Thanks for the feedback SBiegun. I’ll think about the lens flares but I do like them a bit. We play around with camera values like aperture to make it look more realistic and lens flares do happen. But I agree that many people dislike them, especially clients.
Having exposure enabled isn’t really an option if you go from the inside to the outside and back to the inside. Our eyes adjust. I tried it without but it doesn’t work for me. But you are right it shouldn’t be that visible. I should have cut out some of it.
About the master material: In ArchViz we don’t have grunge or wear. All of our textures are clean. This makes a large diffuse covering the whole object obsolete. So I only have AO and normals covering the entire object, eg a piece of furniture. Then I use detail diffuse, normals and masks which are tiling. I can have up to 3 layers of materials within the master materials. There is only one id per object usually which reduces draw calls. Draw calls are causing the most problems in big scenes.
You do know how to make master materials and instances? Otherwise check the epic tutorials. A master material is the same as a material but you use parameters for some textures and values. You can change those values in the material instance. You can have instances of instances which is very handy if you just want to change the color for example. It is a ‘must’ to use in any material library. I can go into a bit more detail if you want.