieve just the red portion. Not sure if the approach is similar to what you have posted (I am new to Unreal 
). Additionally, there a lot of these objects and I guess another question is how to associate each object with its own red mesh coordinates when I am using the post process volume.