Documentation/Tutorial/Demo: https://youtu.be/37wE5ToTQi4
Instanced Interior Mapping and Dynamic Grunge is a Material for instanced fake window interiors with dynamic grunge.
It keeps all windows on the same plane mesh and uses the same material. It is customized via custom primitive data for everything from dirty edges, grungy middle, emissive amount, color, normals / fake refraction, roughness, room position/scale/rotation, curtain position/scale, curtain color/alpha , blur and many other features.
HDR textures available for better bloom. Supports both HDR and non HDR cubemaps as well as bump offset method for interior.
It also can be made to use texture arrays that can also switch the interior or curtain type via custom primitive data.
Post processing provided so that windows behave as expected in real world lighting values. They look correct in day and night automatically.
The benefit of this is keeping things on 1 mesh, no uv work to change, better for performance, draw calls, and instancing. Same material and same mesh to be instanced across many different windows.
This product supports Nanite for Unreal Engine 5.0+ and is enabled on the static mesh by default, but is not necessary.