Raytrace, post processing and Photoshop tips: Inserting a photo background into your scene   Here we have a simple bathroom that has an overexposed exterior light Using a material ID mask(see other tutorial below this line) We are going to inject a photograph of the existing exterior. For the purpose of this tutorial I will be using Photoshop CC. Time to complete: 15-20 minutes. 1.Create a duplicate layer of your background and name it, for the purpose of this tut my n