Like so ?? Maybe via a shader trick. Using a texture with an marked area (not only one color but color "corection" red / 2.. so there are still some details): and comparing the color to get a "mask" while changing the hie/saturation for this part only (via mix color) like so (here with animated hue/sat) teh coloring…
I haven't made the geo yet, I'm still in the planning stage! If you have any suggestions for good geo I'd love to hear them. This is for an FPS map, roughly similar size to a typical COD map. I'm planning on making a modular building kit for it (it'll mostly be similar styled warehouse-like buildings, nothing too…